Method of manufacturing a product by estimating thermal stress using a model of the product made of different material

摘要

A method of manufacturing a heat resistant member includes the step of designing the shape of the heat resistant member, including the substeps of estimating thermal stress of the heat resistant member by heating a model formed by a high-thermal expansion material which has a similar shape to the desired shape of the heat resistant member while the model is restrained and also while it is free. The high-thermal expansion material is different from the material of the member being modeled and has a thermal expansion coefficient greater than that of the material of the member being modeled. Additionally, the step of designing includes the substeps of measuring the strain of the model at each of a plurality of predetermined positions while the model is heated by strain gauges adhered to predetermined positions on the model, and calculating the stress at each predetermined position from the difference in measured strain values between the restraint state and the free state. Finally, the manufacturing method includes casting the heat resistant member to the designed shape.