Abstract
The stress concentration factors and stress intensity factors evaluated by thermoelastic stress analysis method were lower than the comparable values calculated by the finite element method (FEM), and the error increased in proportion to those values regardless of the stress ratio. In this study, the sources of the error between experimental results and numerical values were investigated in order to improve the accuracy of thermoelastic stress analyses. Since the major source was supposed to be the effect of heat conduction in specimens, the unsteady heat conduction analyses were conducted for three types of center holed specimens and center crack tension (CCT) specimens. According to the comparison between experimental results and numerical values, it was found that stress concentration factors were affected by heat conduction especially under 10Hz, but the errors of stress intensity factor were caused not by heat conduction but by the plastic zone size of a crack tip.
