鋼材の動的履歴特性に関する研究(第2報)

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This report presents the effect of sustained loading of the load above the static proportional limit in bending on the strength properties of steel plate in static reloading after removal of sustained loading. The dimension of cross-section of specimens was 50 mm (width) × 9 mm (thickness). As shown in Fig. 1, the specimens both for the control test and for the sustained loading test were supported as the cantilever and loaded at the free end. The control tests were made for preestimation of static yield load of the sustained loading test specimens adjacent to the control test specimens. The levels of sustained load in the sustained loading tests were 50 %, 60 %, 70 %, 80 %, 90 % and 100 % of static yield load, and two specimens were tested at each level. After 5 hours' sustained loading, the sustained loading test specimens were unloaded and then reloaded up to complete yield. The test results indicate that: (1) Comparison of the yield loads and moduli of elasticity of the specimens subjected to sustained load less than load at proportional limit (about 2/3 of static yield load) with those of virgin test specimens suggests that sustained loading has no effect on the yield load and modulus of elasticity at static reloading. (2) Both yield load and modulus of elasticity of specimens subjected to sustained load more than the load at proportional limit are higher than those of virgin specimens, and their increasing ratios are made higher as the sustained load increase. (3) In the sustained loading of constant load less than about 90 % of static yield load, creep deflection was not found or negligible, while in the case of constant load of 100 % of static yield load, creep deflection developed at a decreasing rate as time elapsed and almost diminished after 5 hours. The magnitude of plastic deflection which appeared during static loading and subsequent sustained loading was 50 % to 65 % of elastic deflection corresponding to static yield load.
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鋼材の動的履歴特性に関する研究(第2報)

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