Fatigue crack propagation behavior of specimens with multiple parallel edge notches at regular intervals

被引：0

作者：

Kagawa, Hiroyuki ^{[1
]}

Morita, Akira ^{[1
]}

Matsuda, Takuji ^{[1
]}

Kubo, Shiro ^{[1
]}

机构：

[1] Kansai Electric Power Co., Inc., Technical Research Center, Amagasaki-shi, Hyogo, 661-0974

来源：

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A | 2006年 / 72卷 / 10期

关键词：

4-points bending; Crack interval; Crack propagation; Eccentric tension compression; Fatigue; Finite element analysis; Influence coefficient; Multiple cracks; Stress intensity factor;

D O I：

10.1299/kikaia.72.1533

中图分类号：

学科分类号：

摘要：

Fatigue crack propagation tests were performed using specimens with multiple parallel edge notches at regular intervals. Fatigue pre-cracks of uniform length were successfully introduced by eccentric tension-compression loading at ten odd notches located in central part of the specimen. After pre-cracking, fatigue crack propagation tests were carried out under 4-points bending loading. Central eleven cracks of the specimen were located within the inner span of bending in which the bending stress was kept constant. These eleven cracks propagated at almost the same rate when the cracks were relatively short. After the cracks grew a few milli-meters, however, the propagation rate of some cracks was selectively accelerated while that of the other cracks decelerated. In addition, a series of finite element analyses were performed for multiple edge cracks whose lengths were different alternately. Stress intensity factor solution for these cracks was developed and utilized to simulate experimental results. As a result, the developed solution could successfully simulate the complex propagation behavior of the multiple cracks.

引用

页码：1533 / 1541

页数：8

共 3 条

[1] Morita A., Et al., Evaluation of Multiple Crack Propagation Behavior in a Gas Turbine Blade under Thermal Fatigue Condition, Transactions of the Japan Society of Mechanical Engineers, Series A, 71, 709, pp. 1213-1219, (2005)
[2] Fatigue Crack Propagation Properties in Arc-Welded Butt-Joints of High Strength Steels for Welded Structure, NRIM Fatigue Data Sheet Technical Docwment, 3, (1984)
[3] Anderson T.L., Et al., Development of Stress Intensity Factor Solutions for Surface and Embedded Cracks in API519, Welding Research Council Bulletin, 471, (2002)

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