Effects of striker edge radius on load-deflection curve and absorbed energy in instrumented charpy impact test

Shigeki Morita, Toshiro Kobayashi, Mitsuo Niinomi, Hiroyuki Toda, Toshikazu Akahori

Research output: Contribution to journalReview articlepeer-review

Abstract

The striker edge radii of instrumented Charpy impact testing machine standardized in ISO and ASTM are different. Both edge radii are standardized in JIS. However, the effects of striker edge radii on load-deflection curve and absorbed energy are still unclear. In the present study, the effects of striker edge radii, which are standardized in ISO and ASTM, that is, striker edge radii of 2 mm and 8mm, on load-deflection curve and absorbed energy in instrumented Charpy impact tests were investigated. There is no difference in values of absorbed energy per unit ligament area between the two different striker edge radii when the values are less than 0.75 J/mm2. However, striker edge radius according to ASTM, that is, a striker edge radius of 8 mm, is not appropriate for Charpy impact test method because the four, instead of three, point bending condition occurs during fracture process of specimen with high absorbed energy. The effect of brinell deformation on absorbed energy measured in both striker edge radii is very small.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume91
Issue number5
DOIs
Publication statusPublished - 2005 May

Keywords

  • Absorbed energy
  • Ductile-brittle transition
  • Instrumented charpy impact test
  • Striker edge radius

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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