高温蠕变裂纹扩展参量Q*(t)及其应用

1.上海市特种设备监督检验所,上海,200437

2.上海市锅炉压力容器检验所,上海,200062

3.华东理工大学化工机械研究所,上海,200237

4.华东理工大学化工机械研究所,上海,200237

Application of Parameter Q * (t) for Correlation of Creep Crack Growth Rate

针对C*参数的不足,本研究修正Q*并得到了一个新的蠕变裂纹扩展速率(CCGR)控制参数Q*(t).该参数综合了温度、应力场、激活能等影响因素,很好地表征了在不同应力或温度条件下蠕变裂纹扩展的特性.该参数能完整关联整个蠕变裂纹扩展的不同阶段,并从材料蠕变断裂的机制上反映了蠕变裂纹扩展的本质.

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