Optical approaches of a photoelastic medium for theoretical and experimental study of the stresses in a three-dimensional specimen

摘要

The aim of this study is to develop a procedure consisting in comparing real photoelastic fringes with the fringe pattern calculated with a theoretical or numerical stress field. This process can be used to validate for example the boundary conditions or mesh of a three-dimensional mechanical problem. We show three optical approaches of a three-dimensional specimen giving the classical photoelastic fringes (isochromatic and isoclinic patterns) from a theoretical stress distribution. So we used a new experimental technique for the study of stress fields in a three-dimensional medium. We show a comparison between these three formulations and experimental results obtained by our non-destructive method of optical slicing.