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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录刊物：SCIE、EI、Scopus

卷号：41

期号：1

页面范围：29-40

ISSN号：8756-758X

关键字：compressive load effect; crack opening stress; finite element analysis; maximum crack opening displacement; tension-compression loading

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.