The Influence of the Inclusions on the Stress Concentration in the Plate with Notches under Tension

The stresses of U-type notched bars with certain inclusions of different materials under tension were investigated photoelastically. The matrix of the bar 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 investigated and several interesting results were obtained conclusively.