引張および逆荷重下の切欠き丸棒の挙動

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Recently there has been a tendency that the range for using materials extends to not only elastic region but also plastic region by making them lighter and larger. It is often observed that especially under actual load, the stress over yield point loads on the notched parts, while the structure acts elastically. So it has become necessary more and more to clarify the elasto-plastic behavior of notched material from a view point of design. In this paper, elasto-plastic behavior of SM 50 steel notched bars of three types under tensile and compressive load was analyzed by means of the finite clement method and the behavior of stress-strain distribution and plastic zone was clarified. From the result of the calculation, the conclusion is summarized as follows: 1. The difference of fracture appearances of each notched specimen was explained by the behavior of stress distribution and plastic zone under static load. 2. It was clarified that the required load is constant to develop the plastic region to 0.2mm in depth from the notch surface at the net section of notched specimen regardless of a size of notch factor. 3. The estimation of strength by using Neuber's formula K_t=(K_σK_〓)^<1/2> gives the safe value under general yield load. 4. Stress distribution and plastic zone of tension side and compression side under the first cycle of completely reversed load-controlled test are almost the same. 5. The residual stress decreases with the repetition of cyclic load.
社団法人日本船舶海洋工学会の論文
1972-09-30

引張および逆荷重下の切欠き丸棒の挙動

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