低YR高張力鋼の機械的性質に及ぼす歪速度の影響

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High loading-rate tensile test was conducted to investigate the strain-rate effects in a newly developed 60 kgf/mm^2-tensile-strength steel with low yield ratio. As a reference, the conventional mild steel (SS41), high-strength low-alloy steel (SM50), and quenched and tempered steel (SM58) were also tested in the same procedure. The specimens consisted of four different shapes to examine the ductility in steels under stress gradient. The strain rate was varied between 10^<-3> and 1 sec^<-1>. With respect to the new high-strength steel, no distinguishable increase of yield ratio and no significant decrease of ductility were observed with elevated strain rates. With respect to SS41, SM50, and SM58, basically the same tendency on strain-rate effects as reported in previous experimental works performed by many researchers was observed in this test. It was demonstrated that the yield ratio obtained from an ordinary tension coupon is a very conservative index for the ductility of specimens with varied cross section, because of notch strengthening, and thus effective yield ratio including the notch strengthening effect was proposed. The ordinary yield ratio tends to increase with strain rate especially for mild steel. However, the effective yield ratio tends to keep constant irrespective of strain rate, resulting in no remarkable reduction in ductility of specimens with varied cross section even for mild steel as well as for high-strength steels.
一般社団法人日本建築学会の論文
1990-03-15

低YR高張力鋼の機械的性質に及ぼす歪速度の影響

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