Abstract
A three-dimensional finite element computer code was developed to deal with the thermal stress analysis of tetragonal single crystals. They have crystal anisotropy in the elastic constants and thermal expansion coefficients, so three-dimensional analysis is required for the exact calculation of the thermal stress. A tensor transformation technique was used to obtain the components of the elastic constant matrix and the thermal strain or thermal expansion coefficient vector corresponding to an arbitrary growth direction. Using this computer program, we performed the thermal stress analysis of a PMO (PbMoO_4) bulk single crystal for various growth directions. The relationship between the thermal stress and the crystal quality was discussed.
