TITLE:
Effect Analysis of Gurson Model Parameters on Crack Extension of Pipeline
AUTHORS:
Tieping Li, Xinlu Tian
KEYWORDS:
Leakage-Before-Break; Crack Growth Resistance Curve; Gurson Damage Model; Crack Extension
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.1 No.6,
December
3,
2013
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.