抄録
A convenient method for quantitative evaluation of time dependent stress and strain around a contact region under moving load is discussed. In this study, a rectangular viscoelastic strip made of an epoxy resin is loaded by a cylindrical hard roller moving along the upper edge. In order to realize a typical non-proportional loading condition, the cylindrical roller is moved at a constant velocity from rest under two different temperature conditions covering remarkable viscoelastic response of the material. The well-known Diagonal Summation Theorem in photoelastic technique is extensively applied to a number of sets of plane polariscope images under viscoelastic conditions of the material. Time variation of fringe order and principal birefringence direction at two different fixed points located near contact are successfully measured and not only the time dependent principal stress and strain differences but also their principal directions evaluated.
