プラスチックスのロックウエル硬さにおける押込み加圧時間と除圧後の時間の影響について

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The authors have inquired experimentally into the effects of the times of impressing the specimen and after unloading upon the Rockwell hardness numbers for plastics and steel. The experiments have been carried out under the constant impressive load, 150 kg, using the constant indentor, 1/4 inch steel ball. The materials of specimens tested are a soft steel and the five kinds of plastics, such as phenolic, urea, polyester, polyester, polystyrene and uylon. As the results, two empirical formulas have been derived as follows : H_R=H_1-ΔH_0・(log t)^m (1) and H_R=(H_1-k・log t)+(n_1+l・log t){log(log t')} (2) where H_R is the total depth of indented hole under impressive loading in the scale of Rockwell hardness numbers, H_1 hardness numbers at impressive loading instant, ΔH_0 hardness numbers' changes form H_1 to 10 sec impressive loading's, H_R Rockwell hardness numbers, t duration of impressive loading , t' time after unloading, and H_1, k, l, m and n_1 are the constants proper to the materials. Accordingly, the Rockwell hardness numbers H_<R1> for the standard duration of impressive loading t_1 and time after unloading t'_1 may be obtained by the following formula H_<R1>=H_R +k・log t/<t1> + n_1・log(<logt'_1> / <logt'>) + l・{logt_1・log(logt'_1)-logt・log(logt')} (3) where H_R is the Rockwell hardness numbers of the material for any duration of impressive loading t and time after unloading t'.
社団法人日本材料学会の論文
1960-06-15

プラスチックスのロックウエル硬さにおける押込み加圧時間と除圧後の時間の影響について

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