Disc shear strength test

BS 2782. Methods 340A and B [52]. cover the determination of shear strength for molding material and for sheet material respectively. For Method 340A (Fig. 7). the test pieces are molded discs 25.3 0.1 mm in diameter and 1.6 0.1 mm thick. w ile for... 

LSS Lap Shear Strength. Normally determined by an overlap test configuration. PhenoHcs d = disc shear . 

The stress distribution is not even, with this test piece, and the action is not pure tension but involves peel and shear forces. The test was investigated by Painter [11] who showed that the stress is concentrated at the tips of the cones. He found that failure occurred at the interface rather than in the rubber, and the measured strengths were lower than with a plain disc test piece of similar diameter, more in line with the results of peel tests. It is probable that the result is sensitive to geometry, particularly the cone... 

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