Function summary

       The automatic extensometer is mainly a device for automatically tracking and measuring the specimen deformation during the material tensile test。The measurement of automatic extensometer is divided into longitudinal measurement part and transverse measurement part. The longitudinal measurement part of automatic extensometer can automatically adjust the scale distance, automatically clamp or loosen the sample, and realize the measurement of the deformation of the sample length direction。The transverse measuring part of the automatic extensometer can automatically grip and loosen the sample in the width direction to measure the width deformation of the sample。According to the measured values, the elastic modulus, elongation after fracture, plastic strain ratio (r value) and tensile strain hardening index (n value) of metal sheet and thin strip can be obtained。

Relevant standard

• ISO 9513-2012 Metallic materials-Calibration of extensometer systems used in uniaxial testing

• JJG 762-2007 "Extensometer Verification Regulations"

• GB 12160-2002 "Calibration of extensometer for Uniaxial test"

• GB/T 5028-2008 "Determination of tensile Strain hardening Index (n value) of metal sheet and thin strip"

• GB/T 5027-2016 "Determination of Plastic strain ratio (R-value) of metal sheet and thin strip"
  

Technical parameter

Automatic extensometer (longitudinal) clamping arm: