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Measuring coarse grain deformation by digital image correlation Strain (IF 1.313) Pub Date : 2021-01-13 Claire Silvani; Julien Réthoré; Sylvie Nicaise
This work presents results from oedometric compression of coarse granular material. Coarse granular media exhibit significant deformations making it complicated to predict the settlement of structures. In this paper, a measurement technique was developed for the analysis of two‐dimensional (2‐D) images of a deforming coarse granular medium to investigate its deformation. This was achieved by realising
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Quantitative evaluation of cumulative plastic damage for ferromagnetic steel under low cycle fatigue based on magnetic memory method Strain (IF 1.313) Pub Date : 2021-01-12 Sanqing Su; Xiaoping Ma; Wei Wang; Yiyi Yang; Jingyu Hu
Cumulative plastic damage caused during the low cycle fatigue (LCF) regime may seriously undermine the safety of the steel members and even lead to serious industrial accidents. Magnetic memory method (MMM), as a novel nondestructive testing technology, has been developed to evaluate the fatigue damage for the ferromagnetic material, but there is the lack of a quantitative description exists for the
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Constitutive equation determination and dynamic numerical modelling of the compression deformation of concrete Strain (IF 1.313) Pub Date : 2021-01-07 Semih Berk Seven; M. Alper Çankaya; Çetin Uysal; Alper Tasdemirci; Selçuk Saatçi; Mustafa Güden
The dynamic compression deformation of an in‐house cast concrete (average aggregate size of 2–2.5 mm) was modelled using the finite element (FE), element‐free Galerkin (EFG) and smooth particle Galerkin (SPG) methods to determine their capabilities of capturing the dynamic deformation. The numerical results were validated with those of the experimental split Hopkinson pressure bar tests. Both EFG and
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Simultaneous fluid and solid density measurements in swelling clay using X‐ray microtomography and 3D particle tracking Strain (IF 1.313) Pub Date : 2020-11-22 Fabien Bernachy‐Barbe; Kevin Alvarado
In order to demonstrate the safety of engineered barriers for radwaste geological repositories, rich characterisations of bentonite hydro‐mechanical behaviour are essential. X‐ray computed tomography was used as the single input to measure both the full displacement field and water content in a heterogeneous bentonite sample resaturated in quasi‐isochoric conditions. Since large texture changes do
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Issue Information Strain (IF 1.313) Pub Date : 2020-11-20
No abstract is available for this article.
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Quantification of evolving moisture profiles in concrete samples subjected to temperature gradient by means of rapid neutron tomography: Influence of boundary conditions, hygro‐thermal loading history and spalling mitigation additives Strain (IF 1.313) Pub Date : 2020-10-11 A. Tengattini; S. Dal Pont; H. Cheikh Sleiman; F. Kisuka; M. Briffaut
Concrete has a tendency to spall, that is, to eject layers when subjected to high temperatures. This is an erratic phenomenon, and our understanding of the underlying physical process is still limited. A driving process is moisture transfer, whose experimental investigation has so far mostly been limited to macroscopic or point‐wise observations, limiting both our understanding and the validation of
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Investigation of the 2D assumption in the image‐based inertial impact test Strain (IF 1.313) Pub Date : 2020-10-06 Jared Van Blitterswyk; Lloyd Fletcher; Fabrice Pierron
The image‐based inertial impact (IBII) test has shown promise for measuring properties of composites at strain rates where existing test methods become unreliable due to inertial effects (> 102 s−1). Typically, the IBII tests are performed with a single camera, and therefore, to use surface measurements for material property identification, it is necessary to assume that the test is two‐dimensional
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Issue Information Strain (IF 1.313) Pub Date : 2020-09-27
No abstract is available for this article.
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Towards Material Testing 2.0. A review of test design for identification of constitutive parameters from full‐field measurements Strain (IF 1.313) Pub Date : 2020-09-23 F. Pierron; M. Grédiac
Full‐field optical measurements like digital image correlation or the grid method have brought a paradigm shift in the experimental mechanics community. While inverse identification techniques like finite element model updating or the virtual fields method have been the object of significant developments, current test methods, inherited from the age of strain gauges or linear variable displacement
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Experimental study of dry stone masonry walls using digital reflection photoelasticity Strain (IF 1.313) Pub Date : 2020-09-08 Pankaj Kumar; M.P. Hariprasad; Arun Menon; K. Ramesh
Response of dry stack stone masonry walls under mechanical loading is complex and difficult to determine, mainly due to heterogeneous and discrete nature of the components of the stone wall. In this paper, reflection photoelasticity is used on scaled down models of stone masonry wall under uniaxial compression. Two walls are tested, and the methods to obtain near perfect dry stack masonry for reflection
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Advances in analysis of total uncertainties in a semi‐invasive residual stress measurement method Strain (IF 1.313) Pub Date : 2020-08-03 Sayeed Hossain; Gang Zheng; Devkumar Goudar
The ability to characterise residual stress distribution accurately and over different length scales, particularly deep into an engineering part, plays a significant role in assessing structural integrity. Two most commonly used techniques to measure residual stress fields deep into engineering components include neutron diffraction (ND) and deep‐hole drilling (DHD). As the measurements depend on several
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Issue Information Strain (IF 1.313) Pub Date : 2020-07-09
No abstract is available for this article.
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Validation of the photomechanical spalling test in the case of non‐linear dynamic response: Application to a granite rock Strain (IF 1.313) Pub Date : 2020-07-07 Bratislav Lukić; Dominique Saletti; Pascal Forquin
In this paper, the use of the virtual fields method for the identification of a strongly asymmetric compression–tension response of rock‐like materials under dynamic tensile loading is investigated. The photomechanical spalling set‐up is used, which induces an indirect tensile load in a non‐balanced sample, and the inertial component of the test is directly related to the measured dynamic stress with
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On the identification of cohesive zone model for curved crack in mortar Strain (IF 1.313) Pub Date : 2020-07-06 R. Vargas; A. Tsitova; F. Bernachy‐Barbe; B. Bary; R. B. Canto; F. Hild
This paper proposes an approach to defining the path of a curved crack in a single‐edge notched specimen with gray level residuals extracted from digital image correlation, followed by the calibration of the parameters of a cohesive zone model. Only the experimental force is used in the cost function minimized via finite element model updating. The displacement and gray level residual fields allow
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Tensile deformation behaviour of a dissimilar metal weldment of P91 and 347H steels Strain (IF 1.313) Pub Date : 2020-06-29 Sajedur R. Akanda; Robert W. Wheeler; Kyle A. Rozman; Jessica Rider; Ömer N. Doğan; Marcus L. Young; Jeffrey A. Hawk
Deformation of a weldment is governed by the mechanical properties of its base metals and fusion zone. In a weldment, the base metals and fusion zone exhibit changing microstructural features with various phases present along the weldment. Specifically, the heat affected zone of a base metal exhibits a heterogeneous microstructure generated during weld thermal cycles and by post‐weld heat treatment
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The particle image tracking technique: An accurate optical method for measuring individual kinematics of rigid particles Strain (IF 1.313) Pub Date : 2020-06-29 Vincent Richefeu; Gaël Combe
We present a new approach to assess the two‐dimensional motion of rigid bodies in granular materials. Although it was adapted from digital image correlation technique, the heart of the presented technique relies on specific treatments related to the discrete nature of grain‐displacement fields. The code called Tracker has been developed to process the digital images and measure the in‐plane displacement
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Effect of impact velocity and impact angle on residual stress fields caused by foreign object damage Strain (IF 1.313) Pub Date : 2020-06-25 Hisao Matsunaga
In order to study the residual stress induced by foreign object damage (FOD), the distribution of residual stress caused by the impact of a hard spherical body was measured via the sin2ψ technique, using synchrotron X‐ray. A steel sphere was impacted onto a flat surface of a Ti‐6Al‐4V alloy from an angle of either 90° or 45°, at a velocity of 180 m/s. The same sphere was also quasi‐statically pressed
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Range‐expansion technology and fatigue performance study on the self‐sensing steel strand with an embedded fibre Bragg grating sensor Strain (IF 1.313) Pub Date : 2020-06-12 H.Y. Qin; Q.X. Shen; W.X. Zhu; H.L. Zhang
For the protection of a fragile optical fibre with a fibre Bragg grating (FBG) sensor, the encapsulating method of embedding the FBG sensor in a longitudinal groove set in the central wire of the steel strand is presented. According to the theoretical analysis of the strain transfer and sensing capacity between the embedded FBG sensor and substrate, the requirements for the cross‐sectional size of
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Experimental methodology on the serviceability behaviour of reinforced ultra‐high performance fibre reinforced concrete tensile elements Strain (IF 1.313) Pub Date : 2020-06-03 Majid Khorami; Juan Navarro‐Gregori; Pedro Serna
Design codes include serviceability limit state (SLS) provisions for stress, crack, and deflection control in concrete structures, which may limit the structural design. When drawing on reinforced ultra‐high performance fibre‐reinforced concrete (R‐UHPFRC), the process of cracking differs significantly from traditional concretes. Thus, it remains unclear whether the traditional provisions are applicable
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A novel model for determining tensile properties and hardness of steels by spherical indentations Strain (IF 1.313) Pub Date : 2020-06-03 Hui Chen; Li‐xun Cai; Chen Bao
An energy‐based spherical indentation (ESI) model according to equivalent energy principle is developed to determine the stress–strain relation, tensile strength and hardness of steels. Several parameters in the model are determined with finite element analysis (FEA). For a wide range of homogeneous and isotropic materials in power stress–strain law, a large number of FEA calculations are carried out
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Combined experimental–numerical study on residual stresses induced by a single impact as elementary process of mechanical peening Strain (IF 1.313) Pub Date : 2020-05-13 Paul Sandmann, Marc‐André Nielsen, Sören Keller, Emad Maawad, Peter Staron, Benjamin Klusemann
Peening processes can be used as a fatigue enhancement treatment for metallic structures by locally introducing compressive residual stresses. A combined experimental–numerical study on a single‐impact process with a drop tower on the aluminium alloy AA5754, representing the elementary process of mechanical peening, has been performed to investigate different impact parameters on the residual stress
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Issue Information Strain (IF 1.313) Pub Date : 2020-05-05
No abstract is available for this article.
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Shrinkage cracking of unsaturated fine soils: New experimental device and measurement techniques Strain (IF 1.313) Pub Date : 2020-04-25 Ahmad El Hajjar; Tariq Ouahbi; Joanna Eid; Mahdia Hattab; Said Taibi
Clay fine soils are characterised by an ability to change volume when subjected to suction. Soil cracking due to desiccation is a phenomenon of great importance in the environmental geotechnical engineering domain. Aiming to understand shrinkage mechanism, and conditions that lead to appearance of drying cracks, a new experimental testing coupled device digital image correlation‐ clay ring test (DIC‐CRT)
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Displacement measurement of concrete bridges by the sampling Moiré method based on phase analysis of repeated pattern Strain (IF 1.313) Pub Date : 2020-04-22 S. Ri; Q. Wang; H. Tsuda; H. Shirasaki; K. Kuribayashi
Measuring accurate deformation distribution of large‐scale structures inexpensively and efficiently is a crucial challenge of structural health monitoring. Phase‐based imaging technique has great potential for accurate and robust multipoint displacement measurement in the field. In this study, the sampling Moiré method—one of the promising optical techniques—was applied to the displacement measurement
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Low‐cost digital image correlation and strain measurement for geotechnical applications Strain (IF 1.313) Pub Date : 2020-04-20 G. N. Eichhorn; A. Bowman; S. K. Haigh; S. Stanier
Particle image velocimetry (PIV), or digital image correlation (DIC), is a widely used technique to measure soil displacements and strains in small‐scale geotechnical models. Arrays of single‐board computers (SBCs) produced by Raspberry Pi, and their associated 8‐MP cameras, are being used at the University of Cambridge to capture the images required for DIC analysis. This alternative to more expensive
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Validation of finite‐element models using full‐field experimental data: Levelling finite‐element analysis data through a digital image correlation engine Strain (IF 1.313) Pub Date : 2020-04-20 Pascal Lava, Elizabeth M. C. Jones, Lukas Wittevrongel, Fabrice Pierron
Full‐field data from digital image correlation (DIC) provide rich information for finite‐element analysis (FEA) validation. However, there are several inherent inconsistencies between FEA and DIC data that must be rectified before meaningful, quantitative comparisons can be made, including strain formulations, coordinate systems, data locations, strain calculation algorithms, spatial resolutions and
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Longitudinal restraining devices for the evaluation of structural behaviour of cement‐based materials: The past, present and prospective trends Strain (IF 1.313) Pub Date : 2020-04-16 Fragkoulis Kanavaris, Miguel Azenha, Dirk Schlicke, Konstantin Kovler
The problem of thermal and shrinkage cracking in concrete has been long recognised by researchers and engineers as it can jeopardise the intended serviceability of a concrete structure. This has led researchers to develop testing devices which aim to simulate the behaviour of concrete under restrained deformations. Such devices are discerned in passive and active, depending on how concrete's movement
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Subpixel precision of crack lip movements by Heaviside‐based digital image correlation for a mixed‐mode fracture Strain (IF 1.313) Pub Date : 2020-04-15 Stephen Hedan; Valéry Valle; Philippe Cosenza
This study reports on the Heaviside‐based digital image correlation (H‐DIC) procedure and its application in fracture analysis. This improved DIC procedure was proposed to solve the uncertainty problems at the vicinity of the crack and to evaluate the opening and shear movements of crack lips and the orientations of cracks in the subset. Some tests were conducted to demonstrate the performance of the
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Three‐dimensional physics‐based registration of pelvic system using 2D dynamic magnetic resonance imaging slices Strain (IF 1.313) Pub Date : 2020-04-15 H. Courtecuisse, Z. Jiang, O. Mayeur, J. F. Witz, P. Lecomte‐Grosbras, M. Cosson, M. Brieu, S. Cotin
This paper introduces a method for dynamic 3D registration of female pelvic organs using 2D dynamic magnetic‐resonance images (MRIs). The aim is to provide a better knowledge and understanding of pathologies such as prolapsus or abnormal mobility of tissues. 2D dynamic MRI sequences are commonly used in nowadays clinical routines in order to evaluate the dynamic of organs, but due to the limited view
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X‐ray tomographic observations of microcracking patterns in fibre‐reinforced mortar during tension stiffening tests Strain (IF 1.313) Pub Date : 2020-04-13 Nicolas Ducoulombier; Camille Chateau; Michel Bornert; Jean‐François Caron; Patrick Aimedieu; Timm Weitkamp; Jonathan Perrin; Andrew King; Mario Scheel
For the last decades, new reparation or fabrication processes have been studied to replace traditional rebar by roving of different mineral or organic fibres to avoid corrosion issues. Such materials refer to the family of cementitious composite. Their tensile strength would directly depend on the proportion of reinforcement and strongly on the interfacial mechanical properties between fibres and cementitious
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High‐speed, two‐dimensional digital image correlation algorithm using heterogeneous (CPU‐GPU) framework Strain (IF 1.313) Pub Date : 2020-04-13 Mullai Thiagu, Sankara J. Subramanian, Rupesh Nasre
Two‐dimensional digital image correlation (2D‐DIC) is an experimental technique used to measure in‐plane displacement of a test specimen. Real‐time measurement of full‐field displacement data is challenging due to enormous computational load of the algorithm. In order to improve the computational speed, the focus of recent research works has been on the approach of parallelization across subsets within
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Measurement of large, discontinuous displacement from digital images Strain (IF 1.313) Pub Date : 2020-04-04 Zhilei Luo, Xu Hu, Linlin Wang, Yangxiao Lu
One main limitation of conventional digital image correlation (DIC) methods is their incapacity to treat with large, discontinuous displacements. This paper seeks to resolve this issue using a variational method. Specifically, the objective function is written in a form of L1‐norm instead of L2‐norm for discontinuity preservation. This convex, non‐differentiable objective function is resolved by a
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A method for automated digital image‐based tracking of delamination fronts in translucent glass fibre‐laminated composite materials Strain (IF 1.313) Pub Date : 2020-04-02 Brian Lau Verndal Bak, Esben Lindgaard
A new automated digital image‐based method for tracking both the position and shape of the crack front of delaminations in translucent glass fibre‐laminated test specimens is proposed. The method is applicable to both fracture toughness tests and fatigue tests. The digital image‐based algorithm identifies the newly formed crack area by the change in reflected light and then extracts both the crack
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Issue Information Strain (IF 1.313) Pub Date : 2020-03-26
No abstract is available for this article.
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Electrical–structural characterisation of smart carbon‐based textile reinforced concrete beams by integrative gauge factors Strain (IF 1.313) Pub Date : 2020-03-20 Yiska Goldfeld, Lidor Yosef
The goal of this study is to characterise the piezoresistive capabilities of self‐sensory carbon roving reinforcements by means of integrative gauge factors (GFs). The correlation between the measured integrative electrical resistance of the carbon rovings and the distributed strain is experimentally investigated by two different textile reinforced concrete beams under monotonic flexural loading. Because
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Crack path tracking from full field measurements: A novel empirical methodology Strain (IF 1.313) Pub Date : 2020-03-18 Sylvia Feld‐Payet, Guy Le Besnerais, Vincent Bonnand, Didier Pacou, Léo Thiercelin
The identification of crack growth models requires the knowledge of the crack path geometry and, in particular, of the crack tip position. The objective of the present paper is to provide a criterion for the detection of the crack tip position regardless of the loading conditions or the material behavior. The novelty of the proposed approach is its ability to provide a good estimation of the crack
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Improvement of the digital image correlation close to the borders of an object Strain (IF 1.313) Pub Date : 2020-03-10 M. Baconnais, J. Réthoré, M. François
The measurement error of the finite‐element‐based Digital Image Correlation is reduced along the borders of an object by using the precise measurement, obtained by Virtual Image Correlation (VIC). The proposed method is called Virtual and Digital Image Correlation (VDIC). The boundary, identified by the VIC with a subpixel precision, is used firstly to create an adapted mesh and secondly to create
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A Bayesian approach to triaxial strain tomography from high‐energy X‐ray diffraction Strain (IF 1.313) Pub Date : 2020-02-28 J. N. Hendriks, C. M. Wensrich, A. Wills
Diffraction of high‐energy X‐rays produced at synchrotron sources can provide rapid strain measurements, with high spatial resolution, and good penetrating power. With an uncollimated diffracted beam, through‐thickness averages of strain can be measured using this technique, which poses an associated rich tomography problem. This paper proposes a Gaussian process (GP) model for three‐dimensional strain
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Issue Information Strain (IF 1.313) Pub Date : 2020-01-24
No abstract is available for this article.
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Procedure for accurate calculation of the J‐integral from digital volume correlation displacement data Strain (IF 1.313) Pub Date : 2020-01-21 T.H. Becker, M.R. Molteno, T.J. Marrow
The application of digital image and volume correlation techniques to obtain displacement fields from images has become ubiquitous in experimental fracture mechanics. In this paper, a procedure to extract the J‐integral (J) from three‐dimensional displacement fields obtained using digital volume correlation is presented. The procedure has been specially adapted to allow for experimental noise and errors
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Inverse identification of constitutive parameters from heat source fields: A local approach applied to hyperelasticity Strain (IF 1.313) Pub Date : 2020-01-20 Sylvain Charlès, Jean‐Benoît Le Cam
In this paper, a new inverse identification method of constitutive parameters is developed from full kinematic and thermal field measurements. It consists in reconstructing the heat source field from two different approaches by using the heat diffusion equation. The first one requires the temperature field measurement and the value of the thermophysical parameters. The second one is based on the kinematic
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An experimental study of the feasibility of phase‐based video magnification for damage detection and localisation in operational deflection shapes Strain (IF 1.313) Pub Date : 2020-01-08 M. Civera, L. Zanotti Fragonara, C. Surace
Optical measurements from high‐speed, high‐definition video recordings can be used to define the full‐field dynamics of a structure. By comparing the dynamic responses resulting from both damaged and undamaged elements, structural health monitoring can be carried out, similarly as with mounted transducers. Unlike the physical sensors, which provide point‐wise measurements and a limited number of output
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Adaptation of the strain measurement in textile reinforced cementitious matrix composites by distributed optical fibre and 2D digital image correlation Strain (IF 1.313) Pub Date : 2019-12-30 M. Saidi, A. Gabor
The study presented in this paper aims to adapt and calibrate two strain measurement techniques used for textile reinforced cementitious matrix composites (TRCMCs): distributed optical fibres and 2D digital image correlation (DIC). These composites exhibit tensile behaviour characterised by a succession of transverse cracks along specimens. During the tensile test, out‐of‐plane parasitic displacements
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Issue Information Strain (IF 1.313) Pub Date : 2019-11-19
No abstract is available for this article.
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Analysis of the accuracy on computing nominal stress in a biaxial test for arteries Strain (IF 1.313) Pub Date : 2019-11-17 M. Cilla, A. V. Corral, J. A. Peña, E. Peña
Biaxial tests are commonly used to investigate the mechanical behaviour of anisotropic soft biological tissues such as cardiovascular tissues. However, there is still no clear understanding of the influence that the biaxial test set‐up conditions may have on the computing material stress of the experimental results. The aim of the present study is to further investigate the accuracy of calculated material
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Determination of effective stress intensity factors under mixed‐mode from digital image correlation fields in presence of contact stresses and plasticity Strain (IF 1.313) Pub Date : 2019-11-10 Thomas Bonniot, Véronique Doquet, Si Hai Mai
Digital image correlation (DIC) is more and more popular to monitor fatigue crack growth and to determine the stress intensity factors. However, the posttreatment of the recorded displacement fields becomes tricky when the crack faces are not stress‐free and when crack tip plasticity becomes significant. Several posttreatment methods to locate the crack tip and measure the effective stress intensity
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Effect of continuous strain path changes on forming limit strains of DP600 Strain (IF 1.313) Pub Date : 2019-10-21 Xiao Song, Lionel Leotoing, Dominique Guines, Eric Ragneau
The strain path may change in actual sheet metal‐forming processes, so the determination of formability of sheet metal should consider the nonlinear strain path. For identifying the forming limit (FL) strains under nonlinear strain path, a conventional two‐step procedure with unloading is classically used to produce the strain path change, which results in no continuous measure of strain. The in‐plane
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Issue Information Strain (IF 1.313) Pub Date : 2019-09-16
No abstract is available for this article.
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Feature‐assisted stereo correlation Strain (IF 1.313) Pub Date : 2019-08-30 N. Iniyan Thiruselvam, Sankara J. Subramanian
Stereo correlation in digital image correlation (DIC) involves an optimisation problem that is sensitive to initial guess. In practice, this problem is circumvented by manually selecting a pair of points in the two stereo images that guarantees convergence and provides stereo mapping parameter estimates that are used as initial guesses at neighbouring subsets. However, such an approach is not always
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One‐step deposition of nano‐to‐micron‐scalable, high‐quality digital image correlation patterns for high‐strain in‐situ multi‐microscopy testing Strain (IF 1.313) Pub Date : 2019-08-30 J.P.M. Hoefnagels, M.P.F.H.L. van Maris, T. Vermeij
Digital image correlation (DIC) is of vital importance in the field of experimental mechanics, yet producing suitable DIC patterns for demanding in‐situ (micro)mechanical tests remains challenging, especially for ultrafine patterns, despite the large number of patterning techniques reported in the literature. Therefore, we propose a simple, flexible, one‐step technique (only requiring a conventional
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Implementation of traction constraints in Bragg‐edge neutron transmission strain tomography Strain (IF 1.313) Pub Date : 2019-08-22 Johannes Hendriks, Alex Gregg, Chris Wensrich, Adrian Wills
Several recent methods for tomographic reconstruction of stress and strain fields from Bragg‐edge neutron strain images have been proposed in the literature. This paper presents an extension of a previously demonstrated approach based on Gaussian process regression that enforces equilibrium in the method. This extension incorporates knowledge of boundary conditions, primarily boundary tractions, into
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An identification method of mechanical properties of materials based on the full‐field measurement method based on the fringe pattern Strain (IF 1.313) Pub Date : 2019-07-28 Mengmeng Zhou, Huimin Xie
With the development of image processing technology, optical methods based on fringe patterns, for example, the grid method, electronic speckle pattern interferometry, moiré techniques (including moiré interferometry and digital moiré), and coherent gradient sensing, have become useful techniques for measuring the full‐field deformation of materials and structures. An important application of these
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Single‐camera special stereo‐digital image correlation applied for accurate virtual fields method identification Strain (IF 1.313) Pub Date : 2019-07-25 Zhongya Zhang, Jiaqing Zhao, Yuxi Chi
A single‐camera special stereo‐DIC (SS‐DIC) is proposed for accurate virtual fields method (VFM) identification. The single‐camera SS‐DIC allows accurate surface 3D deformation measurements using a single colour camera and a specially designed colour separation device. It not only effectively eliminates the unavoidable out‐of‐plane movement/rotation due to unideal in‐plane loading but also delivers
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Evaluation of stress concentration of U‐shaped notch based on residual magnetic field measurements Strain (IF 1.313) Pub Date : 2019-07-18 Sheng Bao, Pengfei Jin, Zhengye Zhao, Qiang Luo
In this research, the correlation between the stress concentration and the residual magnetic field (RMF) of 30Cr steel was investigated. Tensile tests were carried out to measure the RMF signals on the surface of U‐shaped defect specimens. It was found that the tangential RMF signal at the defect area is correlated to the applied load and the stress concentration factor. A new method based on magnetic
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Issue Information Strain (IF 1.313) Pub Date : 2019-07-08
No abstract is available for this article.
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A reliable in vitro approach to assess the stability of acetabular implants using digital image correlation Strain (IF 1.313) Pub Date : 2019-06-12 F. Morosato, F. Traina, L. Cristofolini
The main cause of failure of the hip acetabular component is aseptic loosening. Preclinical test methods currently used to assess the stability of hip acetabular implants rely on crude simplifications. Normally, either one component of motion or bone strains are measured. We developed a test method to measure implant 3D translations and rotations and bone strains using digital image correlation. Hemipelvises
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Volumetric strain measurement of polymeric materials subjected to uniaxial tension Strain (IF 1.313) Pub Date : 2019-06-11 Marius Andersen, Odd Sture Hopperstad, Arild Holm Clausen
A novel method for measuring and calculating volumetric strain in circular cylindrical uniaxial tension samples made from polymeric materials is proposed. It is shown that special considerations must be taken when calculating volumetric strain when a sample is in a postnecking state. Solely based on surface data, the key feature of the proposed correction is that it allows for an inhomogeneous distribution
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A method of assessing the strength of metal surface using film samples on titanium alloy Ti‐1023 Strain (IF 1.313) Pub Date : 2019-05-23 Fang Quan, Zhitong Chen, Yu Zhu, Yun Zhang
The fatigue life of aerospace components depends greatly on the mechanical properties of the finished surface layer. However, no independent strength test of this layer has been reported because of the lack of suitable samples. Therefore, a direct method of assessing the surface tensile strength using film samples with thicknesses of approximately 40 μm is proposed in this paper. The immediate objective
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Fracturing behaviour of sandstone specimens with a cavity formed by intersecting excavations under compression: Experimental study and numerical modelling Strain (IF 1.313) Pub Date : 2019-05-21 Hao Wu, Guoyan Zhao, Pinnaduwa H.S.W. Kulatilake, Weizhang Liang, Enjie Wang
To investigate the mechanical properties, damage characteristics, and fracturing behaviour of specimens with a cavity formed by intersecting excavations, a series of uniaxial compression tests were conducted incorporating digital image correlation (DIC) and acoustic emission (AE) techniques. PFC2D modelling was conducted to further study the failure modes and crack evolution under biaxial loading.
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Design of heterogeneous mechanical tests: Numerical methodology and experimental validation Strain (IF 1.313) Pub Date : 2019-05-16 José Aquino, A. Gil Andrade‐Campos, João M. P. Martins, Sandrine Thuillier
Standard material parameters identification strategies for constitutive equations generally use an extensive number of classical tests for collecting the required experimental data. Recently, new specimen geometries for heterogeneous tests were designed to enhance the richness of the strain field and capture supplementary strain states using full‐field measurement techniques. The butterfly specimen
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