多孔質遮熱被膜の弾塑性変形特性

抄録

We have established the torsion pin test method with tension to evaluate shearing delamination strength of thermal sprayed coating under tension-torsion combined stresses, recently. Apparent delamination strength depends on the diameter of the pin, so the stress distributions around the interface edge between the top-coat and the bonding coat have to be analyzed by using the finite element analysis based on the experimental results to see the real delamination strength. Before analyzing, the deformation propertiesofthe thermal sprayed coating have to be known. In this report, macroscopic nonlinear elastic deformation properties of the four kinds of porous Thermal Barrier Coating (TBC) is investigated experimentallyand analytically. First, the indentation tests were performed to obtain the load-depth curves, and secondarilyYoung's modulus were explored and then the coefficients A and n in the expression σ=Aε_nlⁿ which means the stress-nonlinear elastic strain relation were also explored as the results of the inverse analysis by using FEM analysis with Karman filter. And finally the coefficient B in the expressionσ=A(1+Bε_nl)ε_nlⁿ was explored in the same way as the final deformation properties for the four kinds of porous thermal barrier coatings.