FIELD: physics.
SUBSTANCE: images of two families of deformed fibres which are orthogonal before loading are superimposed and an image of the deformed mesh is obtained, from which the strain figure is analysed. The only sample deformed is that made from material having a marked fibrous microstructure, the family of fibres of which is parallel the axis of the sample before loading, and the positions of distorted deformations of fibres of a second family, which are orthogonal to the axis of the sample before deformation, are determined by calculation based on the condition of volume constancy.
EFFECT: more accurate and easier testing.
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