押込かたさについて(第4報) : かたさの標準に対する新提案

概要

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The author presents the following expression as a new proposition for indentation hardness ; i.e. [numerical formula] in which H_N represents the new hardness number, σ the compressive stress, ε the total and ε_p the permanent strain. He investigated theoretically the relation between this new hardness number and the wide-spread indentation hardnesses which would be obtained by using any one of the indenting tools suchas a ball, a cone, or a prism, etc., and deduced an expression which gives a relation between hardnesses. As an example, he carried out both the compression and hardness tests for copper, mild steel and special steel specimens and compared those results with the above formula. Let H_B be a hardness number obtained by ball compression and H_p that due to a prismatic indenting tool, then the formula connecting these hardnesses will be expressed as [numerical formula] where [numerical formula] and λ, λ' are constant depending on one or both of characteristic of materials and angle of prismatic indenting tool.
一般社団法人日本機械学会の論文
1952-03-15