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Open AccessArticle

Dynamic Mechanical Analysis on Delaminated Flax Fiber Reinforced Composites

1
School of Aerospace Engineering and Applied Mechanics, Tongji University, 1239 Siping Road, Shanghai 200092, China
2
Aerospace Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1, 1049001 Lisbon, Portugal
3
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai 200433, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(16), 2559; https://doi.org/10.3390/ma12162559
Received: 21 July 2019 / Revised: 5 August 2019 / Accepted: 9 August 2019 / Published: 11 August 2019
(This article belongs to the Section Advanced Composites)
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Abstract

It is well-known that the presence of the delamination in a plant fiber-reinforced composite is difficult to detect. However, the delamination introduces a local flexibility, which changes the dynamic characteristics of the composite structure. This paper presents a new methodology for composite laminate delamination detection, which is based on dynamic mechanical analysis. A noticeable delamination-induced storage modulus reduction and loss factor enhancement have been observed when the delaminated laminate was subjected to a forced oscillation compared to the intact composite laminate. For delamination area of 12.8% of the whole area of the composite laminate, loss factor of approximately 12% increase was observed. For near-to-surface delamination position, loss factor of approximately an 18% increment was observed. The results indicate that the delamination can be reliably detected with this method, and delamination position shows greater influence on the loss factor than that of the delamination size. Further investigations on different frequencies and amplitudes configurations show that the variation of loss factor is more apparently with low frequency as well as the low amplitude. View Full-Text
Keywords: dynamic mechanical analysis; delamination; plant fiber-reinforced composite; damping properties dynamic mechanical analysis; delamination; plant fiber-reinforced composite; damping properties
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Shen, Y.; Tan, J.; Fernandes, L.; Qu, Z.; Li, Y. Dynamic Mechanical Analysis on Delaminated Flax Fiber Reinforced Composites. Materials 2019, 12, 2559.

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