Journal
COMPOSITE STRUCTURES
Volume 258, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.113395
Keywords
Composite laminates; Damage mechanisms; Nanofiber; Acoustic emission; Fracture modes
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The study demonstrates that adding nanofibrous mats can significantly reduce damage mechanisms in carbon fiber reinforced polymers, including matrix cracking, fiber breakage, and fiber/matrix debonding. The combination of acoustic emission and scanning electron microscope techniques is useful for assessing the damage mechanisms.
Interleaving composite laminates with nanofibrous mat is one of the most reliable methods for increasing interlaminar fracture toughness. The present study seeks to find out how the damage mechanisms of carbon fiber reinforced polymers (CFRPs), subjected to the mode-I and mode-II fracture tests, are affected while those are modified by interleaved Polyamide 66 (PA66) electrospun layers. For this goal, acoustic emission (AE) and scanning electron microscope (SEM) techniques were used for assessing the damage mechanisms. The mode-I test results showed that adding nanofibers could decrease matrix cracking, fiber breakage, and fiber/matrix debonding by 92%, 27%, and 87%, respectively. The AE demonstrated that no fiber breakage occurred during mode-II loading in both non-modified and nanomodified specimens which was validated by SEM images. On the other hand, the two othOer damage modes, i.e. matrix cracking and fiber/matrix debonding, decreased about 97% in the nanomodified laminates.
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