Dynamic mechanical analysis of pure and fiber-reinforced thermoset- and thermoplastic-based polymers and free volume-based viscoelastic modeling

2018 ◽  
Vol 41 (1) ◽  
pp. e201800007 ◽  
Author(s):  
Loredana Kehrer ◽  
Daniel Wicht ◽  
Jeffrey T. Wood ◽  
Thomas Böhlke
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Free Volume ◽  
Mechanical Analysis ◽  
Fiber Reinforced ◽  
Dynamic Mechanical ◽  
Viscoelastic Modeling

scholarly journals Dynamic Mechanical Analysis on Delaminated Flax Fiber Reinforced Composites

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2559 ◽  
Author(s):  
Yiou Shen ◽  
Jiayi Tan ◽  
Luis Fernandes ◽  
Zehua Qu ◽  
Yan Li
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Loss Factor ◽  
Composite Laminate ◽  
Low Frequency ◽  
Mechanical Analysis ◽  
Fiber Reinforced ◽  
Dynamic Mechanical ◽  
Reinforced Composite ◽  
Local Flexibility ◽  
Low Amplitude

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.

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