Instability criterion of materials in combined stress states and its application to orthogonal cutting process
Instability criterion of materials in combined stress states and its application to orthogonal cutting process
复制标题
复合应力状态材料失稳判据及其在正交切削加工中的应用
DOI：
10.1016/j.ijplas.2011.09.003
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发表时间：
2012-03-01
影响因子：
9.8
通讯作者：
Ling, Zhong
中科院分区：
文献类型：
--
作者：
Ma, Wei;Li, Xiangwang;Ling, Zhong
变组合应力作用下，材料会发生剪切局部化失稳或非局部化热软化失稳。本文的目的是对复合应力加载条件下材料的失稳行为进行理论分析，并应用分析结果解释切削过程中切屑材料的去除机理。首先对复合应力加载条件和相对临界条件下的材料失稳进行了摄动分析，然后讨论了材料失稳行为与加载条件的关系。通过数值模拟研究了切削过程中切屑材料的去除机理。连续切屑和不连续切屑的形成与切屑材料的塑性流动和失稳行为密切相关，两种切屑的转化取决于膨胀变形耗散的塑性功与剪切变形耗散的塑性功之比。(C)2011爱思唯尔有限公司版权所有。
The loadings of variable combined stresses may cause different instabilities of materials such as the shear localization instability or non-localized thermal softening instability. The purpose of this paper is to present a theoretical analysis of instability behaviors of material under the loading conditions of combined stresses and apply the analytical results to interpret the removal mechanisms of chip materials in cutting process. First, the perturbation analysis of material instability under the loading conditions of combined stresses and relatively critical conditions are presented, followed by discussions on relations between the instability behaviors of materials and the loading conditions. Then, the removal mechanisms of chip materials in cutting process are studied by numerical simulation. The formation of continuous and discontinuous chips is shown closely related to the plastic flow and instability behaviors of the chip material, and the transformation between the two types of chips is found dependent on the ratio of plastic work dissipated by dilatation deformation and that dissipated by shear deformation. (C) 2011 Elsevier Ltd. All rights reserved.