Abstract
The stresses in U-type notched bars with certain inclusions of different materials under tension were investigated photoelastically. The matrix of the model was made of epoxy resin and the inclusions of duralumin, epoxy resin, epoxy rubber, (epoxy polysulfide copolymer) were bonded together by adhesive medium and U-type notches were machined on both sides. The models were tested under tension with polariscope, and then the maximum stresses on the boundary of notches were observed and several interesting results were obtained conclusively.
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