Abstract
With present concern being directed towards fatigue performance of CFRP materials, it is important to understand the causes of damage initiation and propagation, damage mechanisms and the effect of flaws upon material properties. Such information is needed in order to identify what actually constitutes ‘failure’in CFRP materials, so that this may be adequately defined and reliable design criteria established. This chapter first describes a finite element (FE) analysis to predict damage-causing stresses and a suitable specimen configuration, and, thereafter, investigates the effect upon material properties of small specimens as damage progresses. The principal type of damage found was delamination, which caused an increase in damping and a reduction in static stiffness and natural frequency. Scanning electron microscopy, ultrasonic scanning and thermography techniques were used to investigate damage type and mechanism.
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