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Investigation of low velocity impact damage on filamentary composite materialsPresented are the results of an investigation of the effect of low velocity impact on the residual modulus and residual strength of flat filamentary composite materials. Theoretical analysis of composite materials indicates that the modulus of the material must decrease as impact damage increases. This decrease must also correlate to the decrease in residual strength. This study attempts to verify these hypotheses. Graphite/epoxy laminates (AS4/3501-6) of various fiber orientations (8 (0 deg), 2 (+ or - 45 deg)sub 8) were impacted using a falling weight impact tester. Impact energies ranged from 0.42 to 1.55 ft-lb, with impact velocities from 2.03 to 3.98 ft/sec. The results show that there is a reduction in residual modulus of the plate as the impact energy increases.
Document ID
19880006225
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bower, Mark V. (Alabama Univ. Huntsville, AL, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1987
Publication Information
Publication: NASA. Marshall Space Flight Center, Research Reports: 1987 NASA(ASEE Summer Faculty Fellowship Program
Subject Category
Composite Materials
Accession Number
88N15607
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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