A modification of UniGrow 2-parameter driving force model for short fatigue crack growth

被引：36

作者：

Bang, D. J. ^{[1
]}

Ince, A. ^{[1
,2
]}

Tang, L. Q. ^{[1
]}

机构：

[1] Purdue Univ, Purdue Polytech Inst, W Lafayette, IN 47907 USA

[2] Concordia Univ, Dept Mech Ind & Aerosp Engn, Montreal, PQ, Canada

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2019年 / 42卷 / 01期

关键词：

fatigue crack growth rates; high cycle fatigue; long crack; short crack; stress intensity factor; UniGrow model; STRESS CORRECTION MODEL; MEAN STRESS; LIFE PREDICTIONS; PROPAGATION; BEHAVIOR; CLOSURE; THRESHOLD; NOTCHES; ALLOYS; RATIO;

D O I：

10.1111/ffe.12865

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In this paper, a modification of the UniGrow model is proposed to predict total fatigue life with the presence of a short fatigue crack by incorporating short crack propagation into the UniGrow crack growth model. The UniGrow model is modified by 2 different methods, namely the "short crack stress intensity correction method" and the "short crack data-fitting method" to estimate the total fatigue life including both short and long fatigue crack propagations. Predicted fatigue lives obtained from these 2 methods were compared with experimental data sets of 2024-T3, 7075-T56 aluminium alloys, and Ti-6Al-4V titanium alloy. Two proposed methods have shown good fatigue life predictions at relatively high maximum stresses; however, they provide conservative fatigue life predictions at lower stresses corresponding high cycle fatigue lives where short crack behaviour dominates total fatigue life at lower stress levels.

引用

页码：45 / 60

页数：16

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