Strength Evaluation of Alumina Spray Coating (4th Report, Consideration of Spray Structure Strength for Mechanical Stress):(4<SUP>th</SUP> Report, Consideration of Spray Structure Strength for Mechanical Stress)

In this study, in order to calculate the dangerous volume under various stress distributions, the dangerous volume quantification method is proposed. Also in order to predict the stress distribution of the spray coating, an easy calculation method of the residual stress distribution based on the first report was proposed. The calculated dangerous volume in the alumina spray coating on titanium layer is different from an alumina spray coating single layer. The difference is based on the stress distribution in the alumina spray coating. The fracture strengths predicted by the proposed method and the third report are comparable to the experimental results obtained by 4-point bending tests. Therefore, the dangerous volume calculation for the thermal stress distribution that is different from the mechanical stress distribution also becomes possible.