Abstract
In order to provide the basis for research on the cause of an explosion accident of a waste heat boiler, thermal elastic and elasto-plastic stress analysis of the structural component containing a supporting cone shell has been performed. In this paper, an iterative method is proposed for the solution of the reaction on the structure component. An elasto-plastic axisymmetric finite element program, which is suitable for use on a personal computer, has been developed and proved by a standard numerical example. The elasto-plastic stress analysis of the region of the thermal elastic stress peak has been implemented by application of the program. The result shows that high plastic stress exists in the weld joining the inner shell and the supporting cone shell. This proves that production of high creep rate and serious creep damage in the region is inevitable, which coincides with the appearance of the structure failure.
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