ANALYSIS OF THICK-WALLED ELASTIC-PLASTIC SPHERE SUBJECTED TO TEMPERATURE GRADIENT

摘要

The aim of this work is the study of full thermal cycle (thermal loading and unloading) and the influence of linear hardening coefficients of the material on behavior of thick-walled elastic-plastic sphere subjected to thermal gradient. The influence of thermal cycle and hardening coefficients on the distribution of temperature and strains, on the position of elastic-plastic zone and current stresses, and in particular residual (inner stresses) arisen after the process of elastic unloading is analyzed. The role of residual stresses can be important in estimation of exploitation lifetime of loaded constructions and in analysis of thermal fatigue in loading-unloading thermal cycle. In analysis of the thick-walled sphere, the critical values of sphere geometric parameter β are also determined in the moment of formation of the second plastic zone on outer radius of sphere.