Micro-mechanical studies on the effect of the stress triaxiality and the Lode parameter on ductile damage
Micro-mechanical studies on the effect of the stress triaxiality and the Lode parameter on ductile damage
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DOI：
10.1016/j.ijplas.2013.03.012
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发表时间：
2013-11-01
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
本文研究了应力状态对韧性金属损伤行为的影响。将连续损伤模型推广到考虑应力状态对损伤准则和损伤应变演化方程的影响。根据应力强度、应力三轴度和矿脉参数，不同的分支被认为对应于不同的损伤机制。基本的材料参数确定不同缺口拉伸和剪切试样的实验。为了能够得到更多的洞察力在复杂的损伤和破坏行为的附加系列的三维微观力学数值分析包含单元电池的空洞已经执行。这些计算涵盖了拉伸、剪切和压缩域中的各种应力三轴度和矿脉参数。数值结果被用来显示一般的趋势，发展方程的损伤准则，提出损伤应变的演化方程，并确定参数的连续模型。(C)2013爱思唯尔有限公司保留所有权利。
The paper deals with the effect of stress state on the damage behavior of ductile metals. The continuum damage model has been generalized to take into account the effect of stress state on damage criteria as well as on evolution equations of damage strains. Different branches are considered corresponding to various damage mechanisms depending on stress intensity, stress triaxiality and the Lode parameter. Basic material parameters are identified using experiments with differently notched tension and shear specimens. To be able to get more insight in the complex damage and failure behavior additional series of three-dimensional micro-mechanical numerical analyses of void containing unit cells have been performed. These calculations cover a wide range of stress triaxialities and Lode parameters in the tension, shear and compression domains. The numerical results are used to show general trends, to develop equations for the damage criteria, to propose evolution equations of damage strains, and to identify parameters of the continuum model. (C) 2013 Elsevier Ltd. All rights reserved.