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Proceedings Paper

Measurement of residual stresses in polymer composites using moire interferometry
Author(s): Krishnakumar Shankar; Huimin Xie; Anand Krishna Asundi; Kim Eng Oh; Gin Boay Chai
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Paper Abstract

Moire interferometry is employed along with the hole drilling technique to determine residual cure stresses in symmetric cross poly graphite epoxy laminates. Traditional moire interferometry set-up using two collimated angle beams was employed to provide the virtual reference grating while a cross grating with a frequency of 1200 lines per mm was replicated on the specimen surface. Holes of different depths, each one penetrating one additional layer of the laminate, were drilled using a high speed air turbine drill to relieve the stresses in each layer sequentially. The strain distribution around each hole was computed from correlation of the undistorted carrier fringe pattern with the distorted fringe patterns around the holes. The measured strain distributions are compared to residual strain distributions predicted by classical laminate theory.

Paper Details

Date Published: 13 June 2001
PDF: 6 pages
Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); doi: 10.1117/12.429571
Show Author Affiliations
Krishnakumar Shankar, Univ. of New South Wales (Australia)
Huimin Xie, Nanyang Technological Univ. (Singapore)
Anand Krishna Asundi, Nanyang Technological Univ. (Singapore)
Kim Eng Oh, Nanyang Technological Univ. (Singapore)
Gin Boay Chai, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4317:
Second International Conference on Experimental Mechanics
Fook Siong Chau; Chenggen Quan, Editor(s)

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