横穴をもつ軟鋼中空円形はりの降伏 : 第1報, 実験

抄録

The stress σ_A at the yield point of mild steel beam of a hollow circular cross section with a radial hole is investigated by experiments, and effects of the radial hole, the outer diameter of the beam and the ratio of inner to outer diameter of the beam upon the yield point are clarfied. Let 2a be the diameter of the radial hole, 2γ₁ and 2γ₀ be the inner and outer diameters of the beam, and γ₁ be γ₁/γ₀, and the experimential data are concluded as follows : (1) In the range of γ₁≤0.65, there is a size effect in σ_A, i.e., σ_A decreases as 2γ₀ increases when γ₁ and a/γ₀ are kept constant. (2) In the range of γ₁≥0.65, γ_A is affected by 2a, but is free from 2γ₀ when γ₁ is kept constant.