2008 Volume 8 Issue 4 Pages 396-401
Until now, the effect of the three-dimensional heat-conduction has been discussed by paying attention to the thickness change of a specimen. A temperature gradient increases by the increase in the three-dimensional stress gradient accompanying the increase in specimen thickness and a load. Therefore, it becomes impossible to ignore the effect of the heat conduction in the thickness direction, and it can be said that analytic accuracy falls. The effect of the heat conduction to the image of the sum of the principal stresses decreases with an increase in the frequency of a cyclic load. Then, the improvement in analytic accuracy was paid attention by changing the frequency of a cyclic load in this experiment. Therefore, in modification of the sum of the principal stresses by two-dimensional non-steady heat-conduction inverse analyses, a very accurate result was obtained at the frequency of 20Hz or more. Heat-conduction direct problem simulation when giving a cyclic load (20Hz and 25Hz) was carried out in two-dimensional analyses and three-dimensional analyses, and it was discussed whether it is possible to minimize the effect of three-dimensional heat conduction.
