Abstract
Leakage-before-break technique is widely used in high energy pipeline of nuclear plant, for which crack stability of pipeline under complex loading condition is a key issue, and crack growth resistance curve of pipeline material is the important foundation for crack stability analysis. In this paper, ferritic steel A533B is studied, Gurson damage model is used to simulate crack process of contact tension specimen under unitension, and effect of Gurson model parameter on simulation result is discussed. The following results are found during simulation: initial porosity factor is the main parameter, when it increases gradually, unstable crack extension will be observed; however, only initial J toughness is affected by critical porosity factor; the minor parameter is load step control, when it increases, stable and convergent result is obtained. All results in this paper can be used to determine parameters in Gurson mode, which will be foundation for crack extension analysis of pipeline.
Highlights
In present, leakage-before-break (LBB) technique is widely used for collant pipeline in most operating and abuilding nuclear plants
Contact tension specimen made of ferritic steel A533B is studied in this paper, Gurson model is combined to describe micro fracture process in A533B material, and effect of Gurson model parameter on simulation results is analyzed by finite element method
Initial porosity is assumed as f0, when material is loaded, bigger porosity is formed by connection of smaller porosity, and new crack surface is obtained at the same time
Summary
Leakage-before-break (LBB) technique is widely used for collant pipeline in most operating and abuilding nuclear plants. Since austenitic steel with high toughness is used for nuclear pipeline, elastic-plastic fracture is the main failure mode. Elastic-plastic fracture is a complex process, and fracture toughness JIC cannot be adapted directly to fracture analysis in complex structure [1]. Gurson model is proved to simulate fracture process well for metallic material from a lot of tests and theoretic studies [4]. Contact tension specimen made of ferritic steel A533B is studied in this paper, Gurson model is combined to describe micro fracture process in A533B material, and effect of Gurson model parameter on simulation results is analyzed by finite element method
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