首页|Strain measurement by means of clip-on extensometers during discontinuous plastic flow at 4 K
Strain measurement by means of clip-on extensometers during discontinuous plastic flow at 4 K
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NSTL
Elsevier
The clip-on extensometers are recommended by international standards (ASTM E 1450-16 or ISO 6892-4:2015) for tension testing of structural alloys at 4 K。 They are also frequently used to identify mechanical and electromechanical properties of superconducting wires or cables at cryogenic temperatures。 In this study， the time responses of clip-on extensometers during uniaxial tensile tests of the engineering materials at liquid helium temperature are analysed。 It turns out， that strong strain localization and self-excited vibrations of extensometers related to the plastic flow instability disturb the strain measurement。 These measurement artefacts may affect the identification of the mechanical parameters， such as the 0。2% proof stress or the total elongation。
NSTL
Elsevier
