弹性模量在用柔度法测量疲劳裂纹长度中的影响

Effect of Elastic Modulus on Fatigue Crack Length Measurement by Using Compliance Technique

用不同整体刀口设计的三点弯曲SE(B)试样做了两组疲劳裂纹扩展速率 (FCGR)试验 ,分析了弹性模量在柔度法测量疲劳裂纹长度中的影响。结果表明 ,用柔度法测量的弹性模量值偏大或偏小 ,都将影响到lg(da dN) lgΔK曲线的准确性 ,为在FCGR试验中采用SE(B)试样时整体刀口设计类型的选择提供了试验依据。

Two series of fatigue crack growth rate (FCGR) tests using three point bend specimen with different integral knife edge designs are performed. Effect of elastic modulus on the measurement of fatigue crack length using compliance technique is analyzed.The results show that both positive and negative deviation of the elastic modulus from real value in the measurement with compliance technique will influence the accuracy of lg(d a /d N ) lgΔ K curve providing an experiment back for selecting the type of integral knife edge of the three point bend specimen in FCGR test.