Thermal Stress and Residual Stress of Circular Plate heated at its Centre

Abstract

For the purpose of clarifying the growing mechanism of thermal stress and residual stressdue to welding, we have studied the problem of rectangular plate under one-dimensionalthermal stress. In this report we have dealt with a plastic study of themal stress andresidual stress of circular plate heated at the centre, and it is an example of the problemsof two-dimensional thermal stress.
At high temperature the plate behaves plastic deformation, and when it cools down toroom temperature, residual stress grows in consequence of the restraint of the plastic strain.Under these idea, we have developed the theory. The thermal stresses for every momentarytemperature distribution were calculated by this theory and the residual stress was obtainedfor the last course. These results are shown in Fig. 7 and 8.
On the while, experiments were performed in order to verify our theory; 200 mmφ×6mmcircular plate was heated at its centre by welding and the residual stress was measuredby modified Sachs' method. The experimental value and theoretical one of residual stressare shown in Fig.13, and from this results it was verified that our theory is right.