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首页> 外文会议>IEEE International Conference on Mechatronics and Automation >Investigation of the constraint effect of the P92 steel under high temperature based on the parameter Ac and creep strain
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Investigation of the constraint effect of the P92 steel under high temperature based on the parameter Ac and creep strain

机译：基于参数Ac和蠕变应变研究P92钢在高温下的约束效应

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Creep crack growth is a major failure mechanism of components working under high temperature, and the constraint effect at the crack tip has significant influence on the creep crack growth rate. In this paper, the influence of the constraint effect of P92 steel on the creep crack growth was studied based on the parameter A and the creep strain at the crack tip. The result of the finite element analysis was compared with experimental data. The study revealed that the parameter A was effective in evaluating the constraint level at the crack tip, which has a great significance in evaluating the lifetime of the defected components working under high temperature. In addition, during the propagation of creep crack growth, the area of creep strain increased quickly while the area of elastic strain decreased quickly. The plastic strain stayed nearly constant and increased very slowly. During the later stage of the steady state and the tertiary creep step, the creep strain was distributed at the full area of the crack tip region and the elastic strain had only an extremely small area left.
机译：蠕变裂纹扩展是构件在高温下工作的主要失效机理，裂纹尖端的约束效应对蠕变裂纹扩展速率有显着影响。本文基于参数A和裂纹尖端的蠕变应变，研究了P92钢的约束效应对蠕变裂纹扩展的影响。有限元分析的结果与实验数据进行了比较。研究表明，参数A在评估裂纹尖端的约束水平方面是有效的，这对于评估在高温下工作的缺陷部件的寿命具有重要意义。另外，在蠕变裂纹扩展的传播过程中，蠕变应变的面积迅速增加，而弹性应变的面积迅速减小。塑性应变几乎保持恒定，并且增长非常缓慢。在稳态和第三蠕变步骤的后期，蠕变应变分布在裂纹尖端区域的整个区域，而弹性应变只剩下很小的区域。

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