Strain field measurements can be conducted on all plain and curved surfaces of materials up to temperatures of 900°C. The 3D-method allows to distinct determination of displacements in x-, y- and z-direction. To measure the deformation the sample to be tested must be coated with a stochastic grid wich withstands the thermal and mechanical loading.
Specimen with stochastic grid
Calculated strain field
A circular test piece of a bi-metal consisting of a single crystalline and a poly crystalline material is deformed between 0.5 and 25 % showing inhomogeneous deformation.
The optical 3D-strain field measurement can be applied to
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