Abstract: 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. The C(t) integral, which represents the stress and strain rate field at the crack tip, was investigated by simulations. The influence of the constraint effect of P92 steel on the creep crack growth was studied based on the parameter Ac using finite element analysis, and the result of which was compared with experimental data. Firstly, the results showed that the value of the C(t) integral decreased sharply as the crack propagated and the C(t) integral was affected by the distance from the crack tip strongly and was affected by the constraint effect to some extent. Secondly, the study indicated that the constraint effect had an influence on the creep crack growth rate and a higher constraint resulted in a faster creep crack growth rate. Finally, it was testified that the parameter Ac was effective in evaluating the constraint level at the crack tip. The utilization of parameter Ac in predicting the service life needed further exploration, which had a great significance in evaluating the lifetime of the defected components working under high temperature.
田兰兰, 刘军, 何滨, 陈建恩, 王肖锋, 葛为民. 基于C(t)积分及参数Ac的P92钢高温蠕变裂纹扩展研究*[J]. 《材料导报》期刊社, 2017, 31(18): 141-145.
TIAN Lanlan, LIU Jun, HE Bin, CHEN Jianen, WANG Xiaofeng, GE Weimin. Investigation of Creep Crack Growth of the P92 Steel Under High Temperature Based on the C(t) Integral and Parameter Ac. Materials Reports, 2017, 31(18): 141-145.
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2017, Vol. 31 
