Theoretical Study on the Effect of Mechanical Properties on the Holographic Interferogram

Optical Holography (OH) and Speckle Interferometry (SI) are the emerging optical techniques that can be used for the measurements of microscopic parameters such as displacement components, surface strain, surface roughness, contour, strain, slope, etc. These methods have evolved into an accepted branch of experimental stress analysis. In this paper, the computer aided interferometry for Non-Destructive Evaluation (NDE) is presented. A mathematical model is formulated for specimens of rectangular geometry and fringe patterns are generated using this model. Software program has been developed to simulate fringe patterns of the test specimen. A methodology is developed for optimizing the value of stress required to generate the visible fringe pattern in different materials. The effect of variation of fringe pattern with respect to mechanical properties such as Poisson’s ratio and Young’s modulus has been studied.