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Extensometer
Contact less and full field measurement of 3D displacements, strain and shape.Static - Dynamic - Mobile
Two digital cameras record the deformation process; the images are analysed with sub pixel accurate image correlation algorithms. For every object point (camera pixel) the 3D displacements and strain components (e.g. Exx, Eyy, Exy, E1 and E2) are calculated. Depending on the camera type, the system can be used for quasi static and highly dynamic events. The object's surface must have a stochastic pattern (natural or prepared). Rigid body movements are taken into account for the strain measurement.
Applications:
Material testing (Young's modulus, Poisson's ratio) at wood, metals, polymers,(metal) foams, rubber, composite materials.
Stability tests (component testing), tests with tensile test machines, validation of FEM simulations, crack propagation, dynamic tests.