用带预裂纹的缺口试件研究225Cr1Mo 钢高温低周疲劳裂纹扩展规律，通过疲劳试验观察裂纹扩展寿命，应用ANSYS计算裂纹尖端应力应变分量和当量弹、塑性应变范围，利用当量J积分范围表征225Cr1Mo 钢在复杂应力状态下的低周疲劳裂纹扩展速率。结果表明：疲劳裂纹扩展速率da/dN与当量J积分范围ΔJf的关系不受试件缺口型式和加载应变范围的影响，用当量J积分来评价225Cr1Mo 钢的高温低周疲劳裂纹扩展规律是有效的。
The crack propagation law of 225Cr1Mo steel was researched with notched cylinder specimen under the condition of high temperature lowcycle fatigue. The crack propagation life was viewed by fatigue experiment and the equivalent stressstrain on the crack tip was calculated by the ANSYS. The equivalent Jintegral range which was computed by equivalent elastic and plastic strain ranges was employed to denote the fatigue crack propagation rate. The results showed that crack propagation law of this material in complex stress state can be characterized by equivalent Jintegral ranges and the relation between da/dN and ΔJf is not influenced by the type of notch and the load strain range.
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