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Characterization of damage modes in impacted thermoset and thermoplastic compositesComposite materials remain extremely vulnerable to out-of-plane impact loads, which may lead to severe losses in strength and stiffness. Impact induced damage is often a complex mixture of transverse cracks, delaminations and fiber failures. An experimental investigation was undertaken to quantify damage tolerance and resistance in composite materials impacted using the drop-weight method. Tests were conducted on laminates of several different carbon-fiber composite systems such as epoxies, modified epoxies, and amorphous and semicrystalline thermoplastics. In this paper, impacted composite specimens have been examined using destructive and nondestructive techniques to establish the characteristic damage states. Specifically, optical microscopy, ultrasonic and scanning electron microscopy techniques have been used to identify impact induced damage mechanisms. Damage propagation during post impact compression was also studied.
Document ID
19930026556
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Srinivasan, K.
(Old Dominion Univ. Norfolk, VA, United States)
Jackson, W. C.
(U.S. Army, Aerostructures Directorate; NASA, Langley Research Center Hampton, VA, United States)
Smith, B. T.
(College of William and Mary Williamsburg, VA, United States)
Hinkley, J. A.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Journal of Reinforced Plastics and Composites
Volume: 11
Issue: 10
ISSN: 0731-6844
Subject Category
Structural Mechanics
Accession Number
93A10553
Funding Number(s)
CONTRACT_GRANT: NAG1-569
CONTRACT_GRANT: NAG1-1063
Distribution Limits
Public
Copyright
Other

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