A new expression for crack opening stress determined based on maximum crack opening displacement under tension-compression cyclic loading

被引：2
|
作者：
Chen, J. J. [1 ]
You, M. [1 ]
Huang, Y. [1 ]
机构：
[1] Dalian Univ Technol, Sch Naval Architecture, Dalian 116024, Liaoning, Peoples R China
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2018年 / 41卷 / 01期
基金：
中国国家自然科学基金;
关键词：
compressive load effect; crack opening stress; finite element analysis; maximum crack opening displacement; tension-compression loading; FINITE-ELEMENT-ANALYSIS; PROPAGATION MODEL; GROWTH-BEHAVIOR; R-RATIO; CLOSURE;
D O I：
10.1111/ffe.12637
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The maximum crack opening displacement is introduced to investigate the effect of compressive loads on crack opening stress in tension-compression loading cycles. Based on elastic-plastic finite element analysis of centre cracked finite plate and accounting for the effects of crack geometry size, Young's modulus, yield stress and strain hardening, the explicit expression of crack opening stress versus maximum crack opening displacement is presented. This model considers the effect of compressive loads on crack opening stress and avoids adopting fracture parameters around crack tip. Besides, it could be applied in a wide range of materials and load conditions. Further studies show that experimental results of da/dN-K curves with negative stress ratios could be condensed to a single curve using this crack opening stress model.
引用
收藏
页码：29 / 40
页数：12
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