Implementation of the direct evaluation of strains using a phase analysis code for random patterns

Details Implementation of the direct evaluation of strains using a phase analysis code for random patterns Implementation of the direct evaluation of strains using a phase analysis code for random patterns

2011-09-09

arxiv.org/abs/1109.1898v1

Optics and Lasers in Engineering 49, 9 (2011) 1194-1200

Physics

Medical Physics

Scientific paper

10.1016/j.optlaseng.2011.04.016

A new approach for decoding directly strains from surfaces encoded with random patterns has been developed and validated. It is based on phase analysis of small region of interest. Here we adapt to random patterns new concepts proposed by Badulescu (2009) on the grid method. First metrological results are encouraging: resolution is proportional to strain level, being 9% of the nominal value, for a spatial resolution of 9 pixels (ZOI 64 \times 64 pixels2). Random noise has to be carefully controlled. A numerical example shows the relevance of the approach. Then, first application on a carbon fiber reinforced composite is developed. Fabric intertwining is studied using a tensile test. Over-strains are clearly visible, and results connect well with the previous studies

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