純曲げを受ける片側切欠材のひずみ集中係数

概要

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The strain-concentration factor was calculated using finite element method for plane-strain rectangular bars with a single-edge U-notch under pure bending. The strain-concentration factor employed is newly defined under the triaxial stress state at the net section. This new strain-concentration factor increases from its elastic value to the maximum as plastic deformation develops from the notch root. The maximum strain-concentration factor of a shallow notch is considerably greater than that of a deep notch, although the elastic strain-concentration factor is reversed. Plastic deformation around the notch root has a stronger effect on the strain-concentration factor of shallow notches. This is because plastic deformation develops mainly in the vicinity of the notch root for shallow notches. The strainconcentration factor employed here corresponds well to the distribution of the longitudinal strain at the net section. The variation of the strain-concentration factor with M/M_Y, the ratio of bending moment to that at yielding at the notch root, is dependent on the stress-strain curve for shallow notches, especially beyond the deformation level at which the maximum strain-concentration factor occurs. The integral of the longitudinal strain at the net section is negative in elastic deformation for single-edge notches. It varies from negative to positive value with plastic deformation around the notch root.
社団法人日本材料学会の論文
2005-07-15