球圧子の押込硬さ試験方式を利用した高分子材料の変形抵抗 : ひずみ特性測定法

概要

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This study deals with the measuring method about flow stress-strain characteristics of plastics using the indenting hardness test by a spherical indenter. Firstly, hardness Pm(mean contact pressure)-total mean strain of an indentation ε_<ic> characteristics are obtained with the indenting experiments by a spherical indenter, and flow stress Y-total strain ε(=ε_<ic>) characteristics are measured using the uniaxial compression tests for plastic materials ; PMMA, ABS, PC and PE. Secondly, Hardness/Flow stress ratio C is formulated, C=9.8 Pm/Y:Y in MPa, as the function of the ratio (ε_<ic> / ε_r), ε_r is an elastic recovery strain (=Y/E_s, E_s : Young's modulus). Finally, it is shown that flow stress-strain characteristics from the elastic strain range to about the 10-15% strain range of plastics can be obtained using a one time indenting hardness test by a spherical indenter, by means of the calculation with the formulated equations in this paper and the former reports, and this method can be applied to the present hardness testing machines.
社団法人日本機械学会の論文
1988-05-25