銅および低炭素鋼のねじりにおける切欠きクリープ破壊

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タイトル別名
  • Notch Creep Rupture Strength of Copper and Low Carbon Steel under Torsion
  • ドウ オヨビ テイタンソ コウ ノ ネジリ ニ オケル キリカキ クリープ ハカイ

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説明

Notch creep rupture strength under torsion was studied for OFHC copper and S 10 C low carbon steel at 200°C and 450°C, respectively. The torsional loading was selected in this study mainly because of several relative merits over the tensile loading from mechanics point of view, such as no existence of the hydrostatic stress component and the negligibility of change in specimen geometry during finite deformation. The results obtained are summarized as follows:<br>(1) Both of the materials investigated, which had previously been found to show “notch-strengthening” under tension, behaved “notch-weakening” under torsion, as was expected from a fracture-mechanics analysis by the authors of notch creep rupture strength under torsion.<br>(2) The mode of crack propagation for the OFHC copper was transgranular in the short life range and intergranular in the medium and long life ranges. For the S 10 C low carbon steel, cracks grew in the transgranular or mixed trans- and intergranular mode. These were essentially the same as those observed under tension.<br>(3) Comparing the results observed under torsion with those under tension, one can conclude that the mechanical plastic constraint of strains induced by the multiaxial tension in the vicinity of the notch root and the contraction of cross-sectional area due to large deformation, particularly in unnotched specimens, are two main causes responsible for “notch-strengthening”; in the lack of these two causes “notch-weakening” prevails.

収録刊行物

  • 材料

    材料 23 (246), 196-201, 1974

    公益社団法人 日本材料学会

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