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

scholarly journals Effect of Temperature and Water Absorption on Low-Velocity Impact Damage of Composites with Multi-Layer Structured Flax Fiber

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 453 ◽  
Author(s):  
Yiou Shen ◽  
Junjie Zhong ◽  
Shenming Cai ◽  
Hao Ma ◽  
Zehua Qu ◽  
...  
Keyword(s):  
Water Absorption ◽  
Structural Damage ◽  
Impact Damage ◽  
Damage Threshold ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Damage Resistance ◽  
The Impact

Temperature and moisture can cause degradation to the impact properties of plant fiber-based composites owing to their complex chemical composition and multi-layer microstructure. This study focused on experimental characterization of the effect of important influencing factors, including manufacturing process temperature, exposure temperature, and water absorption, on the impact damage threshold and damage mechanisms of flax fiber reinforced composites. Firstly, serious reduction on the impact damage threshold and damage resistance was observed, this indicated excessive temperature can cause chemical decomposition and structural damage to flax fiber. It was also shown that a moderate high temperature resulted in lower impact damage threshold. Moreover, a small amount of water absorption could slightly improve the damage threshold load and the damage resistance. However, more water uptake caused severe degradation on the composite interface and structural damage of flax fiber, which reduced the impact performance of flax fiber reinforced composites.

Influence of Loading Frequency on Thermal and Micro-Mechanical Damage During Fatigue of Flax Fiber Reinforced Composites

2020 ◽  
Author(s):  
Md. Zahirul Islam ◽  
Chad A. Ulven
Keyword(s):  
High Performance ◽  
Thermal Damage ◽  
Natural Fiber ◽  
Mechanical Damage ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Loading Frequency ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Self Heating

Abstract Like synthetic fiber reinforced composites, natural fiber reinforced composites possess a good potential to be used in high performance applications due to their good balance of mechanical and damping properties. Composite materials used in sporting goods equipment and automotive applications are subjected to repeating, regular loads. Therefore a clear understanding about the reliability of composite materials under fatigue/cyclic loading is important for their design in high performance applications. Currently, the fatigue performance of natural fiber reinforced composites are not well understood or characterized. The fatigue damage of flax fiber reinforced polymer matrix composites can be divided into two components: thermal damage due to self-heating in the sample and micro-mechanical damage due to damage creation (i.e. crack initiation, crack propagation, delamination, etc.). In this study, fatigue tests were conducted at four different loading frequencies and the two energy components defined were separated experimentally. The fatigue life of flax fiber reinforced composites was found to decrease with increasing loading frequency. Thermal damage due to the high self-heating temperature of the sample was found to be the main responsible form of energy which decreases fatigue life with increasing loading frequency. Micro-mechanical damage due to cyclic loading was not found to change significantly with increasing loading frequency.

Numerical and Experimental Characterization of the Dynamic Properties of Flax Fiber Reinforced Composites

2016 ◽  
Vol 08 (05) ◽  
pp. 1650068 ◽  
Author(s):  
Hajer Daoud ◽  
Jean-Luc Rebière ◽  
Amine Makni ◽  
Mohamed Taktak ◽  
Abderrahim El Mahi ◽  
...  
Keyword(s):  
Dynamic Properties ◽  
Element Model ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Viscoelastic Layer ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Damping Behavior ◽  
Modal Damping ◽  
Vibration Tests

In this paper, the damping properties of flax fiber reinforced composites were investigated. Throughout a series of resonance vibration tests, the natural frequencies and the modal damping were evaluated. A numerical modelling was also produced by using a finite element model to determine the energies dissipated in each layer of the laminate structure in order to calculate the damping factors. The results obtained for the dynamic properties of flax fiber reinforced composites from experimental data and numerical analysis method show close agreement. The effect of fiber orientations on the damping behavior for this material was investigated. Another part of our work was to insert a thin viscoelastic layer within the flax fiber laminate. The interposition of this viscoelastic layer had a significant influence on the vibration behavior, bending stiffness and damping factors.

scholarly journals An Innovative Treatment Based on Sodium Citrate for Improving the Mechanical Performances of Flax Fiber Reinforced Composites

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 559
Author(s):  
Vincenzo Fiore ◽  
Dionisio Badagliacco ◽  
Carmelo Sanfilippo ◽  
Riccardo Miranda ◽  
Antonino Valenza
Keyword(s):  
Mechanical Properties ◽  
Sodium Citrate ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Alkaline Solutions ◽  
Infrared Analysis ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Flax Fibers ◽  
Mechanical Performances

The goal of this paper is to evaluate the effectiveness of a cost-effective and eco-friendly treatment based on the use of sodium citrate (Na3C6H5O7) on the mechanical properties of flax fiber reinforced composites. To this scope, flax fibers were soaked in mildly alkaline solutions of the sodium salt at different weight concentration (i.e., 5%, 10% and 20%) for 120 h at 25 °C. The modifications on fibers surface induced by the proposed treatment were evaluated through Fourier transform infrared analysis (FTIR), whereas scanning electron microscope (SEM) and helium pycnometer were used to obtain useful information about composites morphology. The effect of the concentration of the treating solution on the mechanical response of composites was determined through quasi-static tensile and flexural tests, Charpy impact tests and dynamical mechanical thermal (DMTA) tests. The results revealed that composites reinforced with flax fibers treated in 10% solution exhibit the best mechanical performances as well as the lowest void contents. SEM analysis supported these findings showing that, by treating fibers in solutions with concentration up to 10%, composites having better morphology can be manufactured, in comparison to untreated ones. Conversely, higher Na3C6H5O7 concentrations negatively affect both the morphology and the mechanical properties of composites.

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