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Materials pp 217-224 | Cite as

Charpy Specimen Tests at 4 K

  • R. L. Tobler
  • A. Bussiba
  • J. F. Guzzo
  • I. S. Hwang
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 38)

Abstract

This paper describes nonstandard methods of testing Charpy specimens at 4 K. We show that the initial temperature can be achieved using a helium flow method with U-type as well as C-type machines. Unfortunately, heating during impact loading weakens the correlation with quasistatic fracture toughness parameters. Alternative test procedures using fatigue precracked specimens were not fully satisfactory, either: (1) Precracking reduces the impact energy by 35–54%, but the specimen heating is still significant; (2) slow bending curtails the heating most effectively, but then the desired simplicity of a screening test is lost.

Keywords

Fracture Toughness Charpy Impact Test Charpy Specimen Precracked Specimen Ultrasonic Fatigue 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • R. L. Tobler
    • 1
  • A. Bussiba
    • 2
  • J. F. Guzzo
    • 3
  • I. S. Hwang
    • 4
  1. 1.Materials Reliability DivisionNational Institute of Standards and TechnologyBoulderUSA
  2. 2.Nuclear Research Center-NegevBeer-ShevaIsrael
  3. 3.Welding Engineering DepartmentMinnesota Valley Engineering, Inc.New PragueUSA
  4. 4.Department of Materials Science and EngineeringMassachusetts Institute of TechnologyCambridgeUSA

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