有孔切欠試片による衝撃曲げ試験

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タイトル別名
  • On the Breaking Behaviours of the Perforated Notched Test Pieces in Charpy Impact Bending Test
  • ユウコウ キリカケシヘン ニ ヨル ショウゲキ マゲ シケン

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抄録

The object of this paper is to study the breaking behaviours of a structural steel for low temperature service in Charpy impact bending test using the perforated notched test pieces which were proposed by one of the authors.<BR>The results obtained in this paper are summarized as follows:<BR>(1) The perforated notched test piece is available for the differentiation between the crack initiation and propagation stages. The crack initiation energy can be estimated easily by using the both of the perforated notched test piece and the standard key hole test piece.<BR>By this method, the relationship between the breaking energy and the breaking length in brittle fracture can be also determined. This relationship indicates a distinct difference between the test steel and the high tensile structural steel already tested.<BR>(2) The impact tensile strength can be calculated from the maximum load of load-time curve which has been obtained at the breaking of perforated notched test piece in Charpy bending test. The calculated values of impact tensile strength are about 1.1∼1.4 times of the values of upper yield strength obtained by the high speed tension test under the stress rate 4×106 kg/mm2·sec which is equal to the stress rate of Charpy bending test.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (10), 486-490, 1963

    公益社団法人 日本金属学会

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