scholarly journals Correction: Effect of Hygrothermal Aging and Surface Treatment on the Dynamic Mechanical Behavior of Flax Fiber Reinforced Composites. Materials 2019, 12(15), 2376

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3405
Author(s):  
Xiaomeng Wang ◽  
Michal Petrů
Keyword(s):  
Mechanical Behavior ◽  
Surface Treatment ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Hygrothermal Aging ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Correction Effect ◽  
Composites Materials

The Y-axis in both Figure 3 and Figure 4 of [...]

scholarly journals Mechanical Behaviors of Flax Fiber-Reinforced Composites at Different Strain Rates and Rate-Dependent Constitutive Model

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 854 ◽  
Author(s):  
Dayong Hu ◽  
Linwei Dang ◽  
Chong Zhang ◽  
Zhiqiang Zhang
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Strain Rates ◽  
Reinforced Composites ◽  
Dynamic Mechanical ◽  
Rate Dependent ◽  
Dynamic Mechanical Behavior

Flax fiber-reinforced composites (FFRCs) exhibit excellent environmentally friendly qualities, such as light weight, low cost, recyclability, and excellent mechanical properties. Understanding the dynamic mechanical behavior of FFRCs could broaden their potential applications in lightweight, crashworthy, and impact-critical structures. This study presents a study on the fabrication of FFRCs by vacuum-assisted resin infusion. The dynamic stress–strain responses of the fabricated specimens at strain rates ranging from 0.006 s-1 to 2200 s-1 were evaluated using quasi-static tests and the Split–Hopkinson pressure bar (SHPB). The results indicated that the FFRC exhibited superior strain rate sensitivity. Final deformation photographs and scanning electron micrographs clearly revealed the damage evolution of the FFRC specimens, as well as various failure mechanisms, including fiber–matrix debonding, fiber pull-out, and fiber fracture at different strain rates. On the basis of the experimental results, a simplified Johnson–Cook model was established to describe the strain-rate dependent constitutive model of FFRC. The validation of the suggested constitutive model was embedded in the finite element simulations and could well repeat the strain wave observed from the experiment results. Finally, the quasi-static compression and drop-hammer impact of pyramidal lattice structures with FFRC cores were investigated both numerically and experimentally, proving the effectiveness of the simplified Johnson–Cook model. This study could potentially contribute to a deeper understanding of the dynamic mechanical behavior of FFRCs and provide fundamental experimental data for future engineering applications.

scholarly journals Effect of Hygrothermal Aging and Surface Treatment on the Dynamic Mechanical Behavior of Flax Fiber Reinforced Composites

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2376 ◽  
Author(s):  
Wang ◽  
Petrů
Keyword(s):  
Mechanical Behavior ◽  
Surface Treatment ◽  
Flax Fiber ◽  
Fiber Reinforced Polymer ◽  
Damping Properties ◽  
Fiber Reinforced ◽  
Hydrothermal Aging ◽  
Hygrothermal Aging ◽  
Dynamic Mechanical Behavior ◽  
Reinforced Polymer

The recent developments of FRP (fiber reinforced polymer) are towards the growth and usage of natural FRP in the field of engineering due to both environmental and economic benefits. Flax fiber is one of the most commonly used natural fibers. One of the critical factors affecting the mechanical behavior of FFRP (flax fiber reinforced polymer) is hygrothermal aging. Some experimental works have been conducted to investigate the effect of hydrothermal aging on static behavior of FFRP. However, fewer efforts have been made to study its damping properties after hydrothermal aging. In this paper, the effect of surface treatment (including alkalization, silanization, acetylation and alkali-silanization) on dynamic mechanical behavior of FFRP under hygrothermal aging is studied. The results show that water resistance and damping properties of FFRP are improved after surface treatment. The acetylation treated FFRP exhibits excellent damping performance among all treated specimens.

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.

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