Non-destructive simultaneous measurement of thickness and elastic modulus of plate with taper by laser ultrasonic method

Abstract

In the evaluation of objects moving at high speed or high-temperature objects, it is necessary to develop a technology that simultaneously and accurately measures the thickness and modulus of elasticity of materials in real time. In this study, we investigated the possibility of simultaneous measurement of thickness and modulus of elasticity using laser ultrasonic method and investigated the measurement accuracy. An aluminum alloy was used as the test target, tapered the surface of the test piece, and thickness measurement tests were conducted. Furthermore, we proposed a method for simultaneous measurement of thickness and coefficient of elasticity using longitudinal and shear waves following multiple propagation paths and clarified the influence of tapering on the surface of the test piece on the measurement accuracy of thickness and coefficient of elasticity.