高静水圧下の多結晶金属材料のねじりクリープ変形

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It has been confirmed by the present authors, as the result of the experimental studies they performed of the creep of pure aluminum and pure iron in the normal temperature range below 0,5T_m, 1T_m being the absolute melting temperature, that the creep rate of polycrystalline metals tends to decrease with the increase in hydrostatic pressure regardless of such a normal temperature range in which its diffusion mechanism is not be expected theoretically. It has also been confirmed that the effect of hydrostatic pressure on the flow stress of metals can be described satisfactorily by assuming the formulation of yield condition including the first invariant of stress J_1=σ_<kk>,(a) J'_2=k(k^2+CkJ_1+DJ^2_1)^<1/2>, and further that the qualitative explanation of creep rate decreasing with hydrostatic pressure of metals subjected to constant load is given uniformly by this yield condition from a side view of continuum mechanics. Secondly, however, in order to understand better the relationship of hydrostatic pressure to the deformation mechanism in plasticity and creep of metals it is necessary to evaluate quantitatively the difference in the intensity of the influence of hydrostatic pressure between these deformations. In the present study, therefore, it has been aimed at to evaluate numerically the change in the structure of metallic materials, i. e. the effects of hydrostatic pressure on the magnitude both of their plastic and of their creep deformation, and with these ends in view, various hydrostatic test, creep tests and simple torsion tests, of polycrystalline materials, e. g. pure aluminum, pure iron and pure zinc, have been carried put under several levels of hydrostatic pressure at room temperature. It is to be noticed that the torsion test is found effective in the investigation because its stress condition does not cause the change in the form of the test specimens, nor does it enter into the hydrostatic stress component.
社団法人日本材料学会の論文
1972-08-15

高静水圧下の多結晶金属材料のねじりクリープ変形

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