The effect of fibre modulus and surface treatment on the modulus, damping and strength of carbon-fibre-reinforced plastics

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Abstract
The influence of fibre modulus and surface treatment on the modulus, damping and strength of unidirectional, cross-ply (0°/90°) and ±15° angle-ply laminates has been investigated. Fibre modulus was the dominating parameter when the fibres lay in or near the direction of the direct stresses. In general, the higher the fibre modulus, the higher was the composite modulus and the lower was the damping. Surface treatment affects the properties when the tensile or shear bond between the fibre and the matrix becomes important, eg in the flexural strength of 90° specimens. However, the damping is not significantly affected by surface treatment since the test stresses did not put the bond into jeopardy. Different lamination geometries and fibre moduli may be used to give the same stiffness in one direction, but quite different damping values. In flexure, for example, a 0° specimen with a Young's modulus of 100 GN m−2 has a specific damping capacity of about 035%, whereas a ±15° angle-ply composite with the same stiffness has about four times more damping.