The extensometer of the tensile machine is a sensor that senses the deformation of the test piece. The strain gauge type extensometer is currently a widely used type due to its simple principle and easy installation. According to the measurement objects, extensometers can be divided into axial extensometers, lateral extensometers, and clamp extensometers. Radial extensometer: It is used to detect the radial shrinkage deformation of the standard specimen. It is used with the axial extensometer to determine the Poisson's ratio μ. It converts the radial deformation (or the deformation in a certain transverse direction) into electricity, and then Measure, record or control another device through a secondary meter.
Clip-on extensometer: used to detect crack opening displacement. Clip-on extensometer is one of the most commonly used instruments in fracture mechanics experiments. It is mostly used in experiments to determine the fracture toughness of materials. High precision, convenient installation and simple operation. When the specimen is broken, the extensometer can automatically separate from the specimen, which is suitable for static and dynamic deformation measurement.
Axial extensometer: one of the instruments used for deformation measurement of various metallic and non-metallic materials.