Estimation Method of Interfacial Stress Distribution by Inverse Analysis of Deformed Shape Data

A novel estimation method of interfacial stress distribution at bonded parts has been developed by inverse analysis techniques. From the deformed shape of the target adherend measured by laser sensors, the stress distribution between the adherend and the adhesive is computed by the finite element analysis and the Tikhonov regularization. This estimation method requires only the constituent equation and the material constants of the target adherend which is modeled easier than the whole structure including the adhesive. A peel test has been conducted to investigate the behavior of the proposed method. The test results show that the regularization parameter takes optimal value when the sum of the estimated stress distribution is at its maximum value, and the magnitude of the estimated stress agrees with that in the results of the uniaxial tensile test.