ロックウェルかたさ測定値に及ぼす各種の影響に関する研究 : 第1報, 時間に関係ある影響因子, 特に押込速度に対する考察

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  • Study on Various Effects on the Rockwell Hardness : 1st Report, Some Considerations on the Effects Related to Time, especially on the Indenting Velocity
  • ロックウェル カタサ ソクテイチ ニ オヨボス カクシュ ノ エイキョウ ニ カンスル ケンキュウ 1

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抄録

In the indentation hardness, the measured hardness number is affected by some effects related to time such as the rate of denting of the indentor, the time of load application and the time from the beginning of unloading to the reading of the hardness number. The effects are considered remarkable in such testing as the Vickers and the Rockwell hardness tests which use sharp indentors. Then it cannot be expected to measure hardness numbers correctly, unless the testing is done under unified condition of these factors. The author has carried out a series of studies on various factors that affect the Rockwell hardness. In this report, as the first step of the research, the effects related to time in the testing were considered to establish the basis of testing method. As a result, dividing, construction and treatement of these factors have been made clear, and then a weak point in the hitherto treatement of the rate of denting has been pointed out. Then, need of reexamination of the provision in the standard of testing method provided for in each country has been presented. And a proposal of a method of unifying the rate of dentiong of the indentor has been also added here.

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