doi:10.1016/j.compstruct.2003.08.008
Copyright © 2003 Elsevier Ltd. All rights reserved.
Dynamic pulse-buckling behavior of ‘quasi-ductile' carbon/epoxy and E-glass/epoxy laminated composite beams
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Zheng Zhang and Farid Taheri 
, 
Department of Civil Engineering, Dalhousie University, P.O. Box 1000, Halifax, NS, Canada B3J 2X4
Available online 3 October 2003.
Abstract
Dynamic pulse-buckling response of carbon/epoxy and E-glass/epoxy laminated composite beams with [(±67.5)n]s ply sequence, subject to axial impact was investigated experimentally and numerically. The laminated beams deformed like ductile metals, retaining a residual deformed shape after being axially impacted, exhibiting no obvious delamination. The ‘crest' deflection of the beams was found to be linearly proportional to the impact energy. The numerical investigation showed that the beams' top and bottom surfaces experienced stresses (transverse stress component) in excess of the tensile strength limits of the matrices.
Author Keywords: Author Keywords: Composites; Angle lay-up; Pulse; Buckling; Axial impact; Momentum
Fig. 1. Test setup for the dynamic axial impact experiment.
Fig. 2. Residual deformed shape of carbon/epoxy laminated beams after impact.
Fig. 3. Deformed pulse-buckled profiles of aluminum beams subjected to axial impact [13].
Fig. 4. Typical pulse-buckled profiles and the initial shapes of carbon/epoxy specimens.
Fig. 5. Variation of the residual deflection versus impact energy.
Fig. 6. The variation of axial and bending stiffness versus with fiber angle.
Fig. 7. Time history results of the transverse stress component (σ2) taken at the beam mid-span for specimen CA1, impacted by a moving mass of M=0.518 kg with velocity of V0=3.92 m/s.
Fig. 8. Post-impact residual deformed shape of E-glass/epoxy laminated beams.
Fig. 9. Typical pulse-buckled profiles and the initial shapes of E-glass/epoxy specimens.
Fig. 10. Time history results of the transverse stress component (σ2) taken at the beam mid-span for specimen GA1, impacted by a moving mass of M=0.518 kg with velocity of V0=5.04 m/s.
Table 1. Physical and mechanical properties of the carbon and glass/epoxy laminate beams
Table 2. Impact specifications of the carbon/epoxy laminate beams
Table 3. Impact specifications of the E-glass/epoxy laminate beams
Corresponding author. Tel.: +1-902-494-3935; fax: +1-902-484-6635
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