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.

Date Published: 29 July 2002
PDF: 8 pages
Proc. SPIE 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, (29 July 2002); doi: 10.1117/12.484534

Published in SPIE Proceedings Vol. 4900:
Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life
Yuri V. Chugui; Sergei N. Bagayev; Albert Weckenmann; P. Herbert Osanna, Editor(s)