Effects of joining techniques on impact perforation resistance of assembled composite plates |
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Authors: | D Liu B B Raju |
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Institution: | (1) Department of Materials Science and Mechanics, Michigan State University, 48824 East Lansing, MI;(2) U.S. Army Tank-automotive Research, Development & Engineering Center, 48397 Warren, MI |
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Abstract: | A previous study on impact response of composite laminates concluded that impact perforation was the most important damage
stage in composite laminates subjected to impact loading, since impact characteristics (peak force, contact duration and absorbed
energy) and mechanical properties degradation of composite laminates reached critical points once perforation took place.
It was also found that thickness had a greater influence on impact perforation resistance than did in-plane dimensions. However,
as the composite laminates became very thick, the manufacturing cost for obtaining high-quality composite laminates increased.
In an effort to meet design requirements and reduce manufacturing costs, assembled composite plates, which were organized
by assembling multiple thin composite laminates, were considered as alternatives for thick single-laminate composite plates.
Various joining techniques including mechanical riveting, adhesive bonding and stitch joining, and their combinations, were
used in assembling two- and three-laminate plates. Experimental results revealed that adhesive bonding outperformed other
joining techniques. Although good bonding resulted in higher joining (bending) stiffness and subsequently higher perforation
thresholds, increasing the laminate thickness or the number of laminates was found to be more efficient in raising perforation
threshold than in improving the joining stiffness. The assembled three-laminate plates were found to have higher perforation
thresholds than their thick single-laminate counterpart. |
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Keywords: | Composites joining impact perforation energy absorption |
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