A method for predicting stress and strain of a turbine blade ceramic shell baking-casting high temperature process considering historical residual stress

Abstract

This invention discloses a method for predicting stress and strain during the high-temperature process of calcination and casting of ceramic shells for turbine blades, considering historical residual stress. It belongs to the fields of precision casting and computer-aided design technology. The method includes: establishing a shell mesh in ProCAST and generating an ABAQUS homologous mesh via Python remapping; performing thermo-mechanical coupling analysis of the calcination stage in ABAQUS to obtain residual stress; extracting the instantaneous temperature field through casting solidification simulation in ProCAST and transferring it to ABAQUS based on homologous mesh node mapping; using the calcination results as initial conditions, performing thermo-mechanical coupling analysis of the casting stage step-by-step to obtain the cumulative stress and strain field throughout the entire calcination-casting process. This invention significantly improves the prediction accuracy of multi-stage thermal stress accumulation in thin-walled ceramic shells, can be used to assess shell fracture risk, and provides a basis for process optimization.

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