Inverse Analysis Related to Stress Separation in Thermoelastic Stress Analysis.

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  • 熱弾性応力測定における主応力分離に関する逆問題解析
  • ネツ ダンセイ オウリョク ソクテイ ニ オケル シュオウリョク ブンリ ニ
  • Inverse Analysis Related to Stress Sepa

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This paper deals with stress separation in thermoelastic stress analysis. The problem of stress separation can be divided into two : (1) an inverse problem to estimate the unknown boundary values from the sum of the principal stresses inside the body, and (2) a direct problem to compute the stress components inside the body based on the estimated boundary values. This two-step method can be applied to a wide range of practical problems if both the inverse and direct problems are solved by FEM or BEM. In this study, the problem is formulated by BEM. It is shown that careful treatment of the inverse problem is essential for attaining an accurate result of the stress separation. The combination of the truncated singular value decomposition and Hansen's L-curve method is found to be effective for that purpose.

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