Composite Materials Research Progress

254
Maria Pia Cavatorta and Davide Salvatore Paolino
energies up to a few impacts before perforation, when data show a rapid increase. Therefore,
by looking at the DuI values in the first impacts, no prediction can be made as to whether or
not laminate perforation will occur within test duration. In case of repeated impacts, DD data
can monitor the efficiency of energy absorption impact after impact. Results show that DD
values at the first impact are about the same, regardless of the impact energy. Moreover,
regardless of the final output of the test (no perforation/perforation), DD values show an
initial slight decrease followed by a rather constant phase. When perforation is to be achieved,
DD values start to increase a few impacts before final failure.
Acknowledgments
The Authors wish to acknowledge valuable discussions with professor Giovanni Belingardi.
References
[1] Roy, R; Sarkar BK; Bose NR. Impact fatigue of glass fibre-vinylester resin composites.
Composites Part A, 2001, 32, 871-876.
[2] Zhou, G. Static behaviour and damage of thick composite laminates. Composite
Structures, 1996, 36, 13-22.
[3] Zhou, G; Davies, GAO. Impact response of thick reinforced polyester laminates.
International Journal of Impact Engineering, 1995, 3, 357-374.
[4] Sutherland, LS; Guedes Soares, C. Effects of laminate thickness and reinforcement type
on the impact behaviour of E-glass/polyester laminates. Composites Science and
Technology, 1999, 59, 2243-2260.
[5] Azouaoui, K; Rechak, S; Azari, Z; Benmedakhene, S; Laksimi, A; Pluvinage, G.
Modelling of damage and failure of glass/epoxy composite plates subject to impact
fatigue. International Journal of Fatigue, 2001, 23, 877-885.
[6] Schoeppner, GA; Abrate, S. Delamination threshold loads for low velocity impact on
composite laminates. Composites Part A, 2000, 31, 903-915.
[8] Guden, M; Yildirim, U; Hall, IW. Effect of strain rate on the compression behaviour of a
woven glass fiber/SC-15 composite. Polymer Testing, 2004, 23, 719-725.
[9] Baucom, JN; Zikry, MA. Low-velocity impact damage progression in woven E-glass
composite systems. Composites Part A, 2005, 36, 658-664.
[10] Ambu, R; Aymerich, F; Ginesu, F; Priolo, P. Assessment of NDT interferometric
techniques for impact damage detection in composite laminates. Composites Science and
Technology, 2006, 66, 199-205.
[11] Okoli, OI. The effect of strain rate and failure modes on the failure energy of fibre
reinforced composites. Composite Structures, 2001, 54, 199-303.
[12] Belingardi, G; Grasso, F; Vadori, R. Energy absorption and damage degree in impact
testing of composite materials. Proceedings XI ICEM (Int. Conf. Experimental
Mechanics), Oxford (UK), 1998, 279-285.
[13] Belingardi, G; Vadori, R. Low velocity impact tests of laminate glass-fiber-epoxy matrix
composite materials plates. International Journal of Impact Engineering, 2002, 27,
213-229.