Effect of processing temperature on the static and dynamic mechanical properties and failure mechanisms of flax fiber reinforced composites

Phoenix sp. fiber-reinforced epoxy composites have been manufactured using compression molding technique. The effect of reinforcement volume content (0%, 10%, 20%, 30%, 40%, and 50%) and size (300 µm particles, 10 mm, 20 mm, and 30 mm fibers) on quasi-static and dynamic mechanical properties was investigated. Moreover, the water absorption properties of composites were analyzed at different environmental conditions (10℃, 30℃, and 60℃). For each reinforcement size, composites loaded with 40% in volume show highest tensile and flexural properties. Furthermore, composites with 300 µm particles present the best impact properties and the lowest water absorption, regardless of the environmental condition. The dynamic mechanical properties of the composites loaded with 40% in volume were analyzed by varying the reinforcement size and the load frequency (i.e., 0.5 Hz, 1 Hz, 2 Hz, 5 Hz, and 10 Hz). It was found that the glass transition temperature of short fiber-reinforced composites is higher than that of the composite loaded with particles.

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

Polymers ◽

10.3390/polym13040559 ◽

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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Mercerization of Flax Fiber Improves the Mechanical Properties of Fiber-Reinforced Composites

International Journal of Polymeric Materials ◽

10.1080/00914030701328843 ◽

2008 ◽

Vol 57 (1) ◽

pp. 54-72 ◽

Cited By ~ 50

Author(s):

B. S. Kaith ◽

A. S. Singha ◽

Sanjeev Kumar ◽

Susheel Kalia

Keyword(s):

Mechanical Properties ◽

Flax Fiber ◽

Fiber Reinforced Composites ◽

Reinforced Composites ◽

Fiber Reinforced

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Experimental investigation on dynamic mechanical and thermal characteristics of Coccinia Indica fiber reinforced polyester composites

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925020905831 ◽

2020 ◽

Vol 15 ◽

pp. 155892502090583

Author(s):

Balu Sethuraman ◽

Sampath Pavayee Subramani ◽

Sathish Kumar Palaniappan ◽

Bhuvaneshwaran Mylsamy ◽

Karthik Aruchamy

Keyword(s):

Mechanical Properties ◽

Storage Modulus ◽

Fiber Length ◽

Natural Fiber ◽

Loss Modulus ◽

Fiber Reinforced Composites ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Dynamic Mechanical ◽

Coccinia Indica

Due to superior material properties of fiber reinforced composites, they are utilized in many structural fabrications. Even though many studies have been reported about various fiber reinforced composites, it is indeed to find more eco-friendly composites for modern applications. So, developing the new fiber reinforced composites and revealing its mechanical properties are vital. In this examination, the natural fiber reinforced polymer matrix composite was prepared by compression molding method. The natural fiber named as Coccinia Indica was used to fabricate the fiber reinforced composites. The impact of different fiber length on dynamic mechanical properties like loss modulus, storage modulus, and loss of weight in fiber reinforced composites was predicted using dynamic mechanical analysis and thermogravimetric analysis. The outcomes revealed that fiber length of 30 mm shows better values in storage modulus and nominal loss modulus owing to higher interfacial bonding among fiber and matrix. However, in other fiber lengths, the storage modulus depicts poor result and high loss modulus is due to inefficient stress transfer.

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Dynamic Mechanical Performance of Natural Fiber Reinforced Composites: A Brief Review

Applied Science and Engineering Progress ◽

10.14416/j.asep.2021.06.003 ◽

2021 ◽

Author(s):

Battula Durga Siva Deeraj ◽

Kuruvilla Joseph ◽

Jitha Santhakumari Jayan ◽

Appukuttan Saritha

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Mechanical Performance ◽

Natural Fiber ◽

Fiber Reinforced Composites ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Dynamic Mechanical ◽

Wide Range ◽

Structural Applications

Natural fiber reinforced polymer composite is a much focused area of study owing to its environmentally friendly nature and good mechanical properties. These composites offer comparable mechanical properties to that of steel and other composite materials. Dynamic mechanical analysis is a widely used technique to investigate the mechanical performance of fiber reinforced composites at a wide range of temperatures. Using this technique, the thermal transitions and damping properties of fiber reinforced composites too can be studied. These natural fiber composites are widely employed in structural applications in many industries. Here, in this short review we have presented the recent works on the dynamic properties of natural fiber reinforced composite materials with an essence of the influencing factors.

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Effectiveness of Sodium Acetate Treatment on the Mechanical Properties and Morphology of Natural Fiber-Reinforced Composites

Journal of Composites Science ◽

10.3390/jcs6010005 ◽

2021 ◽

Vol 6 (1) ◽

pp. 5

Author(s):

Dionisio Badagliacco ◽

Vincenzo Fiore ◽

Carmelo Sanfilippo ◽

Antonino Valenza

Keyword(s):

Mechanical Properties ◽

Sodium Acetate ◽

Mechanical Performance ◽

Flax Fiber ◽

Fiber Reinforced Composites ◽

Sodium Acetate Solution ◽

Acetate Solution ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Flax Fibers

This paper aims to investigate the ability of an eco-friendly and cheap treatment based on sodium acetate solutions to improve the mechanical properties of flax fiber-reinforced composites. Flax fibers were treated for 5 days (i.e., 120 h) at 25 °C with mildly alkaline solutions at 5%, 10% and 20% weight content of the sodium salt. Quasi-static tensile and flexural tests, Charpy impact tests and dynamical mechanical thermal (DMTA) tests were carried out to evaluate the mechanical properties of the resulting composites. Fourier transform infrared analysis (FTIR) was used to evaluate the chemical modification on the fibers surface due to the proposed treatment, whereas scanning electron microscope (SEM) and helium pycnometry were used to get useful information about the morphology of composites. It was found that the treatment with 5% solution of sodium acetate leads to the best mechanical performance and morphology of flax fiber-reinforced composites. SEM analysis confirmed these findings highlighting that composites reinforced with flax fibers treated in 5% sodium acetate solution show an improved morphology compared to the untreated ones. On the contrary, detrimental effects on the morphology as well as on the mechanical performance of composites were achieved by increasing the salt concentration of the treating solution.

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