@article{oai:niigata-u.repo.nii.ac.jp:00003696, author = {石橋, 達弥 and 下田, 茂 and 古川, 徹 and 新田, 勇 and 蒲沢, 英喜}, issue = {501}, journal = {日本機械学会論文集. A編, 日本機械学会論文集. A編}, month = {May}, note = {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_ characteristics are obtained with the indenting experiments by a spherical indenter, and flow stress Y-total strain ε(=ε_) 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_ / 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.}, pages = {1158--1164}, title = {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}, volume = {54}, year = {1988} }