【摘要】 通过对 2 .2 5Cr 1Mo材料进行不同温度下的低周疲劳试验 ,并应用NHRDS有限元程序进行裂纹尖端各应力应变分量 ,各当量弹、塑性应变范围的计算 ,利用当量J积分范围 ,研究了该材料在复杂应力状态下的低周疲劳裂纹扩展规律。结果表明 ,在复杂应力状态下 2 .2 5Cr 1Mo材料的低周疲劳裂纹扩展速率可采用当量J积分范围进行表征更多还原

【Abstract】 Low cycle fatigue tests were carried out on 2.25Cr 1Mo steel notched cylinder specimens under strain range control at three different temperatures. The three dimension stressed and strains within the specimens were calculated by the NHRDS(two surface model within non harden region) program. The equivalent stress ranges, equivalent elastic and plastic strain ranges at the crack tip were used to compute equivalent J integral ranges which were employed to study the fatigue crack propagation. The results showed that crack propagation rate of this material under complex stress state can be characterized by the equivalent J integral range.更多还原