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A parametric study of variables that affect fiber microbuckling initiation in composite laminates. I - Analyses. II - ExperimentsThe effects of the stacking sequence (orientation of plies adjacent to the 0-deg plies), free surfaces, fiber/matrix interfacial bond strength, initial fiber waviness, resin-rich regions, and nonlinear shear constitutive behavior of the resin on the initiation of fiber microbuckling in thermoplastic composites were investigated using nonlinear geometric and nonlinear 2D finite-element analyses. Results show that reductions in the resin shear tangent modulus, large amplitudes of the initial fiber waviness, and debonds each cause increases in the localized matrix shear strains; these increases lead in turn to premature initiation of fiber microbuckling. The numerical results are compared to experimental data obtained using three thermoplastic composite material systems: (1) commercial APC-2, (2) QUADRAX Unidirectional Interlaced Tape, and AU4U/PEEK.
Document ID
19920069933
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Guynn, E. G.
(M.W. Kellogg Co. Houston, TX, United States)
Ochoa, Ozden O.
(NASA Langley Research Center Hampton, VA, United States)
Bradley, Walter L.
(Texas A & M University College Station, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Journal of Composite Materials
Volume: 26
Issue: 11, 1
ISSN: 0021-9983
Subject Category
Structural Mechanics
Accession Number
92A52557
Distribution Limits
Public
Copyright
Other

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