Abstract
The authors had reported the transition phenomenon of the increasing creep rate with the augment of prestrain, in the torsional creep test of previously twisted mild steel. In this report, we investigated the same phenomenon in the torsional creep test to HCM steel previously tensioned.From. Figs. 6-8, We know that, on increasing the prestrain of the steel, creep rate increases abruptly, after the prestrain exceeds the ultimate-point, to about two times of creep rate before that point and appears to remain constant approximately before and after this transition zone.Fig. 9 shows the relation between strain rate γ (as to γ1 and γ2, see Fig. 6-8) and the value of stress τ ; on the while, Fig. 10 shows the experimental results concerning the following relation, { γ=KPnP=γ⋅e- /RT, where K and n are the constants, T is the absolute temperature, Q is the activation energy and R is the gas constant. From these relations, we know that the ratio γ2/γ1 is constant (about1/2) independently of the value of shear stress.
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