Abstract: Disclosed is a method of predicting a failure probability of a brittle material in a high temperature creep state. Based on the prior art, assuming that an uniaxial creep failure strain obeys Weibull Distribution in combination with a natural attribute of random distribution of internal defects of the brittle material, a probability density distribution curve of the uniaxial creep failure strain is obtained by using an uniaxial creep test, and a probability density function of a multiaxial creep failure strain is obtained based on a conversion relationship of uniaxial and multiaxial creep failure strains and further a calculation model of a failure probability is obtained by integration; based on this, a prediction result of a failure probability of the brittle material in the high temperature creep state is obtained by writing a sub-program by using a Fortran language and embedding the sub-program into a finite element software in combination with a creep-damage constitutive equation.

Abstract: A design method for creep-fatigue strength of a plate-fin heat exchanger. The method includes preliminarily designing the plate-fin heat exchanger according to its service requirements, making a primary stress assessment for the plate-fin heat exchanger, calculating the equivalent mechanical and thermophysical parameters of the plate-fin heat exchanger core to satisfy the allowable stress requirement, performing a thermal fatigue analysis for the plate-fin heat exchanger based on these parameters and then calculating the fatigue life and creep life of the plate-fin heat exchanger to accomplish the comprehensive design of the plate-fin heat exchanger in the high-temperature service. The design method provides an effective method for the high temperature design of the plate-fin heat exchanger.

Abstract: A design method for creep-fatigue strength of a plate-fin heat exchanger. The method includes preliminarily designing the plate-fin heat exchanger according to its service requirements, making a primary stress assessment for the plate-fin heat exchanger, calculating the equivalent mechanical and thermophysical parameters of the plate-fin heat exchanger core to satisfy the allowable stress requirement, performing a thermal fatigue analysis for the plate-fin heat exchanger based on these parameters and then calculating the fatigue life and creep life of the plate-fin heat exchanger to accomplish the comprehensive design of the plate-fin heat exchanger in the high-temperature service. The design method provides an effective method for the high temperature design of the plate-fin heat exchanger.