On the Breaking Behaviours of the Perforated Notched Test Pieces in Charpy Impact Bending Test

DOI Web Site Web Site
  • Tanaka Minoru
    Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology
  • Nunomura Shigetomo
    Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology

Bibliographic Information

Other Title
  • 有孔切欠試片による衝撃曲げ試験
  • ユウコウ キリカケシヘン ニ ヨル ショウゲキ マゲ シケン

Search this article

Abstract

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.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top