Vacuum Infusion Of A Composite E-glass
Vinylester Laminate For Nautical Application:
Experimental Response To Repeated Impacts
Author(s)
G. Belingardi, M. P. Cavatorta & D. S. Paolino
Abstract
The aim of this paper is to investigate the response to repeated impacts of a
non-symmetric glass fibre reinforced laminate. The laminate is intended for a
nautical application and the manufacturing technique is vacuum infusion. In a
first part of the work, four impact velocities (1.566 m/s, 2.215 m/s, 3.132 m/s
and 3.836 m/s) were considered, and a minimum of four specimens for any given
velocity were subjected to forty repeated impacts or up to perforation. The
impact response was evaluated in terms of damage progression by visual
observation of the impacted specimens, evolution of the peak force and of the
bending stiffness with the number of impacts and by calculating the damage
degree (ratio between the absorbed energy and the impact energy). In a second
part of the work, additional single impact tests were performed at 4.429 m/s and
6.264 m/s to investigate the laminate strain-rate sensitivity.
Repeated impact tests pointed out that the delamination area grows very
rapidly in the first few impacts to then level off, following closely the behaviour
of the bending stiffness against the number of impacts. The value of the peak
force increases in the first few impacts due to compaction and strain-hardening
of the resin with a related decrease of the damage degree. Comparison between
quasi-static penetration tests and impact tests demonstrates a strain-rate
dependency of the laminate bending stiffness and first damage load. The values
of R2 show a good fitness of a linear function on the experimental data.
Keywords: repeated impacts, strain rate, E-glass vinylester laminates, vacuum
infusion.
Keywords
repeated impacts, strain rate, E-glass vinylester laminates, vacuum
infusion.
Related Book
Other papers in this volume
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