Study on some Effects on Shore Hardness Number : (7th Report) The Effect of Inclination of the Tester

Abstract

In this report, the effect of inclination of the tester on Shore hardness number was investigated. The experiment was carried out, with 3 Shore scleroscopes of D-type, on many specimens which were 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 effect of velocity of the operating handle and of pressing force to the specimen, were carefully maintained constant throuout this experiment. As a result, the effect of inclination of the tester on Shore hardness number was made clear. That is, on the whole, the behaviour of this effect is separated into 3 sections. Namely, 1st. is a horizontal line section where hardness number has no change, 2nd. is a inclined line section where hardness number dropes at constant rate, and 3rd. is a curved line section where hardness number takes a sudden drop. This effect is strongly influenced by structure of the tester, dimensions and finishing grade of its parts. And, the regulating apparatus, attached to the Shore sc1eroscope, to keep the tester vertical was proved almost sufficient.