航空学报 > 1992, Vol. 13 Issue (11): 698-701

不同应力三维度下空穴缩胀的模拟计算与分析

岳珠峰, 张克实, 郑长卿   

  1. 西北工业大学工程力学系 西安 710072
  • 收稿日期:1990-12-18 修回日期:1991-10-22 出版日期:1992-11-25 发布日期:1992-11-25

THE COMPUTER SIMULATION AND ANALYSIS OF VOID GROWTH IN DIFFERENT STRESS TRIAXIALITIES

Yue Zhu-Feng, Zhang Ke-Shi, Zheng Chang-qing   

  1. Department of Applied Mechanics, Northwestern Poly technical University, Xi' an, 710072
  • Received:1990-12-18 Revised:1991-10-22 Online:1992-11-25 Published:1992-11-25

摘要:

用弹塑性大变形有限元方法对含微空洞的40 Cr材料制轴对称拉伸试件进行了模拟计算与分析,表明空穴沿轴向和径向长大规律的不同,主要表现在对应力三维度水平的依赖程度不一样;在所考察的范围内,空穴横纵扩张比与应力三维度成线性关系。该计算模型在一定程度上反映了真实试件中的空穴变形情况,简单推算表明它在一定程度上也能反映裂纹体裂端空穴长大规律,并有可能用于估计材料的韧脆转变的研究。

关键词: 空穴扩张, 计算模拟, 应力三维度, 损伤与破坏

Abstract:

In the paper, the analysis of the void enlargement during the deformation of axisymmetric tensile specimens made of alloy steel 40Cr has been carried out by employing a larg elastic-plastic deformation finite element program. The result obtained shows that the void expands differently in the longitudinal and in the radial directions, and the stress triaxiality plays an important role on it.The ratio of void increment in radial direction to that in longitudinal direction is found to be a linear function or the stress triaxiality. All the calculations are not far away from the results of the experiments of the same alloy. The extrapolated value of void growth is reasonably agreeable to the 3-D analysis of void growinq in the crack tIp field, and maybe the model can be used to study the Ductile-Brittle transition.

Key words: void growth, computer simulation, stress triaxialuy damage and failure