ダイヤモンドコーン押込かたさの力学的解析

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In general, the hardness of material is defined technically as the degree of resistance met by an indenter when it penetrates into the specimen. Understanding it mechanically, the penetration would come to an end when the load balances with the sum of stress component in the axial direction integrated upon the whole contacting area between the indenter and specimen. From this point of view, the author found the theoretical relation between the indenting load, conical angle, the radius of spherical apex of indenter and the depth of indentation. Stress distribution on the contact surface was solved by the slip-line theory. To check this relation, the depths of indentation for many kinds of specimen with different hardness, the indenter and load were measured by a special type of displacement gauge and compared with the calculated results. From that equation, both the theoretical conversion between H_R C, D, A, H_R 45N, 3ON, 15N and H_V and the equations of errors of H_R arised from the errors of load, conical angle and radius of spherical apex were induced. The calculated values by these equations were compared with the experimental results found by many workers. At last, the hardnesses of curved surfaces measured by the indentation method were studied from the same point of view. As a result, the Rockwell hardness can be explained as the function of yield stress of material similarly with the other types of indentation hardness.
一般社団法人日本機械学会の論文
1960-01-25

著者

黒木剛司郎
茨城大学工学部

ダイヤモンドコーン押込かたさの力学的解析

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