抄録
The strength evaluation of pin joints for crane structure, which are subjected to tensile loads, by experiment and by stress analysis using FEM is presented. The yield as the joint occurs at about 2.3 times the tensile load, where the maximum tensile stress of the pin joint reaches the yield point of the material. The yield strength can be obtained, for practical usage, either as the tensile stress of the net area transversing the load axis or as the shear stress of the tear-out section area in the direction of the load. The former stress depends on the ratio R/γ (R : the outer radius of the joint, γ : the pin radius), the latter stress is independent of the ratio. FEM analysis shows that the general yield of the joint occurs when the yield area expanding from the inner edge of the pin hole combines with the other yield area expanding from the top of the joint. The fracture mode of the joint depends on the ratio R/γ.
