Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2019 - September 11, 2019
It may be necessary to evaluate whether a detected crack is harmful or not, in order to perform safe and reasonable operation in high-temperature plant equipment such as thermal power plants. Fatigue crack propagation can be evaluated using the fatigue J integral range and the associated crack propagation law. On the other hand, experimental verifications of thermal fatigue crack propagation analysis are limited because of the difficulty of performing experiments. This study has been conducted for obtaining an example of V&V (Verification and Validation) of a crack propagation simulation program developed in the past study by comparing the simulation with previously performed thermal crack propagation tests. The tests were performed using a type 304 stainless steel cylinder which contained semi-elliptical pre-notches introduced by electric discharge machining. Cyclic thermal loads were applied to the specimen by alternately contacting hot and cold lead-bismuth liquid metal chambers on the specimen surface. It has been confirmed that the simulation program resulted in conservative predictions by considering temperature dependence of material properties and using stress intensity factor solutions for cylindrical shaped bodies.
