Numerical calculation of the tangent stiffness matrix in materials modeling

Numerical calculation of the tangent stiffness matrix in materials modeling
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材料建模中切向刚度矩阵的数值计算

DOI:
10.1002/pamm.201410200
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发表时间:
2014
期刊:
PAMM
影响因子:
--
通讯作者:
E. Werner
E. Werner
中科院分区:
--
文献类型:
--
作者:
F. Meier;C. Schwarz;E. Werner

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材料建模领域的有限元方法与本构定律的切向刚度矩阵密切相关。每个时间增量都需要这个所谓的雅可比矩阵,它描述了局部材料行为。它将应力增量分配给应变增量,对于平衡状态的数值确定至关重要。对于日益复杂的材料模型,如果有的话,只能通过分析来导出切线刚度矩阵,这需要付出很大的努力。因此数值方法被广泛用于其计算。我们提出了计算对数应变测量的切线刚度矩阵的方法。该方法与其他常用程序进行了比较。使用所提出的方法可以显着提高准确性。 (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA,魏因海姆)
The Finite Element Method in the field of materials modeling is closely connected to the tangent stiffness matrix of the constitutive law. This so called Jacobian matrix is required at each time increment and describes the local material behavior. It assigns a stress increment to a strain increment and is of fundamental importance for the numerical determination of the equilibrium state. For increasingly sophisticated material models the tangent stiffness matrix can be derived analytically only with great effort, if at all. Numerical methods are therefore widely used for its calculation. We present our method to calculate the tangent stiffness matrix for the logarithmic strain measure. The approach is compared with other commonly used procedures. A significant increase in accuracy can be achieved with the proposed method. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
DOI: 10.1016/j.msea.2013.02.067
发表时间: 2013
影响因子: 6.4
作者:
T. Taxer;C. Schwarz;W. Smarsly;E. Werner
通讯作者: E. Werner
DOI: 10.1115/1.2979872
发表时间: 2008-12
期刊: Journal of biomechanical engineering
影响因子: --
作者:
Sun W;Chaikof EL;Levenston ME
通讯作者: Levenston ME