Abstract
Adequate characterization of the internal geometry of random fiber composites for prediction of their properties requires acquisition and analysis of vast amount of data. The present work proposes a method to measure and quantify the internal geometry of ultra-thin chopped carbon fiber tape reinforced thermoplastics (UT-CTT), a kind of randomly oriented strands, using the X-ray micro-CT. The two-scale fiber orientation distributions (orientation of the tapes and of the fibers inside the tapes), tape morphology, 3D structure and orientation misalignment were characterized using a specialized image processing methodology. The results indicate that the applied method can provide detailed information like primary orientation directions, tape waviness and splitting of the internal geometry of UT-CTT. UT-CTTs produced with different molding pressure were studied to confirm the capability of the methodology in distinguishing subtle structure changes caused by different molding conditions.
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