Use of holographic interferometry for studying elastic and plastic deformation

Abstract

1. By using the principle of inverting the rolling (or other technological) process by suitably constructing the devices incorporated in the steady-state holographic installation containing the continuous-action laser, very accurate quantitative data may be obtained regarding the spatial displacements of the free surface in both the elastic and plastic regions of the metal, being processed. 2. Allowing for the high sensitivity of the method (the range of measured displacements is 0.5–10 μ), the greatest advantages of the method may be expected to appear when studying small elastoplastic deformations or large deformations at individual points in the deformation process. 3. The method here described may be used in the rolling industry for studying the deformations of the lateral surface of blooms and slabs, the working, surfaces near the contact zone, and also the end surfaces of the work pleces, as well as studying the conditions of capture (nip) in both longitudinal and transverse rolling. 4. The foregoing method is rather laborious at the stage of restoring the interference patterns, deciphering the orders of the bands, and preparing the data for introduction into the computer. The whole process of obtaining the results may be mechanized and automated by using electronic recording apparatus.