各種構造用鋼材のひずみ時効後の高速引張特性 : 応力集中部を有する400, 490および780MPa級鋼の高速引張試験

概要

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It is well known that strain rate affect tensile behavior, such as tensile strength and fracture elongation, of metal. In this paper, effect of strain rate on tensile property (tensile strength and elongation after fracture) of strain aged SM400, SM490 and HT780 are investigated. Tensile tests were performed under strain rate of 0.085, 85 and 1000%/s. Main results are summarized as follows. 1) Regardless of aging condition, tensile strength became large by the effect of high strain rate. Increase rate of tensile stress became large with rising in strain rate. 2) Elongation after fracture also became large by the effect of high strain rate. Increase rate of elongation became large with rising in strain rate. However the increase rates of elongation of aged steels were small compare to those of virgin steels. 3) The increase rate of tensile stress by effect of the high strain rate became small with increasing tensile strength under static test. Regardless of the aging condition, the increase rate of tensile stress by the effect of high strain rate can be assumed only by the tensile strength under static test.
一般社団法人日本建築学会の論文
2010-03-27