Influence of Strain History on Ductile Failure of Steel
Influence of Strain History on Ductile Failure of Steel
复制标题
应变历史对钢延展性破坏的影响
DOI：
10.1051/jp4:1996603
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
W. Dahl
中科院分区：
文献类型：
--
作者：
J. Arndt;H. Majedi;W. Dahl
对高强度结构钢缺口拉伸试件进行了孔洞合并加载试验。结果表明，用径向加载试件确定的损伤曲线对非径向加载试件不适用。不同载荷历史的缺口拉伸试件试验结果表明，单一的损伤参数判据不足以描述孔洞的初始合并过程。的形状的空隙和三轴度在启动表现出强烈的影响的初始值。有两种方式来描述开始。一个简单的一个考虑的临界组合的空隙增长率，三轴度和塑性应变在启动。另一种是用形状因子来描述孔洞的形状并计算初始值。这两种模型的工作精度在实验散射的顺序。
Notched tensile bars of a high strength structural steel were loaded to void coalescense. The results show that the damage curve determined using radially loaded specimens is not valid for specimens under non-radial loading. The results of the experiments with different load histories of notched tensile bars show, that a single parameter criterion like a damage parameter is not sufficient to describe the initiation process of void coalescense. The shape of the voids and the triaxiality at initiation exhibit a strong influence on the initation values. There are two ways to describe the initiation. A simple one considers a critical combination of void growth rate, triaxiality and plastic strain at initiation. The other one uses a shape factor to describe the shape of the voids and calculates the initiation values. Both models work with an accuracy in the order of the experimental scatter.