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.
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References
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© 1992 Springer Science+Business Media New York
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Tobler, R.L., Bussiba, A., Guzzo, J.F., Hwang, I.S. (1992). Charpy Specimen Tests at 4 K. In: Fickett, F.R., Reed, R.P. (eds) Materials. Advances in Cryogenic Engineering, vol 38. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9050-4_27
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DOI: https://doi.org/10.1007/978-1-4757-9050-4_27
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