GSO単結晶の熱応力解析

概要

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A three-dimensional finite element computer program was developed to deal with the thermal stress analysis of a gadolinium ortholilicate (Gd_2SiO_5,hereafter abbreviated as GSO), a monoclinic single crystal, during the Czochralski growth process. A GSO single crystal has strong 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 transfomation 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 pulling direction. Using this computer program, we performed the thermal stress analysis of a GSO bulk single crystal for various pulling directions to examine the relationship between the magnitude and distribution of the thermal stress and the pulling directions. The b-axis pulling of a GSO bulk single crystal was proposed from the viewpoint of minimizing thermal stress during the growth process.
社団法人日本機械学会の論文
1997-08-25