ショアかたさ測定値に及ぼす各種の影響に関する研究(第5報) : 端面効果について

概要

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In this report, the end effect on Shore herdness number was investigated. The experiment was carried out, with a Shore scleroscope of D-type, on many specimens which different in hardness or in material. It is needless to mention that the general requests for testing were satisfied in this experiment. Especially operating conditions of the tester immune from the effects of velocity of the operating handle and of pressing force to the specimen, were carefully maintained throughout this experiment. As a result, the end effect on Shore hardness numder was made clear. That is, under sufficient pressing force to the specimen, so-called end effect gives ne influence upon hardness number in such long distance from the end of specimen as hitherto mentioned. The end effect appeared within 1 mm from the end of the specimen according to hardness of the specimen, and the effecting range became narrower as hardness of the specimen. And it was represented that a linear relation was existed between hardness of the specimen and the critical distance for the end effect. From a practical point of view, it is desirable te test at a point as far as possible from the end of the specimen, more than 1 mm.
一般社団法人日本機械学会の論文
1957-03-25