Load sequence effects on the fatigue crack growth in a cylinder subjected to combined rotary bending moment and axial force loads

被引：5

作者：

Ngoc Ha Dao ^{[1
]}

Minh Ngoc Vu ^{[2
]}

机构：

[1] DrillScan, 26 Rue Emile Decorps, F-69100 Villeurbanne, France

[2] Duy Tan Univ, R&D Ctr, Da Nang, Vietnam

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2016年 / 82卷

关键词：

Fatigue crack growth; Rotary bending moment; Axial force load; Circumferential semi-elliptical surface crack; Load level independence; Load sequence independence; STRESS INTENSITY FACTORS; CIRCUMFERENTIAL SURFACE FLAWS; TIME-DERIVATIVE EQUATIONS; FRACTURE-MECHANICS; PIPES; METALS; PROPAGATION; PREDICTION; BEHAVIOR; MODEL;

D O I：

10.1016/j.tafmec.2015.12.011

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This study used a fatigue crack growth model of a semi-elliptical external surface crack in a hollow cylinder subjected to a combination of rotary bending moment and axial force. In the literature, several authors have explored the problem of crack growth in a hollow cylinder but only for each loading case separately: cyclic tension, rotary bending and cyclic bending. Furthermore, no one has studied the effect of load sequence for this case of structure and loading. In this paper, the study shows the evolution of crack geometry during loading cycles seemingly depends only on accumulated life fraction of the already applied cycles (life fraction is the ratio of the number of load cycles N and the crack growth life NR corresponding to the constant cyclic loading). Therefore, the fatigue crack growth is independent of the load level and the load sequence. This remark can be used to explain the damage accumulation models in fatigue based on life fraction. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：117 / 124

页数：8

共 35 条

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