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Stress redistribution and stress triaxiality effect on the fatigue life of notched Ni-based single crystal superalloy at 760℃ Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-13 Jundong Wang, Tianyu Liu, Leike Yang, Zhixun Wen, Zhufeng Yue, Qianzhu Mao
The multiaxial stress state caused by geometric discontinuities will result in significant differences in the fatigue performance compared to the uniaxial stress state. It is crucial importance to research the notch fatigue behaviors of nickel-based single crystal (Ni-SX) superalloys at high temperature. This study investigated the impact of stress redistribution and stress triaxiality on the fatigue
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Experimental study on mechanical properties and evolution of fracture failure of granite considering initial temperature damage and prefabricated fissure length Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-13 Chunxiao Li, Dejian Li, Bo Hu, Ruixue Du, Xiaolin Liu
With the increasing mining depth of deep mineral resources, the influence of high temperature on the fracture failure of surrounding rock with fissures becomes increasingly serious. To investigate the fracture mechanical properties and the evolutionary characteristics of fracture process of fissured rock experiencing initial temperature damage, the three-point bending experiment was conducted on the
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Prediction of fracture failure and fracture parameters for dam gallery concrete specimens of arbitrary size and age via boundary effect model and fracture extreme theory Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-12 Xiaofeng Gao, Mingli Ji, Qingbin Li, Mengxia Zhou, Cheng Yang, Zhihong Liu
Cracking-associated problems may occur in the construction and operation periods of dam galleries, necessitating attention to the fracture characteristics of gallery concrete. The fracture parameters of concrete exhibit size effects and also change with age. A correct evaluation of the cracking risk or crack stability of gallery structures at any given time requires a comprehensive understanding of
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Effect of cork powder concentration and service temperature on strength characteristics and failure modes of tubular adhesively bonded joints Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-12 Shamsheer Haider, Hassan Ejaz, A. Mubashar, Manzar Masud
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Experimental study on crack propagation characteristics of unconventional reservoir rocks Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-12 Zaiyong Wang, Haojie Lian, Weiguo Liang, Pengfei Wu, Wenda Li, Yongjun Yu, Dijie Zhu
This study investigates the fracture behaviour of three types of specimens (shale, sandstone, and coal), which are commonly found in unconventional reservoirs, based on mode Ⅰ single-edge notch beam (SENB) test. We employ the Digital Image Correlation technique to track the strain evolution and crack propagation paths of the three types of materials and compare their fracture characteristics. The experimental
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Discontinuous fracture behaviors and constitutive model of sandstone specimens containing non-parallel prefabricated fissures under uniaxial compression Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-11 Menghao Zheng, Yunpei Liang, Manfred Staat, Quangui Li, Jianbo Li
The deformation and damage laws of non-homogeneous irregular structural planes in rocks are the basis for studying the stability of rock engineering. To investigate the damage characteristics of rock containing non-parallel fissures, uniaxial compression tests and numerical simulations were conducted on sandstone specimens containing three non-parallel fissures inclined at 0°, 45° and 90° in this study
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Evaluation of effect of spheroidization heat treatment on mechanical properties via small punch test Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-11 Xun Wang, Yan Du, Lianyong Xu, Lei Zhao, Yongdian Han
Due to the long time high temperature thermal action, pearlite heat-resistant steel 15CrMo is prone to pearlite spheroidization, which reduces its strength and makes it difficult to meet the actual service requirements. Therefore, quantifying the effect of pearlite spheroidization is an important factor in evaluating the high temperature performance of 15CrMo steel. In this study, the mechanical properties
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Evaluation of fracture energy and durability properties of pavement concrete incorporating blends of durable and non-durable limestone Aggregates: RSM modelling and optimization Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-09 Ahmad Mansourian, Shahin Shabani, Kianoush Siamardi
Cement concrete pavements are the ground structures constructed with quasi-brittle materials which fail under fracture modes caused by traffic loading and environmental conditions. Practically, incorporating local aggregate resources is inevitable for the sustainable use of materials in construction. In this research study, a total of 15 concrete mixes with similar gradations, slump and air-content
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Support vector regression-assisted finite element method for mode I-II fatigue crack growth path prediction Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-08 Jianchun Yao, Jiawei Xiang
Most of failures in mechanical components in engineering are caused by fatigue crack growth (FCG), especially mode I-II cracks. Accurately and fast predict of crack growth paths of mode I-II in structures is important in academic research and engineering applications. Finite element method (FEM) simulation of FCG can be accurately performed for engineering applications. However, the commercial FEM
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Critical slowing down characteristics of acoustic emission for fracture instability of sandstone down-slope rock bridge under cyclic wetting and drying Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-08 Li Wan, Tong Jiang, Qi Wu, Jinyu Dong, Zangnan Yu
Down-slope rock bridge in slopes and dangerous rock masses are often affected by cyclic wetting and drying, leading to severe geological disasters. In order to investigate the deterioration mechanism, deformation failure mode and instability precursor information of sandstone down-slope rock bridge under different cyclic wetting and drying, uniaxial compression tests combined with acoustic emission
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Influence of different heat treatments on fracture behavior of rolling element bearing steels Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-07 Nikhil Londhe, Scott Hyde
Rolling element bearings (REB), one of the critical components of mechanical power transmissions, operate under high contact loads concentrated over small volumes of material. The damage caused by fatigue to REBs happens in two stages: the initiation of cracks and the propagation of cracks from areas of stress concentration. To select bearing steels for different applications, it is important to have
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Step-path failure mechanism and stability analysis of water-bearing rock slopes based on particle flow simulation Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-06 Jie Chen, Jue Tong, Yichao Rui, Yi Cui, Yuanyuan Pu, Junsheng Du, Derek B. Apel
Step-path failure is a typical damage mode of rock slope featuring intermittent joints. In order to investigate the effect of water-fracture interaction on the stepped failure, laboratory experiments of rock materials and numerical simulation of slopes with intermittent joints were conducted. At the laboratory scale, the influence of water-fracture interaction on the mechanical characteristics and
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Ductile fracture prediction of additively manufactured Ti-6Al-4 V alloy based on void growth and coalescence of a unit-cell model Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-05 Baisen Gao, Wei Huang, Shengnan Wang, Zhigang Liu, Xianmin Chen, Shaopu Su
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An investigation on fracture toughness predictions from mini-sized uniaxial tensile specimens with global and local approaches Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-05 Tairui Zhang, Xiandong Shang, Naixin Zhang, Kai Lu, Mingjiang Xie
This study provides investigations on whether the fracture toughness can be accurately predicted from mini-sized uniaxial tensile specimens with existing global and local approaches. The critical toughness model, based on classical fracture mechanics, and the energy release rate (ERR) model, based on damage mechanics, were used as the two representative global approaches. While the finite element simulated
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A new method for prediction of fatigue crack propagation life under variable amplitude spectrum loading Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-03 Mehmet F. Yaren, Ali O. Ayhan
This paper proposes a new method for predicting propagation lives for through-thickness cracks under variable amplitude mode-I spectrum fatigue loads. Only the crack opening, i.e., the increasing parts of the load cycles within spectrum profiles are considered for cycle counting and computing their stress ratios. Moreover, a cycle-by-cycle analysis is also performed throughout the spectrum to compute
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Efficient technique for evaluation of three-dimensional elastic–plastic fracture mechanics parameters based on equivalent distributed stress concept Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-02 Zwe Letyar Htut, Naoki Osawa, Satoyuki Tanaka, Masahiro Toyosada
This study proposes an efficient technique for the evaluation of the elastic–plastic fracture mechanics (EPFM) parameters of three-dimensional (3D) cracks based on the modified crack cohesive force (CCF) model. In the current method, the 3D crack’s EPFM parameters are analyzed by applying the pseudo crack face traction (CFT) to a two-dimensional (2D) center crack in an infinite plate. This pseudo traction
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Effect of loading rate on mode I fracture behavior of red sandstone: Insights from AE and DIC techniques Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-02 Chenxi Zhang, Diyuan Li, Aohui Zhou, Wenkai Ru, Quanqi Zhu, Jinyin Ma
The loading rate is an essential factor that influences the fracture characteristics and behavior of rock materials. In the study, a series of mode I fracture tests were performed on semi-circular bending (SCB) specimens of red sandstone under a range of static loading rates (0.005 mm/min–2 mm/min). The results showed that fracture toughness increases linearly with the logarithm of loading rates but
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Numerical study on dynamic cracking characteristic and mechanism of quasi-brittle materials under impulsive loading Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-02 Yong Niu, Xiaoping Zhou, Junwei Chen
This study focuses on investigating the dynamic cracking behaviors of quasi-brittle materials under impulsive loading using the extended non-ordinary state-based peridynamic (NOSB-PD) model. This extended model incorporates two stress-based failure criteria: Mohr-Coulomb and maximum tensile stress criteria, to represent shear and tensile fractures of quasi-brittle materials, respectively. By analyzing
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Role of precipitate-induced [formula omitted] twins on anisotropic fracture behavior in Mg-3Al-0.5Ce alloys Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-02 Prakash C. Gautam, Somjeet Biswas
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A thermodynamically consistent strain difference-based nonlocal damage mechanics approach for failure analysis of quasi-brittle materials Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-03-01 S. Sai Kumar, N. Muthu
The nonlocal integral approaches are established methods known for their effectiveness in dealing with the challenges of ill-posed behaviour and mesh sensitivity during the strain softening process, especially within classical continuum theories. The present work extends the strain difference-based nonlocal approach to continuum damage mechanics (CDM) theories for predicting the failure behaviour of
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Characterization of mode II delamination behaviour of poplar plywood and LVL Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-29 H. Hadiji, J. Serra, R. Curti, D. Gebrehiwot, B. Castanié
The aim of this work was to characterize the interlaminar fracture toughness of poplar laminate veneer lumbers (LVL) under mode II loading. To this end, the Four-point End Notched Flexure test (4ENF) was chosen, and crack propagation was continuously monitored during the test using a stereo-correlation set-up. The R-curve was then obtained by a compliance calibration method, expressing the evolution
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Study on fracture propagation behavior of deep high-temperature shale gas based on the modified MERR criterion Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-28 Yu Suo, Yan-Jie Zhao, Xiao-Fei Fu, Wen-Yuan He, Zhe-Jun Pan
The continuous increase in energy demand propels the gradual shift of shale gas exploration from shallow to deep reservoirs. Exploring and developing deep shale gas resources (situated at depths exceeding 3500 m) emerges as a crucial focus in China’s unconventional resource exploration and development. However, the high-temperature characteristics of in-situ reservoirs pose challenges in understanding
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Microstructural characterization and mechanical behaviour of laser powder Bed Fusion stainless steel 316L Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-28 Davide Crisafulli, Stanislava Fintová, Dario Santonocito, Danilo D'Andrea
Laser Powder Bed Fusion (L-PBF) is a highly precise and customizable additive manufacturing (AM) technique that uses a high-energy laser to selectively melt and fuse powdered material into a three-dimensional object. However, depending on the process parameters, the final components may have potential flaws that can affect their quality and mechanical properties, due to porosity, melting and incomplete
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The effect of normal compressive stresses on the fracture behavior of mode II crack under compression and shear loads Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-27 Peng Ying, Yu Ying, Ruihe Zhou, Zheming Zhu, Lian He, Kewei Yu, Lei Zhou, Xibin Li
For the purpose of investigating the influence of normal compressive stresses on the fracture behavior in model II cracks, this study used a single cleavage (SC) specimen, which was made of the sandstone. Shear experiments under different normal compressive stresses were conducted by using a rock deformation test system. So as to study the mechanism of crack propagation under different compressive
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Fracture behavior of double edge notch AlSi10Mg alloy fabricated by laser powder bed fusion Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-27 Mohammad Reza Khosravani, Peter Frohn-Sörensen, Bernd Engel, Tamara Reinicke
In the present study, the fracture behavior of additively manufactured (AM) metal parts has been investigated. To this aim, double edge notch tension (DENT) specimens have been printed using AlSi10Mg alloy based on the laser powder bed fusion (PBF) technique. Particularly, DENT specimens have been fabricated with three different ligament lengths and three different printing directions for each ligament
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Creep damage laws for bonded joints under pure mode I loading Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-27 R.F.M. Couto, M.F.S.F. de Moura, A.G. Magalhães, R.D.F. Moreira
Nowadays, adhesively bonded joints constitute an emergent area, being applied in several industries, especially in the aviation sector. Research has been developed on the analysis of the mechanical behaviour of bonded joints, while establishing fracture characterisation in pure modes I and II, and in mixed-mode I + II. Despite of the significant developments in analysing of bonded joints under quasi-static
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Fracture behavior and acoustic emission characteristics of layered sandstone with a bedding-parallel crack Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-27 Kewei Liu, Liansong Zou, Tengfei Guo, Can Guo, Jiacai Yang, Yi Zhang
Bedding planes and cracks are widely found in natural rock mass, exerting a substantial effect on the stability and security of layered rock structures. Cracked straight-through Brazilian disc (CSTBD) tests were conducted to analyze the fracture mechanics of layered sandstone. Meanwhile, acoustic emission (AE) monitoring system was applied to reveal AE characteristics. Test results indicate that bedding
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State-of-the-art review on meshless methods in the application of crack problems Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-27 Mengqiu Zhang, Ahmad Razin Zainal Abidin, Cher Siang Tan
Meshless or meshfree methods (MMs) are practical and excellent numerical techniques for solving crack problems. With the inherent limitations of mesh-based methods such as the finite element method (FEM) in modeling cracks, MMs have captivated the attention of researchers worldwide because of their conspicuous merits, including mesh independence and higher-order continuity. However, the most recent
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An numerical investigation of the three dimensional multi-level force chain network of the sample with a single fissure under uniaxial compression Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-24 Tao Zhang, Liyuan Yu, Linjian Ma, Yizhong Tan, Wei Li, Doudou Fan, Xianzhen Mi
A novel three-dimensional grain-based model based on Particle Flow Code is proposed. Within this model, both quantitative calculations and multi-level classifications of force chain networks are achieved. A batch of numerical samples with a single pre-existing fissure with different inclination angle is constructed and then applied to the uniaxial compression. The result shows that the general force
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Estimation of multiple cracks interaction and its effect on stress intensity factors under mixed load by artificial neural networks Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-24 Amirhossein Parsania, Erfan Kakavand, Seyed Amirhossein Hosseini, Alireza Parsania
One of the goals of fracture mechanics in the analysis of problems involving cracks is to investigate crack growth and propagation. Each crack grows and propagates in the environment based on its geometry and loading conditions, which can occur under pure mode or a combination of modes. The growth and propagation pattern of the crack in these conditions aligns with the fracture mode. In the presence
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Phase-field simulation of dual-crack system hydrogen embrittlement in metallic materials Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-24 Yong Zhang, Pengkai Xu, Wei Ding, Huanfei Jia, Wei Ouyang, Fei Cheng
Hydrogen embrittlement is a severe form of failure in metallic materials, where hydrogen ions significantly reduce the load-bearing capacity of the material. The presence of hydrogen and multiple cracks complicates the fracture process, rendering fracture prediction considerably more challenging. In this work, we employ the standard phase-field damage model to investigate the propagation of dual cracks
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Experimental characterization on fracture behavior of UHPMC under small-scale sample tensile testing: Acoustic emission monitoring and digital image correlation Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-24 Yubo Jiao, Yaojia Chen, Hua Yang, Caiqin Wang
Manufactured sand (MS) was used to partially replace the traditional quartz sand (QS) to prepare a novel ultra-high-performance manufactured sand concrete (UHPMC). To better understand the fracture damage mechanism of UHPMC, small-scale sample tensile tests were conducted to investigate the tensile behavior of three types of UHPMC (low strain hardening, low strain softening and high strain softening)
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Experimental study on mechanical behavior, AE response and energy evolution of fissure-filled sandstone from mine roadway under conventional triaxial compression Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-24 Ke-Sheng Li, Yi-Quan Luan, Jin-Peng Zhang, Chuan-Xiao Liu
Engineering reliability exhibit sophistication and unpredictability for mining from all the regions, largely due to the random combinatorial morphology of natural discontinuities associated with the ubiquitous fissures in the rock formation. This study determined the effects of intersecting fissure angle (none, 0°, 30°, 45°, 60°, and 90°) and confining pressures (4, 8, 12, and 16 MPa) on its mechanical
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Damage and fracture initiation under shear and compression stress states in the aluminum alloy EN AW6082-T6 Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-23 Moritz Zistl, Michael Brünig, Steffen Gerke
The present paper deals with the experimental and numerical analysis of damage and fracture behavior of ductile metals under combined compression and shear loading. Biaxial experiments with the H-specimen using a pneumatic downholder during compression loading and corresponding numerical simulations are discussed. A thermodynamically consistent anisotropic continuum damage model using damage strains
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Failure of trabecular bone: XFEM modelling of multiple crack growth Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-23 Aleksandr Shalimov, Mikhail Tashkinov, Vadim V. Silberschmidt
Trabecular bone plays an important role in structural integrity of bone tissues. Its complex microstructure characterised by high porosity and intricate composition with multiple trabeculae is a challenge for analysis of fracture initiation and propagation in it. This work investigates mechanical behaviour and failure of representative volume elements (RVEs) of porous structure of trabecular bone using
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“Subvolume Splitting” DVC applied for accurate discontinuous deformation measurement and fracture parameter extraction Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-23 Xuanhao Zhang, Bing Pan
As a powerful experimental tool for quantifying internal full-field mechanical response, digital volume correlation (DVC) has been increasingly used for extracting crucial fracture parameters. Nevertheless, due to the limitations of its regularly-used shape functions in describing discontinuous deformation, routine subvolume-based DVC encounters challenges in accurately capturing displacement maps
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DIC to evaluate a model composite system cracking due to CTE mismatch Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-22 Igor Paganotto Zago, Rafael Vargas, Vinicius Fiocco Sciuti, Rodrigo Bresciani Canto, Ricardo Afonso Angélico
Coefficient of thermal expansion (CTE) mismatch in composites under temperature variation can lead to the system cracking. In this study, Digital Image Correlation (DIC) was used to investigate this phenomenon in a model composite system (MCS) composed of a single cylindrical inclusion into a ceramic mortar matrix. Temperature variation experiments assisted by DIC were conducted to evaluate the CTE
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Non-constant evolution of mixed mode fracture process zone in heat-treated salt rock during the whole loading Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-22 Xufeng Liang, Gan Feng, Tao Meng, Guanghui Zhao, Zhixia Wang, Pengtao Liu, Reza Taherdangkoo
Exploring the evolution of the fracture process zone (FPZ) in mixed fracture within salt rock is vital for enhancing our comprehension of salt rock fracture properties and assessing the long-term stability of energy reservoirs. Prior research has identified the existence of constant evolution within the FPZ, a topic that has sparked debate. For this purpose, we acquired data on the evolution of the
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Modification of nominal strength scaling laws to pseudo-ductility Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-20 A. Subramani, P. Maimí, J. Costa
We investigate the influence pseudo-ductility has on the notched strength and size-effect behaviour of typical notched specimens of quasi-isotropic pseudo-ductile composite materials. Our previous findings reveal that pseudo-ductility enhances translaminar toughness and nominal strength recovery but can negatively affect specimens below a critical notch size. The traditional Bažant Size Effect Law
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Effect of silica fume on fracture analysis, durability performance and embodied carbon of fiber-reinforced self-healed concrete Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-20 Abdul Salam Buller, Fahad-ul-Rehman Abro, Mohsin Ali, Tariq Ali, Naraindas Bheel
Nowadays concrete industry is trying to develop sustainable and energy efficient materials. One of the techniques is to develop crack free concrete. Therefore, this study focusses on the use of different supplementary materials like silica fume as substitute of cement to characterize the self-healing capacity of fiber-reinforced concrete in order to produce crack free concrete. The employed concrete
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Failure characteristics of tunnel under the true triaxial condition: Role of a prefabricated flaw Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-20 Jianing Li, Jianhua Hu, Yusong Zhao, Zhou Zhao, Yanliang Chen, Binglei Li
Flaws such as faults, joints, and bedding planes often exist in natural rock masses, which pose significant safety hazards for tunnel excavation. We conducted a series of experimental tests to analyse the effect of the different flaw occurrences (intact, open-flaw, and filled-flaw) on the rockburst mode around a horseshoe-shaped tunnel. The destruction was monitored by continuous photo imaging (captured
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Experimental investigation on mechanical and damage properties of single fractured coal subjected to water pressure and triaxial compression Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-18 Ruipeng Qian, Guorui Feng, Xiaoli Liu, Bo Yu, Qing Ma, Shuyuan Zeng, Nan Hu, Huale Geng
Underground water reservoir technology facilitates the harmonization of coal resource development and water resource conservation. The main structure of the underground water reservoir dam comprises coal pillars, whose stability is influenced by the combined effects of water pressure, stress, and fractures. In this study, triaxial compression tests were conducted on single fractured coal samples with
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Microscopic fracture evolution and propagation mechanism of coal with high coal burst liability Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-17 Xiangshang Li, Qi Wang, Kunbo Wu, Jiamin Wang, Qingxin Qi
The key to preventing and controlling rockbursts is to clarify the microscopic fracture evolution law and expansion mechanism of coal with high coal burst liability. Meanwhile, there is a black box problem in the process of internal crack propagation in coal under external loads, making it difficult to directly observe the coal's internal crack network. Consequently, the in-situ loading scanning comprehensive
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A comparative study on characterizing the fracture toughness variations in thick-wall hydrogenation reactor welded joint by spherical indentation tests Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-16 Zhiqiang Ge, Jianping Zhao, Xin Ma, Tao Dai
This study provides an investigation on the existing models in predicting the fracture toughness distributions in thick-wall hydrogenation reactor welded joint from SITs. Three criterions, namely the critical stress, the critical strain, and the critical damage variable, were used in determining the critical indentation depth in the IEF model, together with the ERR model. Experimental results proved
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A novel thermo-mechanical local damage model for quasi-brittle fracture analysis Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-16 Manh Van Pham, Minh Ngoc Nguyen, Tinh Quoc Bui
This paper is devoted to numerical investigation of quasi-brittle fracture under thermal-elastic loading condition using a novel thermal-mechanical local damage model associated with the enhanced bi-energy norm based equivalent strain. In contrast to the non-local or gradient-enhanced damage models, a local damage counterpart generally requires less computational effort. The common mesh-dependent issue
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Higher-order asymptotic crack-tip fields in simplified strain gradient elasticity Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-16 Y, u, r, y, , S, o, l, y, a, e, v
Explicit representation for the higher-order in-plane crack-tip fields is derived using Papkovich–Neuber stress functions within the framework of simplified strain gradient elasticity (SGE). In the considered theory, strain energy density depends on both the infinitesimal strain tensor and its spatial gradient. The constitutive equations of simplified SGE contain an additional length scale parameter
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Dynamic crack propagation in variable stiffness composite laminates under thermal shock Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-15 Alireza Amiri Esfarjani, Mohammad Bagher Nazari, Seyed Hadi Bayat
This article addresses a study about the dynamic crack propagation in Variable Stiffness Composite Laminates (VSCLs) under non-classic thermal shock considering Lord-Shulman's (LS) theory. A domain-independent interaction integral is proposed to compute Stress Intensity Factors (SIFs) for dynamically moving cracks in VSCLs, which includes some extra terms to guarantee the domain independency in the
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A novel and simple variationally-consistent phase-field cohesive zone model for mixed-mode fracture Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-15 Pei-Liang Bian, Hai Qing, Tiantang Yu, Siegfried Schmauder
In rock-like materials, mode I and II fracture toughness are distinctive while the compressive strength is much greater than the tensile strength. Besides, mixed-mode fractures instead of pure mode I or II fractures occur under complicated load cases in those materials. Therefore, to capture the mixed-mode cracking process, we developed a mixed-mode phase-field cohesive zone model based on the unified
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Effect of SCB specimen size on mode I fracture parameters of asphalt concrete at low and intermediate temperatures Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-14 Sadjad Pirmohammad, Ramin Momeni, Siyab Houshmandi Khanghahi
This research investigates the impact of specimen size on the fracture properties of asphalt concrete. Fracture experiments were conducted on semi-circular bend (SCB) specimens with three different radii of 75 mm, 43 mm, and 32 mm at low and intermediate temperatures (−30 °C, −20 °C, and 10 °C) under pure mode I loading. The findings indicate that an increase in specimen size leads to an improvement
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Experimental and numerical investigations of crack arrest toughness of a shipbuilding steel with a new scaled-down specimen Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-13 Chunyang Xue, Xinchun Shang, Ling Yan, Peng Zhang, Dongsheng Liu, Xuechong Ren
A new scaled-down dovetail crack arrest (DCA) specimen (thickness = 20 mm, width = 200 mm) with a temperature gradient along the crack propagation direction was designed to evaluate the crack arrest toughness of EH47 shipbuilding steel at different temperatures. The results showed that the scaled-down DCA specimen can be used to evaluate the crack arrest toughness at a wider temperature range and with
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A dynamic damage constitutive model and three-dimensional internal crack propagation of rock-like materials in bond-based peridynamic Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-11 Gang Sun, Junxiang Wang, Song Tang, Zhengru Zhang, Lianjun Guo
The original bond-based peridynamic model addresses brittle fracture rather than progressive fracture. It also does not account for the impact of strain rate on bond strength and fails to incorporate the impact of internal length on non-local long-range forces. As a result, it is inadequate for simulating the dynamic failure of rock-like materials under impact loading. To address these limitations
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Investigating failure modes and Micro-Crack classification in Mao phyllite under notched Semi-Circular bend testing Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-10 Shu Wang, Chuan He, Guowen Xu, Rongmin Bai, Yueheng Shu, Jun Wang, Jianhong Yue, Weibo Zhang
To understand the fracture behaviors and failure process in rock strata with bedding planes, this study presents a comprehensive investigation into the failure modes and micro-crack classification of Mao phyllite under Notched Semi-Circular Bend (NSCB) testing. The research combines rock experiments with Acoustic Emission (AE) detection and numerical simulations to gain insights into the behavior of
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Effect of crack size, thickness and span on the transverse mode I fracture characteristics of laminated flattened-bamboo lumber Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-09 Xin Xue, Haitao Li, Yue Chen, Zixian Feng, Sarah Mohrmann, Conggan Yuan, Dongdong Wei, Wei Xu, Ottavia Corbi
To study the fracture characteristics of laminated flattened-bamboo lumber (LFBL), a transverse mode I fracture test was carried out on a single-edge notched (SEN) specimen. The failure of the specimen was analyzed at the macroscopic and microscopic levels. According to the analysis of P-CMOD curves, it was found that the entire fracture process could be divided into a linear stage, a softening stage
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A discrete element study of the fracture propagation of rock-like materials under directional sleeve fracturing Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-09 Jinming Han, Shanchao Hu, Zhihao Gao, Junhong Huang, Yafei Cheng, Shihao Guo, Lei Yang
The frequent occurrence of rockburst accidents caused by the fracture of hard roof strata with the increase in mining depth has made it necessary to investigate methods for preventing and controlling such dynamic disasters. To reveal the characteristics of rock fracture under sleeve fracturing, the experiments for expansion pressure measurement of the sleeve and the experiments for single-hole sleeve
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Probabilistic fatigue evaluation of notched specimens considering small sample properties under multiaxial loading Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-09 Yingbao He, Jianhui Liu, Jumei Lu, Jie Wang, Ruicheng Feng, Junqiang Ren
Probabilistic fatigue evaluation is the key to ensure the service integrity of large-sized mechanical equipment, but in practical engineering, the probabilistic fatigue models coupled with multiaxial stress conditions and small sample information characteristics are still insufficient. Accordingly, the virtual subsample augmentation method is effectively coupled with the improved Bootstrap method to
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Fracture mechanics analysis of functionally graded materials by an efficient and accurate meshless method Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-07 Nana Pu, Yifei Zhang, Wentao Ma
In this work, an efficient and accurate meshfree method, named the two-level nesting smoothed extended meshless method (S-XMM-N), is developed for simulating the static and dynamic fracture behaviors of two-dimensional (2D) functionally graded materials (FGMs). To accurately capture the displacement discontinuity along the crack face and the stress singularities at the crack tips in FGMs, we improve
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Numerical solution of stress intensity factor in an infinite plate containing parallel double cracks under compression and shear Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-07 Fengjin Zhu, Sheng Shi, Ziwei Ge, Danyi Shen
The Fredholm integral equation method and the superposition principle are applied to solve the equations for the problems of collinear double cracks and non-collinear parallel double cracks in an infinite plate under compression and shear. The numerical solutions of the proposed method are verified by the analytical solutions of the elliptic integral method. Then the effects of geometrical position
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Experimental study on the fracture characteristics of sandstone under asymmetric load by using a semi-circular bending specimen Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-05 Wenyu Zhang, Wen Hua, Mao Zhou, Fengfei He, Yaozhong Xu, Shiming Dong
The asymmetric semi-circular bending (ASCB) specimens have garnered attention from researchers due to their straightforward fabrication process and convenient experimental loading, and have been extensively employed for investigating the fracture behavior of building materials. The mixed mode I-II fracture mechanical behavior of sandstone under asymmetric loading was studied by using ASCB specimens
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Redefined three-dimensional J-integral as finite strain elastic-plastic crack parameter (Energy release rate and contribution of weakly singular terms) Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-03 Hiroshi Okada, Takahiko Gouda, Koichiro Arai
A rigorous three-dimensional J-integral in a domain integral representation is derived and applied to elastic–plastic crack propagation problems. It is called the “redefined J-integral” in this paper. The derivation is based on the power balance of a solid. The difference between the powers of external force and strain energy stored in the solid is the energy release rate at the crack tip while the
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Effect of sub-zero temperature on dynamic mode II fracture properties of saturated porous rocks Journal of Theoretical and Applied Mechanics (IF 5.3) Pub Date : 2024-02-03 Ying Xu, Jiye Liu, Songshan Lin, Ran Xu, Wei Yao
Investigating mode II (shear) fracture properties in alpine and arctic rock engineering is crucial. However, the effects of sub-zero temperatures on these fracture parameters of rocks remain unexplored. Thus, short core in compression (SCC) specimens are fabricated to investigate dynamic mode II fracture parameters of porous white sandstone (WS) across varying ambient temperatures (−55 °C, −40 °C,