Stress-state-dependence of damage strain rate tensors caused by growth and coalescence of micro-defects
Stress-state-dependence of damage strain rate tensors caused by growth and coalescence of micro-defects
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DOI：
10.1016/j.ijplas.2014.04.007
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发表时间：
2014-12-01
影响因子：
9.8
通讯作者：
Hagenbrock, Vanessa
中科院分区：
文献类型：
--
作者：
Bruenig, Michael;Gerke, Steffen;Hagenbrock, Vanessa
本文从微观上研究了应力状态相关的缺陷生长和聚合对韧性金属的损伤和断裂行为。对连续损伤模型进行了推广，考虑了应力状态对损伤和破坏准则以及损伤应变演化方程的影响。不同的分支被认为对应于不同的微观机制，取决于应力状态：增长的空洞，微剪切裂纹的形成和它们的组合。为了更深入地了解这一复杂的损伤和破坏行为，对含孔洞的单胞进行了一系列三维细观力学数值分析。这些计算涵盖了拉伸、剪切和压缩域中的各种应力状态。数值结果被用来显示一般趋势所造成的增长和合并的微缺陷。它们也被用来开发方程的应力状态相关的损伤准则，提出损伤应变率张量的演化方程，并引入一个合并条件和断裂准则制定的损伤应变张量。(C)2014爱思唯尔有限公司版权所有。
The paper deals with damage and fracture behavior of ductile metals caused by stress-state-dependent growth and coalescence of defects on the micro-level. The continuum damage model has been generalized to take into account the effect of stress state on damage and failure criteria as well as on evolution equations of damage strains. Different branches are considered corresponding to various micro-mechanisms depending on stress state: growth of voids, formation of micro-shear-cracks and their combination. To be able to get more insight in this complex damage and failure behavior series of three-dimensional micro-mechanical numerical analyses of void containing unit cells have been performed. These calculations cover a wide range of stress states in tension, shear and compression domains. The numerical results are used to show general trends caused by growth and coalescence of micro-defects. They are also used to develop equations for stress-state-dependent damage criteria, to propose evolution equations for damage strain rate tensors, and to introduce a coalescence condition and a fracture criterion formulated in terms of damage strain tensors. (C) 2014 Elsevier Ltd. All rights reserved.