Measurement of elasto-plastic deformations by speckle interferometry

Marco Bova; Luigi Bruno; Andrea Poggialini

doi:10.1117/12.871142

13 September 2010 Measurement of elasto-plastic deformations by speckle interferometry

Marco Bova, Luigi Bruno, Andrea Poggialini

Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73870F (2010) https://doi.org/10.1117/12.871142
Event: Speckle 2010, 2010, Florianapolis, Brazil

Abstract

In the paper the authors present an experimental equipment for elasto-plastic characterization of engineering materials by tensile tests. The stress state is imposed to a dog bone shaped specimen by a testing machine fixed on the optical table and designed for optimizing the performance of a speckle interferometer. All three displacement components are measured by a portable speckle interferometer fed by three laser diodes of 50 mW, by which the deformations of a surface of about 6×8 mm² can be fully analyzed in details. All the equipment is driven by control electronics designed and realized on purpose, by which it is possible to accurately modify the intensity of the illumination sources, the position of a PZT actuator necessary for applying phase-shifting procedure, and the overall displacement applied to the specimen. The experiments were carried out in National Instrument LabVIEW environment, while the processing of the experimental data in Wolfram Mathematica environment. The paper reports the results of the elasto-plastic characterization of a high strength steel specimen.

Citation Download Citation

Marco Bova, Luigi Bruno, and Andrea Poggialini "Measurement of elasto-plastic deformations by speckle interferometry", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73870F (13 September 2010); https://doi.org/10.1117/12.871142

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