On the accuracies of numerical integration algorithms for Gurson-based pressure-dependent elastoplastic constitutive models

A class of generalized mid-point algorithms for pressure-dependent elastoplastic models is formulated in the paper. The accuracies of the formulated generalized mid-point algorithms including the Euler backward algorithm and the one-step Euler forward algorithm are systematically analyzed against th...

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Vydáno v:Computer methods in applied mechanics and engineering Ročník 121; číslo 1; s. 15 - 28
Hlavní autor: Zhang, Z.L.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier B.V 01.03.1995
Elsevier
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ISSN:0045-7825, 1879-2138
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Abstract A class of generalized mid-point algorithms for pressure-dependent elastoplastic models is formulated in the paper. The accuracies of the formulated generalized mid-point algorithms including the Euler backward algorithm and the one-step Euler forward algorithm are systematically analyzed against the exact solution for Gurson-based pressure-dependent elastoplastic model. The accuracies of the algorithms are assessed by means of iso-error maps. Results show that the formulated generalized mid-point algorithms are reasonably accurate in both small and large increment steps. It is found that in all the cases considered, the maximum errors in the presence of volumetric strain increments are less than those without volumetric strain increments. When the deviatoric strain increments are given in the radial direction, the true mid-point algorithm is the most accurate one. Furthermore, the optimal value α of the generalized mid-point algorithms, in terms of maximum errors, is observed between 0.5 and 1. For both small and large increment steps, the one-step Euler forward algorithm gives the worst accuracy.
AbstractList A class of generalized mid-point algorithms for pressure-dependent elastoplastic models is formulated in the paper. The accuracies of the formulated generalized mid-point algorithms including the Euler backward algorithm and the one-step Euler forward algorithm are systematically analyzed against the exact solution for Gurson-based pressure-dependent elastoplastic model. The accuracies of the algorithms are assessed by means of iso-error maps. Results show that the formulated generalized mid-point algorithms are reasonably accurate in both small and large increment steps. It is found that in all the cases considered, the maximum errors in the presence of volumetric strain increments are less than those without volumetric strain increments. When the deviatoric strain increments are given in the radial direction, the true mid-point algorithm is the most accurate one. Furthermore, the optimal value α of the generalized mid-point algorithms, in terms of maximum errors, is observed between 0.5 and 1. For both small and large increment steps, the one-step Euler forward algorithm gives the worst accuracy.
Author Zhang, Z.L.
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  fullname: Zhang, Z.L.
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Issue 1
Keywords Constitutive equation
Algorithms
Numerical integration
Elastoplasticity
Numerical method
Pressure
Quadratures
Language English
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Snippet A class of generalized mid-point algorithms for pressure-dependent elastoplastic models is formulated in the paper. The accuracies of the formulated...
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SubjectTerms Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Physics
Solid mechanics
Structural and continuum mechanics
Viscoelasticity, plasticity, viscoplasticity
Title On the accuracies of numerical integration algorithms for Gurson-based pressure-dependent elastoplastic constitutive models
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