摘要
利用超声疲劳试验设备对LZ50钢进行变幅疲劳性能的研究同时用扫描电子显微镜(SEM)观察分析了疲劳断口的形貌特征。试验采用荷载步线型累加的加载形式,选取最大荷载σhigh为390 MPa。结果表明:经过小荷载作用后的实验材料其疲劳性能有显著增强,表现出明显的Coaxing效应;引入强化因子对Palmgreen-Miner累积损伤准则进行修正,经修正后的Palmgreen-Miner累积损伤准则能较好地预测材料使用工况下的变幅寿命。
Variable amplitude fatigue properties of LZS0 steel were investigated with ultrasonic fatigue testing equipment. Fatigue tests were performed with a linear step accumulative loading. The maximum stress was selected at 390 MPa. The fracture surfaces of specimens were investigated with scanning electron microscopy （SEM）. The experimental results show a marked Coaxing effect. The Palmgreen-Miner damage formula was verified based on the step-loading fatigue experiment result of LZS0 steel. It is indicated that the calculation result of the formula is of higher precision and it approaches the experimental result.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2014年第1期12-14,共3页
Ordnance Material Science and Engineering
基金
国家自然基金资助(10872175)
