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Relevant bibliographies by topics / Vumat

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Academic literature on the topic 'Vumat'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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Journal articles on the topic "Vumat"

1

Ming, Lu, and Olivier Pantalé. "An efficient and robust VUMAT implementation of elastoplastic constitutive laws in Abaqus/Explicit finite element code." Mechanics & Industry 19, no. 3 (2018): 308. http://dx.doi.org/10.1051/meca/2018021.

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This paper describes the development of an efficient and robust numerical algorithm for the implementation of elastoplastic constitutive laws in the commercial non-linear finite element software Abaqus/Explicit through a VUMAT FORTRAN subroutine. In the present paper, while the Abaqus/Explicit uses an explicit time integration scheme, the implicit radial return mapping algorithm is used to compute the plastic strain, the plastic strain rate and the temperature at the end of each increment instead of the widely used forward Euler approach. This more complex process allows us to obtain more prec

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2

Hohenberger, Travis W., Richard J. Windslow, Nicola M. Pugno, and James J. C. Busfield. "A CONSTITUTIVE MODEL FOR BOTH LOW AND HIGH STRAIN NONLINEARITIES IN HIGHLY FILLED ELASTOMERS AND IMPLEMENTATION WITH USER-DEFINED MATERIAL SUBROUTINES IN ABAQUS." Rubber Chemistry and Technology 92, no. 4 (2019): 653–86. http://dx.doi.org/10.5254/rct.19.80387.

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ABSTRACT Strain energy functions (SEFs) are used to model the hyperelastic behavior of rubberlike materials. In tension, the stress–strain response of these materials often exhibits three characteristics: (i) a decreasing modulus at low strains (&lt;20%), (ii) a constant modulus at intermediate strains, and (iii) an increasing modulus at high strains (&gt;200%). Fitting an SEF that works in each regime is challenging when multiple or nonhomogeneous deformation modes are considered. The difficulty increases with highly filled elastomers because the small strain nonlinearity increases an

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Khodaei, Meysam, Mojtaba Haghighi-Yazdi, and Majid Safarabadi. "Numerical modeling of high velocity impact in sandwich panels with honeycomb core and composite skin including composite progressive damage model." Journal of Sandwich Structures & Materials 22, no. 8 (2018): 2768–95. http://dx.doi.org/10.1177/1099636218817894.

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In this paper, a numerical model is developed to simulate the ballistic impact of a projectile on a sandwich panel with honeycomb core and composite skin. To this end, a suitable material model for the aluminum honeycomb core is used taking the strain-rate dependent properties into account. To validate the ballistic impact of the projectile on the honeycomb core, numerical results are compared with the experimental results available in literature and ballistic limit velocities are predicted with good accuracy. Moreover, to achieve composite skin material model, a VUMAT subroutine including dam

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Wan, Yun, Xin Lei Huang, and Li Min Zhou. "Parameter Study of Numerical Analysis on Low-Velocity Impact of GLARE 5 Fibre-Metal Laminates." Advanced Materials Research 1033-1034 (October 2014): 515–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.515.

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The impact performance play an important role to marine material. A numerical methodology including user material subroutine VUMAT, Johnson–Cook flow stress model and surface-based cohesive behaviour is employed to simulate the damage of the impact of GLARE 5 fibre-metal laminates (FML). Not only histories of absorbed energy, deflection, contact force are presented in our simulation, but the interface delamination is also investigated. After parameter study, suitable fracture energy in surface-based cohesive behaviour was found.

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5

Moghadasi, K., and KF Tamrin. "Multi-pass laser cutting of carbon/Kevlar hybrid composite: Prediction of thermal stress, heat-affected zone, and kerf width by thermo-mechanical modeling." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 9 (2020): 1228–41. http://dx.doi.org/10.1177/1464420720930754.

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Numerical modeling offers considerable promise to reduce costs associated with trial-and-error process in the manufacturing industry. In laser cutting of fiber-reinforced composites, the developed thermal stress in the cut region has considerable inﬂuence on the application of the machined composite and the end product quality. Nevertheless, measurement of the thermal stress is quite challenging in practice. Here, an uncoupled thermo-mechanical finite element model is developed to accurately predict formation of heat-affected zone, kerf width, thermal field, and thermal residual stress of an a

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6

Yi, Long, Yun Peng, Hou Quan Hong, and Yu Liang Li. "The Secondary Development of Nonlinear Viscoelastic Constitutive Model Based on ABAQUS." Applied Mechanics and Materials 138-139 (November 2011): 466–70. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.466.

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Based on the subroutine VUMAT, user-defined material model in the nonlinear finite element software ABAQUS/EXPLICIT, a nonlinear viscoelastic constitutive model is developed. The validify of the subroutine has been proven through the standard uniaxial tensile model. The shortage of finite element softwares which only have linear viscoelastic constitutive model is remedied. This paper presents the process of developing a material constitutive model and some useful technology. It can be referred for extending the material constitutive model in finite element softwares.

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Wang, Wen Ping, Min Wan, Hai Bo Wang, Xiang Dong Wu, and Ke Shan Diao. "Consititutive Modeling for Auto-Body Steel Sheet Incorporating Strain Rate and Temperature." Advanced Materials Research 189-193 (February 2011): 2925–29. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2925.

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Uniaxile tensile tests of auto-body steel sheet were performed at strain rate of 10-4 to 101s-1 and temperature of room temperature to 180°C. Strain rate and temperature sensitivity of flow stress were analyzed. It is found that the stress-strain curve is obviously heavily weighted on the temperature and strain rate. A new constitutive model was constructed and implemented into Abaqus/Explicit commercial software using user subroutine VUMAT. Verification of constitutive model shows that it has good agreement with experimental result.

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8

Wu, Zhi Gang, Shu Hui Li, and Wei Gang Zhang. "Finite Element Simulation and Experimental Verification of Hydropiercing-Bend Process." Advanced Materials Research 154-155 (October 2010): 1315–18. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1315.

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In recent years, hydropiercing technique has been used widely. In this work, its special type of hydropiercing-bend is simulated using Rice and Tracey ductile criterion based on VUMAT of ABAQUS/Explicit and verified by experiments. Hydropiercing-bend processes with different slope angles of chamfer are discussed to predict the ultimate quality. It is shown that the angle of chamfer should be less than 70º for this kind of material and technical condition in order to make the slug attached with the tube blank.

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Yue, Zhen Ming, Celal Soyarslan, Houssem Badreddine, Khemais Saanouni, and A. Erman Tekkaya. "Inverse Identification of CDM Model Parameters for DP1000 Steel Sheets Using a Hybrid Experimental-Numerical Methodology Spanning Various Stress Triaxiality Ratios." Key Engineering Materials 554-557 (June 2013): 2103–10. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.2103.

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A hybrid experimental-numerical methodology is presented for the identification of the model parameters regarding a mixed hardening anisotropic finite plasticity fully coupled with isotropic ductile damage in which the micro-crack closure effect is given account for, for steel sheets made of DP1000. The experimental tests involve tensile tests with smooth and pre-notched specimens and shear tests with specimen morphologies recently proposed by D.R. Shouler, J.M. Allwood (Design and use of a novel sample design for formability testing in pure shear, Journal of Materials Processing Technology, V

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Ristić, Svetlana, S. He, Albert Van Bael, and Paul van Houtte. "Texture-Based Explicit Finite-Element Analysis of Sheet Metal Forming." Materials Science Forum 495-497 (September 2005): 1535–40. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1535.

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An explicit integration algorithm using a texture-based plastic potential and isotropic hardening has been developed and implemented into a commercial explicit finite-element software program through a user material subroutine (VUMAT in ABAQUS/Explicit). Simulations of cup drawing of an IF-steel are presented and compared to both experimental data and calculation results obtained with a previously developed fully implicit approach (UMAT in ABAQUS/Standard). The explicit formulation has the advantage of being more stable, but local sheet thickness variations cannot be reproduced with the same a

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Dissertations / Theses on the topic "Vumat"

1

Mairesse, Julien. "Modélisation numérique du comportement rhéologique du bois soumis à une large gamme de vitesses de déformation : application au liège et au balsa." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR13990/document.

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Le bois est utilisé comme matériau absorbeur de chocs dans les conteneurs de transport du CEA. La simulation numérique des crashs tests de ces structures fait partie intégrante de leur développement et de leur validation. Il est donc impératif d’étudier expérimentalement les différentes essences de ces matériaux afin de mettre en évidence leurs caractéristiques et de déterminer leurs lois de comportement. En effet, ces données sont absolument nécessaires afin d’alimenter les modèles numériques retenus pour les simulations. A partir des modèles existants dans les codes de calcul ou par la progr

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Bernard, Chrystelle. "Intégration dans un code éléments finis d'un modèle de comportement en grandes déformations pour les polymères amorphes : applications à une large gamme de vitesses de déformation et à la mise en forme." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD018/document.

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De nos jours, de nombreuses pièces mécaniques sont fabriquées en polymères. Ces matériaux présentent un comportement complexe très sensible à la vitesse de déformation et à la température. De nombreux modèles de comportement mécanique, tenant compte de cette double sensibilité, ont été développés au cours des dernières années dans le but de décrire le comportement élasto-viscoplastique des polymères en grandes déformations sur de larges plages de vitesses de déformation et de températures. Afin de prévoir la tenue de pièces mécaniques en polymère soumises à un ensemble de sollicitations comple

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Francart, Charles. "Experimental and numerical study of the mechanical behavior of metal/polymer multilayer composite for ballistic protection." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD033/document.

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L’étude présentée porte sur le développement d’un modèle numérique destiné à évaluer les performances balistiques d’une structure multicouche polymère/métal frittée par procédé SPS. Les matériaux sont un alliage d’aluminium 7020 et un polyimide thermoplastique amorphe qui sont ensuite assemblés avec une résine epoxy. Le comportement mécanique de ces trois matériaux a été étudié sur de larges gammes de vitesses de déformations (de 0.0001 /s à 50.000 /s) et de températures (de -70°C à 500°C) correspondant aux conditions extrêmes rencontrées lors d’impacts à hautes vitesses. Afin d’améliorer la p

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Ming, Lu. "A numerical platform for the identification of dynamic non-linear constitutive laws using multiple impact tests : application to metal forming and machining." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/20112/1/MING_Lu.pdf.

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The main concern of this thesis is to propose a new inverse identification procedure applied to metal forming and machining situations, which can provide an appropriate parameters set for any elastoplastic constitutive law following J_{2} plasticity and isotropic hardening, by evaluating the correlation between the experimental and numerical responses. Firstly the identification program has been developed, which combines the Levenberg-Marquardt algorithm and the Data processing methods to optimize the constitutive parameters. In terms of experimentation, dynamic compression and tensile tests h

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Li, Bo. "Applications of Cohesive Zone Models in Dynamic Failure Analysis." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459953377.

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Tong, Xiaolong. "A Constitutive Model for Crushable Polymer Foams Used in Sandwich Panels: Theory and FEA Application." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1596806015399848.

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7

Salehi, Amir Salar. "3D finite element model for predicting cutting forces in machining unidirectional carbon fiber reinforced polymer (CFRP) composites." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/10485.

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Excellent properties of Carbon Fiber Reinforced Polymer (CFRP) composites are usually obtained in the direction at which carbon fibers are embedded in the polymeric matrix material. The outstanding properties of this material such as high strength to weight ratio, high stiffness and high resistance to corrosion can be tailored to meet specific design applications. Despite their excellent mechanical properties, application of CFRPs has been limited to more lucrative sectors such as aerospace and automotive industries. This is mainly due to the high costs involved in manufacturing of this materi

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Mqadi, Langalibalele Prince. "A criminological investigation into the treatment of juvenile offenders at Vuma Reform School." Thesis, 1992. http://hdl.handle.net/10530/668.

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Submitted in fulfilment of the requirements for the degree of MASTER OF ARTS in the Department of Criminology at the UNIVERSITY OF ZULULAND, 1992.<br>The investigation aims at analyzing, describing and explaining the treatment of juvenile offenders committed to Vuma Reform School by various South African juvenile courts. The analytical method of research is used to describe methods and programmes of treatment in order to gain insight into the treatment programme of Vuma Reform School. The documentary study technique, supplemented with an unstructured interview technique is used to analyse

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Books on the topic "Vumat"

1

Chaimoff, Chaim. Ahavah le-vubat ḥarsinah. ʻEḳed, 1998.

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Chaimoff, Chaim. Ahavah le-vubat ḥarsinah. ʻEḳed, 1998.

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3

Dajun, Yao. Thre giwoi đuong vuat. NXB Trke, 2000.

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Trịnh, Huy Triseu. Đuong vuat săn msoi: Nhzung đuong vuat mang bkan năng giret chóc. NXB Trke, 2006.

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5

Villeneuve, Gabrielle-Suzanne Barbot Gallon. Ngưxoi đẹp và quái vuat. NXB Kim Đsong, 2001.

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J, Jennings Terry. Đuong vuat nhko trong vưxon. NXB Kim Đsong, 2001.

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7

Nguynen, Q. Thoang. Qukang Nam, đrat nưwoc & nhân vuat. Văn hóa, 1996.

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8

Tạ, Duy Anh. Nhân vuat: Tác phtam chọn lọc. Văn hóa - Thông tin, 2002.

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Tạ, Duy Anh. Đi tìm nhân vuat: Titeu thuyret. Tku sách Tireng Quê Hương, 2003.

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Lê, Xuân Diuem. Cto vuat Champa =: Artefacts of Champa. Văn hóa dân tuoc, 1996.

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Book chapters on the topic "Vumat"

1

Gao, C. Y. "FE Realization of a Thermo-Visco-Plastic Constitutive Model using VUMAT in ABAQUS/Explicit Program." In Computational Mechanics. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75999-7_101.

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2

Fernandes, Vanessa Pincerato. "“SIA VUMA”: POR UMA UTOPIA LIBERTÁRIA." In Linguística, Letras e Artes e as Novas Perspectivas dos Saberes Científicos 4. Atena Editora, 2021. http://dx.doi.org/10.22533/at.ed.7862108035.

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3

Belle, B., and W. Marx. "Simulating airflow conditions in a South African coal mine, using the VUMA-Network simulation software." In Mine Ventilation. Taylor & Francis, 2002. http://dx.doi.org/10.1201/9781439833742.ch36.

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Conference papers on the topic "Vumat"

1

Han, Meidong, Zongxi Cai, Yitong Zhang, Chuanyong Qu, and Kui Chen. "A VUMAT of modified Mohr-Coulomb model and its application in TBM tunnelling simulation." In 2016 12th IEEE/ASME International Conference on Mechatronic and Embedded Systems and Applications (MESA). IEEE, 2016. http://dx.doi.org/10.1109/mesa.2016.7587145.

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2

Hamed, M., and K. Saanouni. "Elastoplastic Nonlocal Micromorphic Formulations With Damage Gradient." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82928.

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It is well known that the use of inelastic constitutive equations accounting for induced softening leads to pathological space (mesh) and time discretization dependency of the numerical solution of the Initial and Boundary value Problem (IBVP). To solve this drawback a thermodynamically-consistent formulation incorporating first gradient of micromorphic damage in the framework of micromorphic continuum is proposed. In this formulation the damage field is strongly coupled with mixed isotropic and kinematic nonlinear hardening together with micromorphic damage variables. A new finite element wit

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3

Zhang, Qian, Yanting Zhang, and Wenchun Jiang. "Model and Experimental Analysis of the Fiber-Reinforced Pultrusion Composite Under Tension and Shear." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93286.

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Abstract This paper proposed a homogenization model, and compiled a VUMAT subroutine to simulate the tension and shear of fiber-reinforced pultrusion composite (FRPC). Experiments were also performed to verify the accuracy of the homogenization model. The results show that, the simulation results agree well with the experiment data. The stiffness and strength increase with the increase of the diameter of the carbon composite part. The limit shear load and the horizontal shear strength decrease with the increase of the span. When FRPC is under shear with smaller span, the matrix tensile damage

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Soni, Sunilkumar, Jun Wei, Aditi Chattopadhyay, and Pedro Peralta. "Multi-Scale Modeling and Experimental Validation for Component Fatigue Life Prediction." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42610.

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A fatigue failure prediction procedure is discussed based on a two scale micro meso mechanical model for metallic structures. This model predicts the fatigue life and accounts for physical quantities like the mean stress effect in high cycle fatigue. Another model developed at meso-scale level with BCJ (Bammann, Chiesa and Johnson, 1996, Theoretical and Applied Mechanics, Tatsumi, Watanabe and Kambe (Editors), 359–376) internal state variables, is used to predict progressive damage in ductile materials. This meso-scale model is incorporated within the general purpose finite element software AB

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Pietryga, Michael P., Ivaylo N. Vladimirov, and Stefanie Reese. "Influence of Explicit and Implicit Integration of Hyperelastic-Plastic Combined Hardening Models on the Springback in Sheet Forming." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20372.

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In this paper, we investigate the computational efficiency of explicit and implicit integration schemes for hyperelastic-plastic combined hardening plasticity and examine the influence on the simulated springback in sheet metal forming. Due to the deviatoric character of the evolution equations, the finite strain combined hardening model discussed here is integrated by means of the exponential map algorithm in order to fulfil plastic incompressibility. We focus here on different possibilities of evaluating the exponential tensor functions of the material model. One option is to use the spectra

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Yi, Jiang Tao, Fook Hou Lee, Siang Huat Goh, Yu Ping Li, and Xi Ying Zhang. "Effective-Stress Finite Element Analysis of Spudcan Penetration." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83138.

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The numerical modeling of spudcan penetration involves technical challenges posed by large soil deformation coupled with significant material non-linearity. The Lagrangian approach commonly used for solid stress analysis often does not work well with large deformations, resulting in premature termination of the analysis. Recently, the Arbitrary Langrangian Eulerian (ALE) and the Eulerian methods have been used in spudcan analysis to overcome problems caused by the soil flow and large deformation. However, most of the reported studies are based on total stress analysis and therefore shed no lig

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Patel, Shivdayal, and Suhail Ahmad. "Failure Prediction of Fiber Reinforced Laminated Composite Plates Under Low Velocity Impact." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54486.

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The low velocity impact on composites has been studied as it leads to serious damage. The damage initiates as an intra ply matrix crack due to shear or bending which propagates further into the interface causing de-lamination between dissimilar plies and fiber breakage. This damage evolves with time and adversely affects the mechanical properties and strength of the composite. Since, multiple cracks in the ply are difficult to track, a progressive damage mechanics approach is used to model this failure. The inter ply failure is modeled using cohesive surfaces between the plies. The low velocit

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Lin, Lianshan, and Drew Winder. "Tunable EOS Material Model in the Simulation of Pulsed Mercury Spallation Target Vessel." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93292.

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Abstract A pulsed spallation target is subjected to very short (∼1μs) but intense loads from repeated proton pulses. The effect of this pulsed loading on the stainless-steel target module that contains flowing mercury target material is difficult to predict. Different simulation approaches and material models for the mercury have been tried. To date the best matching simulation to the experimental data was obtained by an equation of state (EOS) material model with a specified tensile cutoff pressure, which simulates the cavitation threshold [1]. The inclusion of a threshold to represent cavita

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Verma, Amrit Shankar, Philipp Ulrich Haselbach, Nils Petter Vedvik, and Zhen Gao. "A Global-Local Damage Assessment Methodology for Impact Damage on Offshore Wind Turbine Blades During Lifting Operations." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78218.

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Lifting the latest generation offshore wind turbines using floating crane vessels is extremely challenging. This comes with an elevated risk of blades impacting the tower or surrounding structures due to excessive crane tip motions from wave induced vessel motions. The wind turbine blades are primarily made of composite materials and thus are extremely vulnerable to impact loads causing complex damages and failure modes. One of the most critical damage type for wind turbine blades is delamination because delaminations cannot always be visually detected but can cause significant strength and st

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Wenman, Mark, James Barton, Kenneth Trethewey, Sean Jarman, and Paul Chard-Tuckey. "Finite Element Modelling of Transgranular Chloride Stress Corrosion Cracking in 304L Austenitic Stainless Steel." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61262.

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Austenitic stainless steels (ASS) have excellent resistance to general corrosion. However, these steels can be susceptible to localised corrosion such as pitting and crevice corrosion. In the presence of a tensile stress they can also exhibit stress corrosion cracking (SCC). In pressurised water reactor (PWR) nuclear plant incidents of SCC, especially chloride-induced SCC (CISCC), have been observed. Chloride ions which can lead to CiSCC of even low carbon austenitic grades can be introduced from many sources including the atmosphere and materials introduced into the reactor environment. Stres

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