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TECHNICAL PAPERS

Control of Damage in Composite Laminates by Ply-Stacking Designs: Characteristic Failure Signatures and Safety Criteria

[+] Author and Article Information
Vasyl Michael Harik

ICASE, MS 132C, NASA Langley Research Center, Hampton, VA 23681-2199

J. Eng. Mater. Technol 125(4), 385-393 (Sep 22, 2003) (9 pages) doi:10.1115/1.1605771 History: Received January 10, 2003; Revised June 17, 2003; Online September 22, 2003
Copyright © 2003 by ASME
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References

Figures

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A schematic for the incremental loading strategy and a generic failure signature with the associated load-drop sequence during a progressive failure of a composite laminate
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An example of the initial and final bi-axial failure envelopes (σx versus τxy) for a [90/+30/−30]s glass/epoxy laminate and the associated damage modes in the failed plies
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An example of a bi-axial failure envelope (σy versus σx) for the initial and final failures of the [0/+45/−45/90]s AS4 graphite/epoxy composite laminate and the associated damage modes
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The stress-strain curves with damage modes for a [0/+45/−45/90]s AS4 graphite/epoxy composite under bi-axial loading (σyx=2:1, after 12)
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The stress-strain curves for a [0/90]s laminate under a tensile loading, where theoretical predictions are shown by two solid lines, while experimental data is represented by dots 10
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A schematic of the cross-ply structure in a [02/90]s composite laminate
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A quarter of the unit cell for an E-glass/MY epoxy cross-ply composite 891011 shown with the original contour and a deformed mesh of finite elements (a) and a field of displacement vectors (b) for a tensile loading (Rf=1,H/Rf=8, and w/Rf=2)
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The tensile strain (εx) distribution (a), and the compressive Poisson’s strain, εy (b), in an MY epoxy matrix around an E-glass fiber predicted by the micromechanical FE model for a tensile loading (the dotted line is the original boundary, while Rf=1,H/Rf=8, and w/Rf=2)
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Distribution of the shear strain in an MY epoxy matrix around an E-glass fiber of a cross-ply composite subjected to a tensile loading (the dotted line is the original boundary, while Rf=1,H/Rf=8, and w/Rf=2)

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