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This paper presents a review of the investigations involving the effect of speed of testing on the tension test of elastomers and hard rubber. It is concluded that, for elastomers in the range of 20 in. per min. or 0.03 per cent per millisecond, the elongation rate usually has little effect. At speeds above 4 per cent per millisecond, however, the test results are altered. For elastomer stocks which crystallize, tensile strength is independent of speed until rates too fast for crystallization to occur are exceeded after which point there is a drop in tensile strength. Above elongation rates of about 10 per cent per millisecond, tensile strength increases as slipping contacts have less chance to relax. For hard rubber, increasing speed seems to increase tensile strength even at low speeds.
Scott, D. C.
Scott Testers, Inc., Providence, R. I.
Villars, D. S.
Research Scientist, U. S. Naval Ordnance Test Station, China Lake, Calif.