A Constitutive Plasticity Model with Piecewise Linear Yield Surface and Damage
A Constitutive Plasticity Model with Piecewise Linear Yield Surface and Damage
复制标题
具有分段线性屈服面和损伤的本构塑性模型
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Vogler
中科院分区：
文献类型：
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作者：
S. Kolling;M. Vogler
在工程实践中，可靠地预测聚合物结构的行为是一个正在进行大量研究的课题。特别是，如果结构受到动力载荷作用，商业有限元程序中还没有考虑力学行为的本构模型。建立了包括颈缩、银纹、应变率依赖、卸载行为和损伤等重要现象的本构模型。特别是，考虑了不同的屈服面在压缩和拉伸和应变率相关的破坏中，后者具有损伤引起的冲蚀。用该公式可以成功地模拟标准验证试验。此外，弹性损伤模型可以用来充分地近似热塑性塑料的卸载行为。
Reliable prediction of the behaviour of structures made from polymers is a topic under considerable investigation in engineering practice. Especially, if the structure is subjected to dynamic loading, constitutive models considering the mechanical behaviour properly are not available in commercial finite element codes yet. A constitutive model is derived including important phenomena like necking, crazing, strain rate dependency, unloading behaviour and damage. In particular, different yield surfaces in compression and tension and strain rate dependent failure, the latter with damage induced erosion, are taken into account. With the present formulation, standard verification tests can be simulated successfully. Also, an elastic damage model can be used to approximate the unloading behaviour of thermoplastics adequately.