STRESS CONCENTRATIONS IN A RECTANGULAR PLATE WITH CIRCULAR PERFORATIONS ALONG ITS TWO BONDED EDGES AND SUBJECTED TO RESTRAINED SHRINKAGE

Two-dimensional photoelasticity is used for minimising stress concentration associated with a fillet present at the end of a solid propellant rocket grain subjected to restrained shrinkage. For this purpose, successive holes were added along the bonded interface of case and propellant, but no decrease was obtained. The photoelastic method used illustrates two uncommon techniques of interest to experimental stress analysts: (1) restrained shrinkage loading and (2) a parametric stress-analysis solution obtained with a single model.