シャルピー式衝撃曲げ試験における亀裂発生と伝播に関する二，三の実験

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タイトル別名
  • On the Crack Initiation and Propagation in Charpy Impact Bending Test
  • シャルピーシキ ショウゲキ マゲ シケン ニ オケル キレツ ハッセイ ト デンパ ニ カンスル ニ , サン ノ ジッケン

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抄録

The breaking behaviours of a common mild steel in the standard Charpy test and the interrupted impact bending test (impact velocity 1m/sec) have been studied by observing load-time curves, strain distributions and fracture appearances. The results obtained in this study are summerized as follows:<BR>(1) The 15 ft-1b transition temperature (Tr15) is raised linearly with an increase in grain size of specimen. Although the total absorbed energy is lowered with an increase in grain size, the crack initiation load becomes higher in coarse grained specimen than in fine one. The critical crack size for initiation and propagation is observed of the order of the grain size. The breaking behaviours depend on the length and the numbers of cracks which are developed in the initial stage of blow.<BR>(2) The effects of the prestraining on the transition temperature and on the crack initiation load are also similarly observed as above-mentioned for the coarse grained specimens. In prestrained specimens, however, the breaking behaviours depend on the conditions of hardening due to the strain aging.<BR>(3) The cracks developed below the transition temperature appear about 5.5 mm or more in length by the interrupted impact tests which are applied the definite impact arrested length at each testing temperature, such as 1.0 mm, 0.6 mm and 0.2 mm at −60°, −80° and −196°C respectively.<BR>The cracks do not appear below the transition temperature less than 5.5 mm in length in these interrupted tests.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (11), 535-541, 1963

    公益社団法人 日本金属学会

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