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The flexural fatigue resistance of plastics as determined by ASTM Test for Flexural Fatigue of Plastics by Constant-Amplitude-of-Force (D 671-71) employs a technique that permits the testing of only a single specimen at a time. By contrast, the test based on constant-amplitude-of-deflection of the specimen proposed in this paper accommodates up to 16 specimens simultaneously, thereby substantially reducing the time required for the test. Constant-amplitude-of-deflection of the specimen is effected by rotation of its builtin end. Experimental data are presented that show that both methods give substantially comparable results for nylon 6/6 and acetal homopolymer. A brief description of the apparatus required for the new test is also given.
Associate professorMember of ASTM, Mechanical Engineering Department, Ecole Polytechnique Montreal, Quebec,
Chef de travaux pratiques, Départment de Production, Ecole Nationale Supérieure des Arts et Métiers, Paris,
Stock #: JTE10918J