NDLI: Effect of low-speed impact damage and damage location on behavior of composite panels

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Effect of low-speed impact damage and damage location on behavior of composite panels

Content Provider	NASA Technical Reports Server (NTRS)
Author	Jegley, Dawn
Copyright Year	1992
Description	An investigation of the effects of low-speed impact damage on the compression and tension strength of thin (less than .05 inches thick) and moderately thick (between .12 and .17 inches thick) composite specimens was conducted. Impact speeds ranged from 50 to 550 ft/sec (impact energies from .25 to 30.7 ft-lb) and impact locations were near or away from a lateral unloaded edge. In this study, thin tension-loaded or compression-loaded specimens with only 90 deg and +/- 40 deg plies which were impacted away from the unloaded edge suffered less reduction in maximum load-carrying capability due to impact damage than the same specimens impacted near the unloaded edge. Unlike the thin laminates, failure loads of thicker compression-loaded specimens with a similar stacking sequence were independent of impact location. Failure loads of thin tension-loaded specimens with 0 deg plies were independent of impact location while failure loads of thicker compression-loaded specimens with 0 deg plies were dependent upon impact location. A finite-element analysis of strain distributions across the panel width indicated that high axial strains occur near the unloaded edges of postbuckled panels, indicating that impacts near the unloaded edge would significantly effect the behavior of postbuckled panels.
File Size	2010332
Page Count	24
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950022060
Archival Resource Key	ark:/13960/t0zp8z437
Language	English
Publisher Date	1992-09-01
Access Restriction	Open
Subject Keyword	Composite Materials Panels Low Speed Tensile Tests Compression Tests Compressive Strength Impact Tests Laminates Impact Loads Finite Element Method Graphite-epoxy Composites Buckling Aircraft Structures Failure Impact Damage Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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