A modification of the moireA fringes technique for the analysis of moments and deflexions in a laterally loaded plate

This paper describes an adaptation of the moire fringes method for the analysis of uniformly laterally loaded plates with various edge conditions. In this technique the deflected specimen is composed of two parallel transparent sheets forming walls of a sealed water–filled cell. Under pressure, the cell acts as a lens and interference fringes are produced by photographing a ruled screen through it. A method of analysis using thin lens theory is presented and experimental results are compared with figures obtained by a finite differences solution. Good agreement is found between the result of the two alternative analyses.