Abstract
Residual fatigue strength for CFRP (carbon-fiber-reinforced plastic) laminates having impact damage is evaluated with the four-point bending test. A steel ball launched by an air gun collides against CFRP laminates to generate impact damage. The static and fatigue tests are performed to evaluate the residual strength of impacted laminates. After the experiments, the laminates are observed by optical and ultrasonic microscopes. As a result, the static and fatigue residual strengths are reduced compared with virgin laminates, particularly when the impacted side of the laminates is compressed. It is found that the cracks from the impact impression and the delaminations following the cracks influence the fracture of the laminates.
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