傾斜機能材料をインサート材とする複合円筒の動的熱応力解析

This paper is concerned with the dynamic treatment of thermal stresses in a ceramic-metal composite hollow circular cylinder with an interlayer of functionally graded material (FGM) subjected to uniform impulsive electromagnetic radiation. Heating is assumed to be a step function in time, and to diminish exponentially with distance from the inner surface of the cylinder, assuming negligible heat conduction. In treating problems, the nature of the stress-wave buildup in the absorption cylinder is studied for the case of a temperature-dependent solid, i. e., material properties vary with temperature. The nonhomogeneous hollow circular cylinder is approximated as a laminated hollow circular cylinder consisting of different, homogeneous and isotropic cylindrical layers which are perfectly bonded to each neighboring layer. The numerical procedure employs the characteristic method based on the integration of the governing equations along the characteristics. Numerical examples are presented for several cases, which show the significance of the temperature-dependent properties of the material and the effects of the thickness and composition distribution of the FGM interlayer on the magnitude of the dynamic thermal stresses