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In this paper, the inverses of both the elastic constants and the thermal expansion coefficients of anisotropic materials are used to decouple thermo-mechanical deformation using the virtual fields method (VFM). First, a method for inversing and decoupling the thermo-mechanical deformation field under three-point bending loading is proposed based on the VFM. Second, thermo-mechanical coupled deformation of the three-point bending specimen is simulated by means of the finite-element method, and the inverse of the thermo-mechanical elastic constants are used, which agree well with the reference value. Finally, the influences of the noise level on the accuracy of the thermo-mechanical constants from the VFM are discussed. The results will provide a new method for characterizing thermo-mechanical elastic constants and decoupling the thermo-mechanical deformation of anisotropic materials under high-temperature environments.

Inversion and decoupling of thermo-mechanical deformation in anisotropic materials using the virtual fields method