Automated laser extensometer for full-field and local in-plane displacements and strain measurement

Leszek A. Salbut

doi:10.1117/12.484534

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29 July 2002 Automated laser extensometer for full-field and local in-plane displacements and strain measurement

Leszek A. Salbut

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Proceedings Volume 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life; (2002) https://doi.org/10.1117/12.484534
Event: Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, 2002, Novosibirsk, Russian Federation

Abstract

The novel type of automated laser full-field extensometer based on grating (moire) mterferometry is presented. It is designed for medium size field of view (6 x 4.5 mm2). The extensometer is mechanically and virtually (through software) integrated with a standard loading machine. It has possibility to control the load on the base of local on-line strain measurements. It enables the measurements during static, monotonic and cyclic loads and fill-field analysis of arbitrary sequence of images. The extensometer gives high contrast and good quality interferograms and is insensitive to vibrations and works with simple, low cost laser diode. The apparatus includes very convenient fringe pattern analysis software with possibilities to design the calculation protocol best fitted to specific measurement tasks. The capabilities of the extensometer are presented on the example of low cyclic fatigue testing of steel specimens with notch.

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Leszek A. Salbut "Automated laser extensometer for full-field and local in-plane displacements and strain measurement", Proc. SPIE 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, (29 July 2002); https://doi.org/10.1117/12.484534

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