03-08-2013, 02:00 PM
Axial Compressive Behavior Of a Stitched Carbon Fabric Reinforced Epoxy Matrix Composite With High Thickness
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ABSTRACT:
Carbon fiber reinforced composite materials are widely used in many applications from aircrafts to automotives. These laminates have different failure modes because of the material heterogeneity, which are generally influenced by the mechanical properties of the matrix and reinforcement. This paper examines the effect of thickness and aspect ratio on the crushing behavior, failure mode and its mechanisms .Optical and scanning electron microscopy (SEM) were done to examine the failure modes. Results reveal that the primary failure was shear failure initiated by the kink bands and delimitations between the carbon layers. The specimens also exhibit plastic micro buckling phenomena and delimitations that occur at the interface, followed by fiber fracture adding up to the failure mechanisms. Compressive strength and elastic modules were very sensitive to change in the aspect ratio. The specimens failed by the splitting mode or the delaminating mode as observed from the experimental results.