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Advances in Materials Science and Engineering
Volume 2014, Article ID 390965, 9 pages
http://dx.doi.org/10.1155/2014/390965
Research Article

Optical Evaluation on Delamination Buckling of Composite Laminate with Impact Damage

1School of Mechanical Engineering, Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin Polytechnic University, Tianjin 300387, China
2Department of Mechanical Engineering, University of Cagliari, Cagliari 09123, Italy
3Department of Mechanics, Tianjin University, Tianjin 300072, China

Received 16 October 2013; Revised 23 January 2014; Accepted 27 January 2014; Published 6 March 2014

Academic Editor: Jun Liu

Copyright © 2014 J. T. Ruan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The delamination buckling and growth behaviors of a cross-ply composite laminate with damage induced by low velocity impact are investigated optically using three-dimensional digital image correlation (3D-DIC) method. For the 3D deformation measurement, the 3D-DIC setup comprised of two CCD cameras was adopted. The rectangle specimen was impacted under the impact energy of 7.0 J using a drop-weight testing machine, and the impact damage was detected by means of X-ray nondestructive evaluation (NDE) technique. The 3D deformation field measured with the optical system clearly reveals that the delamination buckling characteristic of the specimen mainly appears local deformation mode under compression after impact test. Moreover, the behavior of delamination growth evaluated by the 3D-DIC optical method reasonably agrees with the NDE observed damage result after compression.