MODELING FATIGUE CRACK-GROWTH AND COALESCENCE IN NOTCHES

被引：15

作者：

FRISE, PR

BELL, R

机构：

[1] Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 1992年 / 51卷 / 01期

关键词：

Fracture Mechanics - Steel--Crack Propagation;

D O I：

10.1016/0308-0161(92)90008-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An experimental and analytical study of the process of fatigue crack growth and coalescence in the region of a notch has been performed. The experimental program consisted of constant amplitude fatigue tests of 24 V-notched steel bar specimens, 11 of which had two starter cracks designed to simulate crack coalescence. The results of the experimental program are presented and compared to computer predictions of fatigue crack growth. These were produced by software that performs an integration of the Paris crack growth law and incorporates a new crack shape development and crack coalescence model. It has been found in the present study that pre-coalescence interaction between adjacent cracks is not evident and, in fact, that coalescence itself is not an instantaneous process. This result is of interest because it is at variance with the existing design codes that deal with the case of adjacent collinear fatigue cracks.

引用

页码：107 / 126

页数：20

共 28 条

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