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To get a clear knowledge of the condition for yielding of mild steel subjected to the combined action of tension and bending, the authors treated this problem theoretically and experimentally. They carried out the eccentric tension tests of mild steel specimens and compared their results with the theoretical values which were calculated by them. They recognized that the value of yield stress in the conbined case of tension and bending lies between σ_v and 3/2σ_v according to the eccentricity of tensile load where σ_v stands for the yield stress in the simple tension and 3/2σ_v is that of the pure bending which corresponds to the case of infinite eccentricity. The linear relation σ_2=3/2σ_v-1/2σ_t where σ_3 stands for the yield stress and σ_t the mean tensile stress on the cross section, shows to be in good conformity with the condition of yielding in these cases. In the case of the large eccentricity, the first yielding occurs on the surface of tension side of the bar and extends inwards with the load increasing or the development of yielding and accordingly the neutral axis changes its position slightly. But, as soon as both sides of the test piece began to yield, the translation of the neutral axis ceases and the maximum stress in the cross section rises to the value 3/2σ_v. The bending moment keeps constant during the period of both sides yielding. On the contrary, when the eccentricity is relatively small, the compression side disappears from the cross section and though the bending moment takes the value corresponding to the above relation (1) at the begining of yielding, it decreases its value. with the development of yielding and there occurs both sides yielding near the end of yielding.
社団法人日本機械学会の論文
1952-03-15

偏心引張りにおいての軟鋼の降伏について

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