THE ROLE OF PLASTIC STRAINS IN CREEP CRACK-GROWTH

被引：2

作者：

CHEN, GG ^{[1
]}

HSU, TR ^{[1
]}

机构：

[1] UNIV MANITOBA, DEPT MECH ENGN, WINNIPEG R3T 2N2, MANITOBA, CANADA

来源：

ENGINEERING FRACTURE MECHANICS | 1991年 / 39卷 / 03期

关键词：

D O I：

10.1016/0013-7944(91)90062-6

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This paper presents a computer model for the assessment of crack growth under creep loadings. The model consists of the following special features: (1) the continuum damage constitutive equation for the creep deformation; (2) a multi-yield surface concept for plastic deformation; and (3) the modified "breakable element" technique for simulating creep crack growth. Numerical studies indicate that plastic strains can play a significant role in the growth of cracks induced by creep loadings. Plastic strains near the crack tip can slow down the stress relaxation in that region. This reduced rate of stress relaxation in turn causes faster damage accumulation in the region and slows down the damage evolution in other parts in the structure. Consequently, excessive plastic deformation near the crack tip results in an earlier initiation of crack growth, but with a slower rate of growth thereafter.

引用

页码：493 / 508

页数：16

共 34 条

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