M00017047
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ISO DIS 6892-4 2014 Edition, July 2, 2014 METALLIC MATERIALS - TENSILE TESTING - PART 4: METHOD OF TEST IN LIQUID HELIUM
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Availability date: 07/14/2021
Description / Abstract:
This standard specifies the method of tensile testing of
metallic materials in liquid helium (the boiling point is – 269 °C
or 4,2 K, designated as 4 K) and defines the mechanical properties
that can be determined.
This standard may apply also to tensile testing at cryogenic
temperatures (less than –196 °C or 77 K), which requires special
apparatus, smaller test pieces, and concern for serrated yielding,
adiabatic heating, and strain-rate effects.
To conduct a tensile test according to this standard at 4 K, the
test piece installed in a cryostat is fully submerged in liquid
helium (He) and tested using displacement control at a nominal
strain rate of 10-3 s-1 or less.
NOTE The boiling point of the rare 3He isotope is 3,2 K. Usually
the tests are performed in 4He or a mixture of 3He and 4He with a
high concentration of 4He. Therefore the temperature is, as
designated before, 4 K.