Authors:

Hanhyun Kwak

Date Created:

Not specified

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Professor:

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About Paper:

Additively manufactured carbon fiber reinforced composite tool for thermoset composite layup is growing in demand due to the reduced cost and time, especially for large scale prototyping and small production runs compared to traditional metal tooling. Like other carbon fiber composite applications, it raises significant environmental concerns due to their end-of-life disposal in landfills. Despite their initial superior mechanical properties, recycled carbon fiber composites often exhibit degraded performance compared to virgin fibers. This research addressed the gap in understanding the performance of additively manufacturing recycled short carbon fiber thermoplastic composites, specifically their mechanical and thermal degradation over multiple reuse cycles. Extrusion Deposition Additive Manufacturing (EDAM) process was used to manufacture test specimens from pristine and recycled PESU-1810 pellets. The recycled pellets were fabricated through shredding and palletization. Throughout multiple artificial reuse cycles, dynamic mechanical analysis (DMA) was used to observe changes in viscoelastic behavior and digital scanning calorimetry (DSC) was used to observe any abnormalities in polymer crystallization. The fiber length distribution, tensile strength, and coefficient of thermal expansion (CTE) were also measured to quantify changes in mechanical properties. This research highlights the viability of recycling short carbon fiber thermoplastic composites. The results have significant implications for reducing environmental impact, enhancing material efficiency, and guiding industry standards for recycling practices. Keywords: Fiber Length; Composite Recycling; Extrusion Deposition Additive Manufacturing

Source:

Purdue University / 2024

Topics:

No topics listed

Co-authors:

Hanhyun Kwak