近接2円孔を有する薄板材のき裂発生過程と引張り破断延性の検討

概要

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The linking and cracking processes of two neighboring holes in a thin sheet metal were investigated in detail to get quantitative information about the deformation behavior of voids in a ductile fracture. The holes deform into elliptical holes and crack with come intruding and/or protruding under tension, depending on the experimental variables of the inter-hole distance ξ_o/2r_o (r_o: radius), the two-hole arrangement angle φ_0 and the plastic strain. The complicated shape of the deformed hole is qualitatively measured and analyzed. The deformation of two holes having various arrangements of ξ_o/2r_o and φ_0 has also been analyzed by an elastic-plastic FEM, and the results are in qualitative agreement with the experimental data. Fracture ductility for the linking or cracking of two holes is approximately expressed by applying McClintock's fracture model for each volume which contains a hole at its center. The values of linking strain ε_Z, cal. and fracture strain ε_f, cal. by the equations are consistent with the experimental linking strain ε_Z, exp. and cracking strain ε_C, exp. where cracking strain is, of course, a few percentages smaller than the fracture strain in a ductile fracture.
一般社団法人日本機械学会の論文
1987-12-25