Analysis of Surface Creep Crack Growth Behavior under High Temperature Creep Condition

doi:10.3901/JME.2020.24.040

Abstract

Abstract: The service life of high temperature pressurized equipment is remarkably limited by the existence and propagation of a crack. Unfortunately, the understanding and prediction on the three-dimensional creep crack growth(CCG) behavior of a structure are still very limited. For a typical heat-resistant steel, P91, creep tests under loads of various magnitudes are carried out at 650℃ using a series of tensile specimens containing elaborately prepared surface cracks with various initial length. The surface crack shape evolution is obtained by observing the fracture surfaces. Thereafter, the finite element(FE) analyses of CCG are carried out using a multiaxial creep-damage model. For the purpose of comparison, an FE method on the basis of the C^* parameter and a CCG calculation procedure recommended by the UK standard, BS7910, are also employed. It is found that the finite element solution based on the multiaxial creep-damage model can reasonably describe the final crack profile and show excellent capability in predicting the crack propagation time. In contrast, the FE method using the C^* and the calculation method from BS7910 result in significant deviation in the prediction of the crack shape. In addition, they are relatively dependent on the CCG test data for the compact tension specimen and its fitting parameters, C and q, and may lead to overly conservative predictions of the crack propagation time. The predictive capabilities of different calculation methods on the behavior of surface crack growth under creep condition were examined.

Key words: creep crack growth, surface crack, creep damage, finite element analysis, heat-resistant steel

CLC Number:

TH114

HU Huayan, WEN Jianfeng, WU Weifeng, TAN Jianping, TU Shantung. Analysis of Surface Creep Crack Growth Behavior under High Temperature Creep Condition[J]. Journal of Mechanical Engineering, 2020, 56(24): 40-50.

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