2021 Volume 47 Issue 4 Pages 131-136
Although though carbon fiber reinforced plastics (CFRPs) have superior specific strength and stiffness, inadequate damping properties limit their usage. The objective of this study is to investigate the influence of the aspect ratio of the added cellulose nanofibers (CNFs) on the damping properties of plane-woven CFRP cloth. To investigate the effect of the fiber aspect ratio on the damping properties of the CFRP plates, four types of CNFs with varying aspect ratios were prepared. The results showed that the loss tangent (tan δ) of the CFRP plates slightly improved when CNFs, having a nominal aspect ratio of 1360, were added to the matrix. In contrast, free damping vibration test with cantilever beam revealed that high loss factor was remarked comparing to that of original specimen when the aspect ratio of CNFs was 1360. Therefore, when their nominal aspect ratio was moderate, the fiber bridges of the added CNFs prevented severe strain concentration in the matrix around the reinforcing carbon fibers. High vibration damping was obtained by preventing strain localization in the matrix, while agglomerations of added CNFs should be prevented.
