Video extensometer for tensile tests on reinforcing steel

Advantages

• Enables longitudinal/transverse strain measurement on specimens with a falling off oxide or rust layer
  • No loss of measurement marks when surface layers are falling off
• Minimal requirements for specimen preparation and calibration
• Operates reliably even under challenging conditions
• Robust against slightly bent specimens
• Determination of strain distribution over the entire length
• Solid industrial housing

Evaluation software (in combination with material testing software LabMaster)

The strain measurement is contactless via a two-camera system. The signals from the two cameras are processed in real time using DIC (Digital Image Correlation) software.
The averaged deformation is typically determined between several measurement points. The determined deformation is displayed time-synchronously in the LabMaster material testing software, for example as a stress-strain curve, and is used, among other things, to determine the per-centage total extension at maximum force A_Gt and the elongation after fracture A₁₀, A₅, A_11,2.