A new experimental method for the determination of adhesion strength between two different materials is proposed. A curved interface and special arrangement of materials is used for the tensile test of bimaterial specimens to avoid singular stress fields around corners and edges. Assuming that normal stresses are responsible for debonding at the interface, the adhesion strength can be determined from critical loads at debonding initiation. The stress concentrations at the interface as a function of applied load are derived by the finite-element method. The calculations are made for material constants that are typical for a polymer-polymer bimaterial; however, the method is applicable for all composites of two materials which show elastic behaviour prior to first failure. The main advantage of the test consists in the fact that the strength is determined under conditions of a uniform tensile stress field normal to the interface in the region where debonding starts.