Testing machine: Instron ElectroPuls E10,000 (Instron, Bucks, UK)
Samples shaped to dumbell shapes (working cross-sectional area ~3.5x5 mm, gauge length 30 mm). Accurate measurements taken immediately prior to testing.
Samples mounted in bespoke cryogrips
1 kN load cell
Data recording: 10 Hz
Sinusoidal waveform (between 1 and 5 MPa), increasing loading frequency in 0.2 Hz increments to a maximum of 2 Hz