モードIとモードIIの混合モード荷重下の薄板き製材の延性破壊挙動

概要

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In this paper, a testing method for the mixed-mode fracture of cracked sheet specimens was proposed to investigate the ductile fracture behavior with stable crack growth under the mode I-II mixed-mode loading condition. In contrast to the conventional method using a slant-cracked specimen, it is possible in the proposed method to keep the ligament width constant irrespective of the angle between the tensile loading direction and the crack plane, and thus, to separate the influence of the loading direction and that of the ligament width on the ductile fracture behavior. The validity of the proposed testing method was examined by rosett analyses, finite-element analyses, and the fracture toughness tests using the plate of PMMA. Mixed-mode fracture tests were carried out on center-cracked sheet specimens with various ligament widths of 2024-T3 and S50C(thickness=1.6 mm) using the proposed testing method. From the test results, it was found that the direction of ductile crack extension and the fracture appearance varied according to the loading direction. The Mises equivalent stress obtained at the maximum load using the net cross-sectional area was almost constant independent of the ligament width and the loading direction.
一般社団法人日本機械学会の論文
1990-12-25