低炭素鋼なまし材の塑性ひずみ繰返し応力-ひずみ曲線の解析

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The stress-strain behavior of annealed low carbon steel under cyclic straining was investigated, and the results obtained are as follows. (1) Under cyclic straining of constant total strain ranges of 2, 3 and 4%, the stress range increased with the increase in cyclic number. On the other hand, it decreased when the mean strain of 10% was applied. However, the stress range had a tendency to saturate with increase of cycles in both cases. (2) The stress σ'-plastic strain ε_p' relation in half cycle with the reference point at the tip of hysteresis loop was found to be composed of two linear portions on log-log plotting. The relation was described in the form of [numerical formula] where α_1 and α_2 are the strain hardening exponents according to the relation of plastic strain in value whether large or small respectively. ε_<po>' is the plastic strain dividing the plastic strain in the semi-cycle into two portions. (3) Strain range and the number of cycles seem to have little effect on the values of α_1, α_2 and ε_<po>'. α_1 and α_2 were about 0.18 and 0.08, respectively, and the former was about twice as large as the latter. ε_<po>' was in 0.6-0.9%. The mean strain produced larger value of α_2 in the semi-cycle of straining reverse to the mean strain in its direction. (4) The two different strain harderring exponents found in the semi-cycle may indicate that the elasto-plastic deformation occurs before plastic deformation during the semi-cycle. (5) In the saturated hysteresis-loop shape of stress-strain at various strain range, the stress range and plastic strain range was related as follows ; Δσ=K_OΔε_p^<α0> with α_0 of 0.19.
社団法人日本材料学会の論文
1972-02-15

低炭素鋼なまし材の塑性ひずみ繰返し応力-ひずみ曲線の解析

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