Abstract
Instrumented drop-weight impact testings were conducted in conjunction with the ultrasonic C-scan and scanning electron microscopy to characterize the impact re sponse at low velocities. Thermoplastic composite materials in the simply supported case showed dramatic improvements in impact damage resistance compared to the thermoset composite materials as reported. Scanning electron microscopy examination of the frac ture surface revealed fiber-matrix-debonding, fiber pull-out, and few deleminations. Matrix behavior can be characterized by a hackly appearance. On the other hand, the frac ture mechanisms of the transverse normal compression and shear punch were matrix cracking and grouped lamina delamination as opposed to individual lamina delamination, respectively.
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