プラスチックの疲労中の弾性率変化の追跡法

概要

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In this report a new method of explaining the fatigue of plastics in terms of change of their properties is proposed. The fatigue testing machine used here is ASTM (D 671-63 T, Method B) type, constant amplitude of force, cantilever flexural fatigue, and is equipped with differential transformer displacement meter and the moment bar with strain gage. According to the dynamic rheological theory, │E│=σ_0/ε_0=KP_0/d_0 where │E│:absolute value of complex dynamic Young's modulus, σ_0・ε_0・P_0・d_0 : peak value of stress・strain・load・deflection respectively, K: size parameter of specimen, and K was derived as follows. In the case of rectangular specimen K=4L^3/bh^3 and ASTM type triangular specimen K≒3L^2/tanθh^3 where L・b・h・θ : distance between both grips・width・thickness・inclination angle of side line, of specimen respectively. When K,P_0 are given, the change of │E│has sometimes been disturbed by the rise and growth of crack in the specimen. It is concluded that this method is applicable to the study of the fatigue of polymeric materials.
社団法人日本材料学会の論文
1968-09-15