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Effect of stress dependent creep ductility on creep crack growth behaviour of steels for wide range of C

机译：应力依赖性蠕变延展性对宽范围C时钢蠕变裂纹扩展行为的影响

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摘要

In this work, the effect of stress dependent creep ductility on the creep crack growth (CCG) behaviour of steels has been investigated by finite element simulations based on ductility exhaustion damage model. The relationship between the transition region of creep ductility and the transition behaviour of CCG rate on da/dt-C* curves has been examined and the CCG life assessments of components and CCG resistance of materials for a wide range of C* were discussed. The results show that with increasing the transition region size of creep ductility, the transition C* region size on da/dt-C* curves increases. With moving transition region position of creep ductility to high stress region (increasing transition stress levels), the transition C* region on the da/dt-C* curves also moves to high C* region. Decreasing transition stress levels and transition region sizes of creep ductility and increasing the lower shelf and upper shelf creep ductility values can improve the CCG resistance of materials. If the extrapolation CCG rate data from the high C* region or from the transition C* region are used in life assessments of the components at low C* region, the non-conservative or excessive conservative results may be produced. Therefore, the CCG rate data should be obtained for a wide range of C* by long term laboratory tests or numerical predictions using the stress dependent creep ductility and model.
机译：在这项工作中，基于延性疲劳破坏模型的有限元模拟研究了应力依赖性蠕变延展性对钢的蠕变裂纹扩展（CCG）行为的影响。在da / dt-C *曲线上研究了蠕变延性过渡区域与CCG速率过渡行为之间的关系，并讨论了在宽范围C *下材料的CCG寿命评估和材料的CCG电阻。结果表明，随着蠕变延性过渡区域尺寸的增加，da / dt-C *曲线上的过渡C *区域尺寸增加。随着蠕变延性的过渡区域位置移动到高应力区域（过渡应力水平增加），da / dt-C *曲线上的过渡C *区域也移至高C *区域。减小过渡应力水平和蠕变延性的过渡区域大小以及增加下层和上层的蠕变延展性值可以提高材料的CCG抵抗力。如果将高C *区域或过渡C *区域的外推CCG速率数据用于低C *区域的组件的寿命评估，则可能会产生非保守或过度保守的结果。因此，应通过长期的实验室测试或使用与应力有关的蠕变延性和模型进行数值预测，获得宽范围C *的CCG速率数据。

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