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Damage Evolution in U-Shaped Composite Beams Loaded in Fatigue

RITIKA SINGH, MARK TUTTLE

Abstract


U-shaped laminated carbon-epoxy composite beams were subjected to fatigue loading. The fatigue load caused a well-defined bending moment and shear load to be applied to the curved section of the beam, resulting in a multiaxial state of stress in this region of the specimen. Stacking sequences were varied from one specimen to the next, and consequently the magnitude and orientation of the stresses induced in the curved section are expected to vary from one specimen to the next. During testing tension-tension fatigue loads were applied for 200,000 cycles, resulting in an increase in measured specimen compliance. The increase in compliance was due to matrix cracking that occurred in the curved section of the beam. Images of the damaged region obtained using computed x-ray tomography (CT-Scan) are presented.


DOI
10.12783/asc33/25995

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