Experimental stress analysis by photo-rheologic method

In the photo-rheologic method used in this paper, the time-dependent creep strain rate and the instantaneous elastic-plastic strain rate are considered. Unlike ordinary photoplasticity, the strain history and the time dependence are accounted for in this stress analysis by characteristic values independent of strain rate. This method is also suitable for analyzing finite deformations. Using this method, the time-dependent deformations and stresses in a body can be analyzed with the same accuracy as photoelasticity from the instant of loading to the static-equilibrium state during plastic flow or creep. Fundamental concepts and procedures are described. Two examples are used to demonstrate possible applications of this method.