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工程力学  2015 

基于等效全程单轴本构关系的应力三轴度分析

DOI: 10.6052/j.issn.1000-4750.2014.04.S026, PP. 27-32

Keywords: 等效单轴全程本构关系,FAT方法,拉伸,应力三轴度,颈缩

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Abstract:

该文利用有限元辅助测试(FiniteelementAidedTesting,FAT)方法测得了四种工程材料的等效全程单轴本构关系,基于此全程本构关系对拉伸过程中漏斗试样的应力三轴度演化进行了有限元分析,并同基于Bridgman应力修正后的单轴本构关系得到的漏斗试样漏斗根部截面中心处应力三轴度计算公式结果进行了比较。得到了四种材料的等效全程单轴本构关系、破断应变、破断应力和漏斗根部截面上应力三轴度分布随截面中心Von-Mises等效应变的变化规律。同时基于三轴度理论还讨论了漏斗型试样的拉伸破断机理以及断口的形貌。

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