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Fiber deformation behavior of discontinuous CFRTP in gear forging Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-20 Daichi Tatsuno, Takeshi Yoneyama, Misaki Kuga, Yoshitomo Honda, Yukihiro Akaishi, Hayato Hashimoto
The purpose of the study is to elucidate fiber deformation behavior during the forging of a spur gear by using a carbon fiber reinforced thermoplastic billet. The billet was composed of PA6/UD chips with a fiber length of 30 mm and fiber volume fraction of 50%. A gear forging mold was developed to deform the billet into a gear shape without cutting the fibers. Three types of billets were prepared:
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Investigation of an inverse thermal injection mould design methodology in dependence of the part geometry Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-18 C. Hopmann, J. Gerads, T. Hohlweck
The production of injection moulded components with low shrinkage and warpage is a constant challenge for manufacturers. The thermal design of the injection mould plays an important role for the achievable quality, especially the placement of the cooling channels. This design is usually based on empirical knowledge of the mould designers. The construction is supported iteratively by injection moulding
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Mold filling simulation and experimental investigation of metallic feedstock used in low-pressure powder injection molding Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-18 Mohamed Azzouni, Vincent Demers, Louis Dufresne
The mold filling stage of the low-pressure powder injection molding process was simulated numerically and validated by experimental injections. For this, a feedstock formulated from a 17-4PH stainless steel powder (60 vol.%) and a wax-based binder system (40 vol.%) was used. The feedstock was characterized to obtain its thermal properties and rheological profiles at different temperatures. These were
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Parameter identification of 42CrMo4 steel hot forging plastic flow behaviour using industrial upsetting presses and finite element simulations Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-08 Gabriel Venet, Cyrille Baudouin, Corentin Pondaven, Régis Bigot, Tudor Balan
An experimental-numerical methodology was proposed for the parameter identification of constitutive laws, when applied to hot forging. Industrial presses were directly used to generate the reference experiments for identification. The strain and temperature heterogeneity that appears during on-press compression experiments was taken into account by an FE-based inverse method. Specific experiments were
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Numerical modeling of mechanical properties of UAM reinforced aluminum hat sections for automotive applications Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-08 Hyunchul Ahn, M. Bryant Gingerich, Ryan Hahnlen, Marcelo J. Dapino, Farhang Pourboghrat
Structural lightweighting is a key initiative in the automotive sector due to regulatory, customer, and powertrain demands. This research focuses on reinforcing aluminum sheet metal in strategic locations using ultrasonic additive manufacturing (UAM), as guided through an iterative optimization and simulation process. Among the three models used, the most successful is the multi-step model (MSM) which
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Investigations of batch fluctuation regarding tribological conditions in series production of car body parts Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-08 B. Hansen, P. Wagner, S. Purr, M. Merklein
Fluctuations of material properties are one reason for the occurrence of cracks and waviness in series production of car body parts. Especially fluctuating tribological conditions have an effect on the friction behavior and thus on the material flow. So far fluctuating material properties are not considered in the standard FE-simulation and consequently not in the tool design. In order to enhance the
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Investigation of the formability behaviour during stamping of tufted and un-tufted carbon preforms: towards localized reinforcement technologies Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-08 I. Gnaba, D. Soulat, X. Legrand, P. Wang
The originality of this work consists in the study of the stamping behaviour of tufted and un-tufted carbon preforms. Several preforms by varying the tufting thread orientations (0°, 90° and 0°/90°) and with different stratifications ([0°/90°,-45°/+45°] and [0°/90°,-45°/+45°]2) were manufactured in order to study their out-of-plane deformability. The stamping test was carried out using a hemispherical
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Control and optimization of bulge defect in incremental forming of cu-Al bimetal Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-07 Qin Qin, Liu He, Cheng Li
The bimetal sheets products obtained by the incremental forming are gradually widely used because of the excellent properties of the bimetal sheets. But the forming process of the bimetal sheets is more complicated than that of single metal sheet because this process involves a complicated interface of the bimetal sheets. A three-dimensional model including the tool, the bimetal sheet and the cohesive
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Modelling of shrinkage formation in casting by the phase field method Int. J. Mater. Form. (IF 1.634) Pub Date : 2021-01-05 Zahra Jalouli, Aude Caillaud, Julien Artozoul, Amine Ammar, Ahmed El-Abidi, Ahmed Fettah
Most commercial softwares simulating casting process use a scalar field to quantify the shrinkage on final parts. The repartition of this scalar is used to localize shrinkage in the part. In this work, the objective is to use a new approach to predict morphological information about size and shape of shrinkage: the phase field method. This method is based on a parameter order defining the alternating
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Manufacture of an aerospace component with hybrid incremental forming methodology Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-11-19 Pranav Gupta, Alexander Szekeres, Jacob Jeswiet
Single point incremental forming is a promising sheet metal forming technique for small batch production. However, the technique is unable to manufacture vertical walls without significant thickness variation and geometrical errors. Two-point incremental forming has the capability of manufacturing vertical walls but requires actuators and intricate rig designs. This paper presents a design facilitating
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Construction of physical welding windows for magnetic pulse welding of 5754 aluminum with DC04 steel Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-11-16 C. Khalil, S. Marya, G. Racineux
Magnetic pulse welding (MPW) has potential applications where fusion welding is problematic, such as in dissimilar joints or where the very part integrity, as in electronic components, is likely to be impaired by hot environments. Mostly suited in lap configuration, its successful implementation hinges on multiple process parameters such as standoff distance between two parts, the discharge energy
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Closed-loop control of product geometry by using an artificial neural network in incremental sheet forming with active medium Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-11-13 S. Thiery, M. Zein El Abdine, J. Heger, N. Ben Khalifa
A strategy to adjust the product geometry autonomously through an online control of the manufacturing process in incremental sheet forming with active medium is presented. An axial force sensor and a laser distance sensor are integrated into the process setup to measure the forming force and the product height, respectively. Experiments are conducted to estimate the bulging behavior for different pre-determined
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Investigation on formability improvement in laser shock hydroforming Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-11-13 Yanchen He, Jinxi Gong, Huixia Liu, Youjuan Ma, Jiaxin Lu, Xiao Wang
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Numerical and experimental response of FSSW of AA5052-H32/epoxy/AA5052-H32 sandwich sheets with varying core properties Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-11-01 Pritam Kumar Rana, R. Ganesh Narayanan
The present work aims to assess the joint behaviour of friction stir spot welded sandwich sheets by changing the quality of the epoxy core layer. Lab scale experiments and numerical simulations are conducted for the purpose. The core property is altered by varying hardener to resin (h/r) ratio within a suitable range. Joint mechanical performance and joint characterization are evaluated from experiments
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Numerical modeling and anvil design of high-speed forging process for railway axles Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-29 Yakun Xu, Yan Zhang, Xincun Zhuang, Zhongyuan Cao, Yuanhe Lu, Zhen Zhao
Railway axles, which are an important component of railway vehicles, are generally manufactured using high-speed forging processes. To investigate the microstructure evolution and flow behavior during forging processes, a series of isothermal hot compression and heating tests were conducted in the temperature range of 900–1200 °C and strain rate range of 0.01–20 s−1. A strain-compensated Arrhenius
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Study on barrelling behavior of variable-diameter tubes in axial hydro-forging sequence Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-29 Lei Sun, Shengjie Yao, Jiguang Li, Caiyuan Lin, Guodong Wang, Guannan Chu
Axial hydro-forging sequence is an emerging approach in forming the variable-diameter tubes without thinning. However, after the batch production, a barrelling defect occurs at the end of the maximum diameter zone during the process. To investigate the barrelling behavior of the tube in axial hydro-forging sequence, experiments and finite element simulation were carried out in the present work. It
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Advanced disk-forging process in producing heavy defect-free disk using counteracting dies Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-27 Namyong Kim, Il Yeong Oh, Sang Wook Han, Ji Hoon Kim, Chester J. VanTyne, Young Hoon Moon
During the conventional disk-forging, the upper die repeatedly compresses materials on the flat stationary base. As the strain distributions of the forged disk are non-uniform owing to friction and uneven temperature distribution, more uniform deformation within the entire volume is desirable to obtain sound disk free from defects. This study proposes an advanced disk-forging process in the production
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Warm forming simulations of Al-Mg alloy sheet using a viscoplastic model and advanced yield functions Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-23 Qing Zhang, Yong Zhang, Yuantao Sun, Dateng Zheng
Al-Mg alloys have the properties of anisotropy, temperature softening and strain rate hardening in warm forming conditions. The former could be modeled by an advanced non-quadratic yield function. The rate-dependent characteristic could be modeled by viscoplastic constitutive models. Up to now, few investigations have combined a viscoplastic model with advanced yield functions for warm forming simulation
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Comparative assessment of failure strain predictions using ductile damage criteria for warm stretch forming of IN718 alloy Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-12 Gauri Mahalle, Nitin Kotkunde, Amit Kumar Gupta, Swadesh Kumar Singh
It is vital to envisage accurately the fracture limits of high strength superalloys when noticeable localized necking or thinning tendency is not observed during sheet-metal stretch forming process. The present study mainly focuses on fracture limits evaluation of Inconel 718 alloy (IN718) in the effective plastic strain (EPS) vs. average triaxiality space. First, uniaxial tensile test, to analyze
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Thermal analysis of the fused filament fabrication printing process: Experimental and numerical investigations Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-12 David Xu, Yancheng Zhang, Franck Pigeonneau
A 3d printing of a thin wall is achieved by a fused filament fabrication process. The influence of the printing velocities on the filament morphology is studied using optical microscopy. The strand morphology is approximated to different geometries and compared to experimental data. The oblong cross-section is a good approximation to estimate the strand’s height and width. A local temperature is recorded
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A study of the mechanical properties of a Mg-Al-Zn alloy (AZ91) produced via Thixomolding Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-09 Mitsuhiro Okayasu, Takahiro Fukui
In this work, the mechanical properties and failure characteristics of a Mg-9.0Al-0.8Zn alloy (AZ91) fabricated via the Thixomolding process (TC) were investigated and compared with those of alloys formed via other casting processes, including cold-chamber die-casting (CD) and hot-chamber die-casting (HD). The microstructure of the three cast samples mainly consisted of the α-Mg phase and eutectic
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Joining polymer parts with self-tapping screws: an improvement of the screw thread geometry Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-10-05 Wilmer E. Cumbicus, Manuel Estrems, Miguel Arizmendi, Amaia Jiménez
In the present article, the influence of the self-tapping screw’s geometry during the thread forming processes in polymer types used in several industries was studied and analysed using experimental measurement and the finite element method. A number of parameters, such as assembly, type of materials and geometry, were studied. Several commercial screw topologies were also studied, and it was demonstrated
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Advances in anisotropy of plastic behaviour and formability of sheet metals Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-24 Dorel Banabic, Frédéric Barlat, Oana Cazacu, Toshihiko Kuwabara
This paper reviews the most recent models for description of the anisotropic plastic behavior and formability of sheet metals. After a brief review of classic isotropic yield functions, recent advanced anisotropic criteria for polycrystalline materials of various crystal structures and their applications to cup drawing are presented. Next, the discussion focuses on novel formulations of anisotropic
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Braid-press forming for manufacturing thermoplastic CFRP tube Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-24 D. Tatsuno, T. Yoneyama, T. Kinari, E. Sakanishi, T. Ochiai, Y. Taniichi
Braid-press forming was developed for manufacturing hollow tube parts made of carbon fiber reinforced thermoplastic (CFRTP) tape. The CFRTP tapes were braided to make a tube, which was consolidated under pressure and heat in the press forming process. Internal pressure was applied to the braided CFRTP tube by a silicone rubber rod inserted in the tube using axial compression. The reason for using a
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Calibration of the residual stresses with an active die during the ejection phase of cold extrusion Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-18 Alessandro Franceschi, Fabian Jaeger, Holger Hoche, Matthias Oechsner, Peter Groche
The resulting tensile residual stresses on the surface of cold full-forward extruded parts are unfavorable for the fatigue life of these parts. The final stress state is determined by the combination of two process stages: forming and ejection. This is due to the fact that the workpiece undergoes a second plastic deformation after forming during the ejection from the die. So far, literature is focusing
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Response to the letter to editor Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-17 Nitin Chandola, Oana Cazacu, Benoit Revil-Baudard
This extended comment is in response to the letter of Barlat (Int J Mater Form 2020) concerning our recent article (Chandola et al. (Int J Mater Form 12(6):943–954 2019)). The main issue raised is an apparent “mismatch” between some of the F.E. results presented and cup forming data of Tucker (Acta Metall 9:275-286 1961). There is no mismatch because the simulation results presented in our paper correspond
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An application of fully coupled ductile damage model considering induced anisotropies on springback prediction of advanced high strength steel materials Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-17 M. Yetna N’jock, H. Badreddine, C. Labergere, Z. Yue, K. Saanouni, V.-T. Dang
In this paper, an advanced model formulated in the framework of non-associative plasticity is used to accurately predict the springback of advanced high strength steels material. The proposed model strongly couples the isotropic ductile damage to the phenomena a combined nonlinear isotropic and kinematic hardening, initial anisotropic plastic flow and induced anisotropies due to the distortion of the
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Effect of tension-compression testing strategy on kinematic model calibration and springback simulation of advanced high strength steels Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-13 Junying Min, Nan Guo, Yong Hou, Kaiwei Jiang, Xinping Chen, John E. Carsley, Jianping Lin
Various studies show that application of kinematic hardening models significantly improves the accuracy of springback simulation in sheet metal forming. The springback simulation using kinematic hardening models, e.g., the Yoshida-Uemori (YU) model, is highly dependent on the testing strategy and the calibration of model parameters. In this study, the effect of tension-compression (T-C) testing strategy
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Experimental and numerical study on the tensile failure behavior of toughened-interlayer composite laminates with automated fiber placement (AFP) induced gap and overlap defects Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-08-03 Minh Hoang Nguyen, Paul Davidson, Anthony M. Waas
Predictive computational modeling of the effect of automated fiber placement (AFP) defects on the structural performance of aerospace structural composites is of importance in preliminary design. A finite element method (FEM) based framework is presented for the analysis of the quasi-static tensile response of quasi-isotropic [45/0/ -?45/90]2s laminates containing controlled gaps and overlaps in the
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Influence of surface roughness on cold formability in bending processes: a multiscale modelling approach with the hybrid damage mechanics model Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-07-19 Peerapon Wechsuwanmanee, Junhe Lian, Fuhui Shen, Sebastian Münstermann
Experimental and numerical investigations on the description of cold formability of extra abrasion-resistant steel considering surface roughness effects were performed in this study. A novel multiscale numerical approach to quantitatively evaluate the impacts of surface roughness on the cold formability/bendability of heavy plates was proposed and verified. The macroscopic ductile damage behavior of
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Deformability of bamboo impregnated with thermosetting resin in upset forging Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-07-19 Masako Seki, Yuko Yashima, Tomoaki Kiryu, Tsunehisa Miki, Soichi Tanaka, Kozo Kanayama
We developed a processing technique to apply plastic deformation to solid bamboo impregnated with thermosetting resin. To prevent the forming defects such as incomplete filling during upset forgings, we investigated the factors that affect the deformability of the bamboo. We conducted compression tests of the bamboo impregnated with phenol-formaldehyde resin using flat dies. The die temperature and
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A novel sensitivity analysis on friction spot joining process performed on aluminum\polycarbonate sheets by simulation Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-07-15 Giuseppe Serratore, Francesco Gagliardi, Clara Argerich Martín, Ruben Ibanez Pinilo, Elias Cueto, Luigino Filice, Francisco Chinesta
The manufacturing research has been focusing on the improvement of product performance and lightweight design. The synergic effects between material properties and manufacturing solutions have been considered, extensively. Specifically, joining techniques have been developing with the aim to propose new suitable solutions considering dissimilarities in the properties of the materials that have to be
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Enhancement of adhesion between the polymeric liner and the metallic connector of high-pressure hydrogen storage tank Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-07-11 V. Motaharinejad, L. Delnaud, M. Fouque, A. Lucas, M. Shirinbayan, J. Fitoussi, A. Tcharkhtchi
The importance of manufacturing of hydrogen fuel tanks due to the application of hydrogen fuels in clean and recyclable energy is one of the most important issues of substituting the petroleum fuels. They consist of two main parts: Plastic liner, as a barrier escape of hydrogen and Carbon Fiber Reinforced Polymer (CFRP) layer to strengthen tanks. The liner plastic could be manufactured by rotational
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Surface and mechanical characterization of stationary shoulder friction stir welded lap joints: experimental and numerical approach Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-07-07 Gianluca Buffa, Livan Fratini, Filomena Impero, Attilio Masnata, Fabio Scherillo, Antonino Squillace
Friction Stir Welding (FSW) is one of the most used solid-state welding processes in the aeronautical, aerospace, ground transportation and naval fields. Stationary Shoulder Friction Stir Welding (SSFSW) is a recently introduced variant of the process allowing lower heat input into the joints, with beneficial effects in terms of joint mechanical properties, microstructure and top surface finish. In
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A preform deformation and resin flow coupled model including the cure kinetics and chemo-rheology for the VARTM process Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-07-01 Da Wu, Ragnar Larsson, Brina Blinzler
The present paper deals with preform deformation and resin flow coupled to cure kinetics and chemo-rheology for the VARTM process. By monitoring the coupled resin infusion and curing steps through temperature control, our primary aim is to reduce the cycle time of the process. The analysis is based on the two-phase porous media flow and the preform deformation extended with cure kinetics and heat transfer
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On the temperature evolution during continuous laser-assisted tape winding of multiple C/PEEK layers: The effect of roller deformation Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-06-30 S. M. Amin Hosseini, Ismet Baran, Martin van Drongelen, Remko Akkerman
Laser-assisted tape winding (LATW) is a highly automated process for manufacturing tubular-like fiber-reinforced thermoplastic composites such as flywheels and pipes. One of the crucial parameters in the LATW process is the temperature of the nip point at which the incoming prepreg tape is bonded with the substrate by a compaction roller. Therefore, the temperature evolution of the nip point plays
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The Effect of the tooling temperature on the mechanical properties of CSC-15B22 Steel sheets that undergo tailored tempering Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-06-16 Li-Wei Chen, Chun-Han Tu
A tailored tempering process, whereby the cooling rate for the sheet is controlled to form regions with very high strength and regions of reduced strength but increased ductility. In order to obtain the optimal mechanical properties for CSC-15B22 steel sheets that undergo tailored tempering, experimental and simulation method are used to examine the tempering process. The heated die section is heated
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Correction to: study and modeling of high-density polyethylene coalescence under the extrusion conditions Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-06-16 Abderrahmane Lamri, Saad Lamouri, Djamal Eddine Kherroub, Said Lotfi Hafsaoui, Farid Bakir, Abbas Tcharkhtchi
The original publication of this article unfortunately contains error. The word “extrusion” was spelled incorrectly as “extrussion” in the article title.
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Optimized and validated prediction of plastic yielding supported by cruciform experiments and crystal plasticity Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-06-10 Holger Hippke, Sebastian Hirsiger, Bekim Berisha, Pavel Hora
The predictability of strain distributions and the related prediction of hardening and failure plays a central role in tool and process design for any metal forming process. Studying yielding behaviour, it was discovered that for various well established yield loci no satisfying agreement between DIC (digital image correlation) measurement of strain distribution and simulation result could be obtained
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Electromagnetic field propagation in a composite laminate and induced thermal field Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-06-08 Anais Barasinski, Chady Ghnatios, Erik Abenius, Stephane Bechtel, Francisco Chinesta
Microwave (MW) technology relies on volumetric heating, where thermal energy is induced from an electromagnetic field. Nowadays, the main drawback of this technology is that the complex physics involved in the conversion of electromagnetic energy into thermal energy is not entirely understood and controlled. The main objective of this work is to model, simulate and validate the interactions of microwaves
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Spurious-free interpolations for non-intrusive PGD-based parametric solutions: Application to composites forming processes Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-06-03 Chady Ghnatios, Elias Cueto, Antonio Falco, Jean-Louis Duval, Francisco Chinesta
Non-intrusive approaches for the construction of computational vademecums face different challenges, especially when a parameter variation affects the physics of the problem considerably. In these situations, classical interpolation becomes inaccurate. Therefore, classical approaches for the construction of an offline computational vademecum, typically by using model reduction techniques, are no longer
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Numerical simulation of self heating during stretch blow moulding of PET: viscohyperelastic modelling versus experimental results Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-27 Yun-Mei Luo, Luc Chevalier, Eric Monteiro, Françoise Utheza
During the stretch blow moulding (SBM) process of polyethylene terephthalate (PET) bottle, high viscous dissipation generates self heating phenomena. Since the influence of temperature on polymer’s behavior is important, it is necessary to evaluate the self heating values in order to manage accurately the simulation of the process. An anisotropic visco-hyperelastic model has been developed to manage
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A Critical Review and Assessment of Different Thermoviscoplastic Material Models for Simultaneous Hot/Cold Forging Analysis Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-26 Marvin Nahrmann, Anton Matzenmiller
The simultaneous hot/cold forging is an innovative production process, taking advantage of the high accuracy for cold forming and low forces for hot forming. However, the choice of a suitable material model for such a large temperature range is a difficult issue and insufficiently regarded. Hence, the aim of this contribution is a critical review and assessment of the prediction capability and accuracy
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Study and modeling of high-density polyethylene coalescence under the extrussion conditions Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-26 Abderrahmane Lamri, Saad Lamouri, Djamal Eddine Kherroub, Said Lotfi Hafsaoui, Farid Bakir, Abbas Tcharkhtchi
During the extrusion of thermoplastic particulates, the major problem is to adjust and optimize the experimental conditions of temperature and rotational speed of the screw, to decrease porosity defects, resulting from the coalescence of the polymer grains. In this work, a study of high-density polyethylene (HDPE) coalescence as a function of temperature and shear rate is conducted, with modeling of
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Composites based on polyphtalamides matrices and continuous glass fibers: structure-processing and properties relationships Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-20 M. Yousfi, M. Dkier, M. Colella, K. Lamnawar, A. Maazouz
Continuous Glass Fiber-Reinforced Thermoplastic Composites (GFRTC) were successfully prepared using two different routes: a reactive laboratory-created approach as well as a compression molding method. Two kinds of high-performance polyphtalamides (PPA) were studied: PPA from a chain extension reaction of its parent prepolymer (named R-PPA) in comparison with a virgin non-reactive PPA (NR-PPA). For
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Thermo-mechanical characterization of unsaturated polyester/glass fiber composites for recycling Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-19 A. Nouigues, E. Le Gal La Salle, J-L. Bailleul
Unsaturated-polyester/glass-fiber composites are worldwide more and more used. Actually, their thermochemical and mechanical recycling paths are quite well-known. But, due to the relatively low value of the end products, these two paths are hardly economically viable. Thus, a third way will be proposed as a thermomechanical path. In order to recycle these composites, a study of their thermo-mechanical
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A novel differential lubrication method for push-bending of L-shaped thin-walled tube with 1D bending radius Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-19 Xuefeng Xu, Yubin Fan, Yiwang Wu, Kongwei Wu, Jie Xiao
A novel differential lubrication method is proposed to improve the deformation behavior of L-shaped thin-walled with relative bending radius of 1 in push-bending process. The optimized tube blank is divided into four zones: inner deformation zone, inner guide zone, outer deformation zone and outer guide zone, which are lubricated with different lubricants. The differential lubrication and uniform lubrication
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Constitutive behavior and hot workability of multi-direction forged T2 copper during hot compression deformation Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-13 Hongming Zhang, Jing Wang, Guobin Liu, Gang Chen, Fei Han
The hot deformation behavior of a multi-direction forged (MDFed) T2 copper was investigated by the isothermal compression test at deformation temperatures between 673 and 1173 K and strain rates between 0.001 and 10 s− 1. The results reveal that the deformation characteristics of the flow stress are sensitive to the hot deformation parameters. The deformation activation energy of the MDFed copper under
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Effect of single and multiple parts manufacturing on temperature-induced residual stress problems in SLM Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-13 Nihat Yılmaz, Mevlut Yunus Kayacan
In this study, the effects of the single and multiple productions of samples by additive manufacturing on residual stress and displacement (distortions) were investigated. The samples were manufactured by Selective Laser Melting (SLM) machine using Ti6Al4V powders. Each time a different number (1, 5 and 13 samples) of cubic shaped samples were produced on the building platform. During the process,
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The effect of pre-heat temperature on the formability of a glass-fibre/polypropylene and steel-based fibre–metal laminate Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-09 Davood Rahiminejad, Paul Compston
This paper presents an experimental and numerical investigation into the effect of pre-heat temperature on stretch forming of a fibre metal laminate (FML) comprised of alternating layers of steel and woven (0/90) glass-fibre polypropylene in a 2:1 configuration. Hourglass sample geometries were formed in an open die and real-time photogrammetry was used to measure the evolution of strain fields over
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Influence of thickness reduction on forming limits of mild steel DC01 Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-06 Pedram Farahnak, Miroslav Urbánek, Pavel Konopík, Jan Džugan
The Forming Limit Diagram (FLD) is an essential tool to assess sheet metal formability in sheet metal deep drawing. In FLDs/FLC (Forming Limit Curve) is representation of material formability limits at which material is not able to withstand higher deformation. In this work, different methodologies for FLC determination of mild steel DC01 are investigated. The Nakajima test is a well-known experiment
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Rotational Molding of Polyamide-12 Nanocomposites: Modeling of the Viscoelastic Behavior Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-06 M. Shirinbayan, A. Montazeri, M. Nouri Sedeh, N. Abbasnezhad, J. Fitoussi, A. Tcharkhrtchi
Nowadays, polyamide 12 (PA-12) is considered as an interesting polymer in the rotomolding process to manufacture different pieces like the liner part in the storage hydrogen tank (type IV). In this study, the pure polyamide-12 and PA12 pieces, incorporated with 0.5%, 1% and 3% wt Nano Carbon Black (NCB), were manufactured by the rotomolding process. Different rotomolding parameters such as heating
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From specified product tolerance to acceptable material and process scatter: an inverse robust optimization approach Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-05-04 O. Nejadseyfi, H. J. M. Geijselaers, E. H. Atzema, M. Abspoel, A. H. van den Boogaard
Production efficiency in metal forming processes can be improved by implementing robust optimization. In a robust optimization method, the material and process scatter are taken into account to predict and to minimize the product variability around the target mean. For this purpose, the scatter of input parameters are propagated to predict the product variability. Consequently, a design setting is
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Analytical friction force compensation of flow curves out of layer compression tests with the pin extrusion test Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-04-29 Matthias Lenzen, Martin Kraus, Marion Merklein
For conventional material models like Yld2000-2d or BBC05 the equi-biaxial yield strength is required for the parameter identification. In this context, a commonly used test setup is the hydraulic bulge test. However, an inaccuracy in the characterization of the initial yield strength is present in the hydraulic bulge test. Due to the evaluation of the resulting curvature of the specimen, that is nearly
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Effect of vibration on machining and mechanical properties of AZ91 alloy during FSP: modeling and experiments Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-04-20 Behrouz Bagheri, Amin Abdollahzadeh, Mahmoud Abbasi, Amir Hossein Kokabi
The objective of the research is to determine the effect of friction stir processing (FSP) parameters and vibration on the machining behavior of AZ91 alloy. The article displays the state of the art of AZ91 alloy machinability including chip formation, chip morphology, and cutting forces. In this method, the vibration was applied to the process line through the fixture under the workpiece during the
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A modified Johnson-Cook model of AA6061-O aluminum alloy with quasi-static pre-strain at high strain rates Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-04-20 Shuaishuai Yang, Liqiang Sun, Huakun Deng, Guangyao Li, Junjia Cui
In this paper, specimens were first pre-stretched to different pre-strain coefficients (0, 0.4 and 0.8) under quasi-static tensile for AA6061-O aluminum alloy. Then, the specimens with different pre-strain coefficients were stretched by a high-speed tensile machine (HTM) at different strain rates (200 s− 1, 400 s− 1 and 600 s− 1). Digital image correlation (DIC) technique was employed to measure the
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Electromagnetic flanging: from elementary geometries to aeronautical components Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-04-02 Cheikh Tidiane Sow, Grégoire Bazin, Thomas Heuzé, Guillaume Racineux
Aeronautical companies are manufacturing many components of small (less than 200 mm) and medium (between 200 mm and 1000 mm) sizes by flexforming. In order to diversify the production facilities of these components, these companies are interested in evaluating the ability of electromagnetic forming processes to produce small parts. This paper describes the design of a set of experiments of electromagnetic
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Electromagnetic impacting medium forming (EIMF) for aluminum alloy tube by using flat spiral coil Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-03-23 Junrui Xu, Moxi Hua, Yuanhua Feng, Pengfei Gao, Junjia Cui
This paper proposes an innovative electromagnetic forming process for the manufacturing of aluminum alloy tubes, namely electromagnetic impacting medium forming (EIMF) process using flat spiral coil. The proposed EIMF process was implemented and characterized by numerical and experimental methods. Based on medium height and discharge energy, deformation region of tube was analytically determined and
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Advanced FE model validation of cold-forming process using DIC: Air bending of high strength steel Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-03-04 S. Gothivarekar, S. Coppieters, A. Van de Velde, D. Debruyne
Recent advances in mechanical and civil engineering are noticed in many innovative designs that frequently employ cold-formed High Strength Steels (HSS). Typical mobile cranes benefit from the advanced properties of these steel grades in a bent configuration. Here, the majority of load-carrying members are produced through cold-bending and subsequent welding procedures. These cold-foring processes
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Uncertainty analysis of the influence of delivery system nozzle structure on fluid-thermal coupling in casting molten Pool Int. J. Mater. Form. (IF 1.634) Pub Date : 2020-03-04 Bowen Yue, Guangming Zhu, Xiaolin Cao, Song Qiao, Nana Guo, Yukun An
The quality of thin strip products is determined by the flow and heat transfer in a molten pool of twin-roll casting, thus it is of great significance to study the structure parameters of the delivery system, including the angle and height of end face nozzle, the angle and height of side nozzle as well as the taper angle of side nozzle. A methodology for simulation of twin-roll thin strips continuous