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Extensometer
The extensometer is feeling specimen deformation sensor, strain gauge extensometer as simple principle, convenient installation type, there is a kind of widely used. According to the extensometer measurement object, can be divided into axial extensometer, lateral extensometer, clamp type extensometer.
Radial extensometer: for the detection of standard test pieces of radial shrinkage deformation, and axial extensometer matching was used for the determination of Poisson's ratio, the radial deformation (or transverse deformation in one direction) is converted into electricity, and then through the two meter measuring, recording or control of another device.
Clip type extensometer for detecting crack opening displacement. Clip type extensometer is one of the most commonly used instrument fracture mechanics experiment, it mainly used in the determination of fracture toughness test. The high precision, simple operation, convenient installation. The fracture of the specimen when the extensometer specimen can automatically disengage, suitable for static and dynamic deformation measurement.

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