平面ひずみ状態での炭素鋼の変形強度とひずみ速度依存性

概要

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The dependence of strain rate on deformation strength was investigated on various pre-strained specimens of carbon steels under plane strain. The strain rate was from 4×10^<-3> to 2×10^4 sec^<-1>. In the range of high strain rate. a newly developed Stress-Strain Curve Direct View Device was used for the measurement of deformation strength. Furthermore, Digital memory Scopes were utilized to obtain highly accurate experimental data. The results obtained are summarized as follows : (1) The deformation strength σ in plane strain is related to strain ε, strain fate ε^^・ and temperature T by σ(ε, ε^^・, T)= k_0ε^<n1>ε^^・<n2>exp(α/T) where n_1 is the strain hardening exponent, n_2 the strain rate exponent, α the temperature dependence index and k_0 the strength constant. (2) The carbon equivalent value of yield stress C_y and the strain hardening exponent n_1 and the temperature dependence index α are related each other. If C_y is known, the deformation strength in plane strain can be estimated from the average value of n_2 of all kinds of steel by using this correlation.
1979-10-15