軟鋼棒の圧縮および曲げによる寸法効果  [in Japanese] Size Effect of Mild Steel under Compression and Bending  [in Japanese]

The ”Size Effect” which means the variation of mechanical properties caused by the dimension of the test piece shall be recognized not only in tension but in compression or bending. The effect in tension is based on the surface layer or the defect of structure inside of the test piece, but in compression test it will arise from the condidion of contact between the test piece's end and the testing machine bed. When pure bending moments are applied to rectangular or circular beams, the size effect shall be observed in the same way in tension. From the result of these experiments, stated in this paper, the yielding point slightly decreases in compression and slightly increases in bending with its sectional area.

The "Size Effect" which means the variation of mechanical properties caused by the dimension of the test piece shall be recognized not only in tension but in compression or bending. The effect in tension is based on the surface layer or the defect of structure inside of the test piece, but in compression test it will arise from the condidion of contact between the test piece's end and the testing machine bed. When pure bending moments are applied to rectangular or circular beams, the size effect shall be observed in the same way in tension. From the result of these experiments, stated in this paper, the yielding point slightly decreases in compression and slightly increases in bending with its sectional area.