The remaining life for a hypothetical pressure vessel containing a defect which is subject to thermal shock has been calculated. Twelve cases of thermal shock loads of different severity characterized by the dimensionless parameters, Biot (B) and Fourier (F) numbers, were analysed by finite element modelling (FEM). The estimation of remaining life for each case was carried out based on the PD6493 defect assessment procedure (1). The effect of thermal shock on the crack growth rate was quantified showing that more severe shocks accelerate crack growth while less severe shocks may lead to slow growth or eventual crack arrest.
KobayashiA. S.PolvanichN.EmeryA. F.LoveW. J.Stress intensity factors of corner cracks in two nozzle-cylinder intersections. 4th SMiRT, 1977, paper 4/4.
5.
MillerA. G.Review of limit loads of structures containing defects. Int. J. Pressure Vessels and Piping, 1988, 32, 197–327.
