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. 2023 Jun 29;15(13):2888. doi: 10.3390/polym15132888

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Carbon fibers in an epoxy matrix. (a) Image of carbon fibers and their fragments after grinding (n = 2400 rpm, a_p = 0.2 mm, and v_f = 200 mm/min). (b) Close-up of the fracture surface of carbon fiber surrounded by an epoxy matrix.