Analysis of Crack Stress Intensity Factor of Coke Drum under Thermal Stress by Weight Function Method

Abstract

The coke drum undergoes severe cyclic temperature changes during service, and it is prone to ring cracks. Based on linear elastic fracture mechanics, this paper uses the weight function method to solve the stress intensity factor of the coke drum with circumferential cracks in a two-dimensional transient temperature field. Based on the edge crack stress intensity factor of the finite width slab, the weight function of the circumferential crack stress intensity factor of the cylindrical shell is deduced according to the self-consistent condition of the crack stress intensity factor and the curvature of the crack mouth opening. Using the weight function obtained, the stress intensity factors of different depth cracks in the coke drum are analyzed, and compared with the results of the literature, the agreement is good. Then, the influence of different liquid rise rates and different thermal conductivity coefficients in the coke drum on the crack stress intensity is analyzed. The influence of factors. The research in this paper lays a theoretical foundation for the prediction of crack propagation and remaining life of the coke drum.