理化检验-物理分册2017，Vol.53Issue(10)：712-716,5.DOI:10.11973/lhjy-wl201710004
预制疲劳裂纹应力强度因子幅对超高强度钢断裂韧度的影响
Effects of Stress Intensity Factor Range for Fabricating Fatigue Pre-cracks on Fracture Toughness of Ultra-High Strength Steel
摘要
Abstract
The quasi-static fracture toughness (KⅠC )test of D406A ultra-high strength steel was carried out by using multi-sample method,the effects of stress intensity factor range for prefabricating fatigue crack on the fatigue pre-crack propagation cycle, fatigue pre-crack propagation rate, fracture surface morphology and ultimate fracture toughness were investigated.The results show that the fatigue pre-crack propagation cycle and rate were both of an exponential relationship with the stress intensity factor range,and the fatigue crack spacing on the fracture samples and the final fracture toughness increased with the increase of stress intensity factor ranges.If the maximum stress intensity factor was selected in the range of (20%-30%)KⅠC of the material,the KⅠC test results would be relatively stable.关键词
疲劳预裂纹/应力强度因子幅/超高强度钢/疲劳裂纹扩展速率/断裂韧度Key words
fatigue pre-crack/stress intensity factor range/ultra-high strength steel/fatigue crack propagation rate/fracture toughness分类
矿业与冶金引用本文复制引用
刘晓菊,刘许龙,薛庆贺..预制疲劳裂纹应力强度因子幅对超高强度钢断裂韧度的影响[J].理化检验-物理分册,2017,53(10):712-716,5.
