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)


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.


Fracture Toughness Charpy Impact Test Charpy Specimen Precracked Specimen Ultrasonic Fatigue 
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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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