Morphological and mechanical behavior of polyurethane/epoxy interpenetrating polymers and its flax fiber‐reinforced composites

2020 ◽  
Author(s):  
Zehua Qu ◽  
Binbin Zhao ◽  
Jing Wang ◽  
Xiaoxia Pan ◽  
Xiaoyue Hu ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced

Damage mechanisms characterization of flax fibers–reinforced composites with interleaved natural viscoelastic layer using acoustic emission analysis

2019 ◽  
Vol 53 (18) ◽  
pp. 2623-2637 ◽  
Author(s):  
Abderrahim El Mahi ◽  
Hajer Daoud ◽  
Jean-Luc Rebiere ◽  
Isabelle Gimenez ◽  
Mohamed Taktak ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Mechanical Behavior ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Viscoelastic Layer ◽  
Uniaxial Tensile ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Viscoelastic Composite ◽  
The Impact

In this paper, the static and fatigue behavior of flax fiber-reinforced composites with and without an interleaved natural viscoelastic layer are investigated. Viscoelastic composite plates consist of a soft natural viscoelastic layer which is confined between two identical flax fiber reinforced composites. Different stacking sequences of specimens are tested with uniaxial tensile loading until failure. The mechanical behavior and the acoustic activity of damage sources in various configurations with and without a viscoelastic layer are compared. The analysis of acoustic emission signals and the macroscopic and microscopic observations led to the identification of the main acoustic signatures of different damage modes dominant in each type of composites (with and without a viscoelastic layer). These results allow better identification of the influence of the impact of a viscoelastic layer on the mechanical behavior of different composites. In addition, static and fatigue flexural behavior of unidirectional composites with and without viscoelastic layer are characterized in 3-point bending tests. The effects of viscoelastic layer on the stiffness, hysteresis loops, and loss factor are studied for various numbers of cycles during cyclic fatigue.

Study of the time varying properties of flax fiber reinforced composites

2018 ◽  
Author(s):  
Constantin Stochioiu ◽  
Ameur Chettah ◽  
Benoit Piezel ◽  
Stéphane Fontaine ◽  
Horia-Miron Gheorghiu
Keyword(s):  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Time Varying ◽  
Reinforced Composites ◽  
Fiber Reinforced
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