Jute and Luffa Fiber-Reinforced Biocomposites: Effects of Sample Thickness and Fiber/Resin Ratio on Sound Absorption and Transmission Loss Performance

Körük, Hasan; Ozcan, Ahmet; Genc, Garip; Şanlıtürk, Kenan Y.

doi:10.1080/15440478.2021.1907832

Cited by 9 publications

(9 citation statements)

References 56 publications

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“…In the first stage of the study, a design was made of the three types of filaments (PLA coconut, PLA birch, and PLA) and with the five types of infill density (20%, 40%, 60%, 80% and 100%) in order to characterize the acoustic performance of those three types of materials. Since the sound absorption coefficient is a ratio of reflected to incident sound energy, a value of 0 indicates complete reflection with no absorption [ 53 ]. On the other hand, the value of 1 of the absorption coefficients shows that all the sound energy is absorbed without reflection [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

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Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Zaharia,

Pop,

Cosnita

et al. 2023

Polymers

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The 3D printing process allows complex structures to be obtained with low environmental impact using biodegradable materials. This work aims to develop and acoustically characterize 3D-printed panels using three types of materials, each manufactured at five infill densities (20%, 40%, 60%, 80% and 100%) with three internal configurations based on circular, triangular, and corrugated profiles. The highest absorption coefficient values (α = 0.93) were obtained from the acoustic tests for the polylactic acid material with ground birch wood particles in the triangular configuration with an infill density of 40%. The triangular profile showed the best acoustic performance for the three types of materials analysed and, from the point of view of the mechanical tests, it was highlighted that the same triangular configuration presented the highest resistance both to compression (40 MPa) and to three-point bending (50 MPa). The 40% and 60% infill density gave the highest absorption coefficient values regardless of the material analyzed. The mechanical tests for compression and three-point bending showed higher strength values for samples manufactured from simple polylactic acid filament compared to samples manufactured from ground wood particles. The standard defects of 3D printing and the failure modes of the interior configurations of the 3D-printed samples could be observed from the microscopic analysis of the panels. Based on the acoustic results and the determined mechanical properties, one application area for these types of 3D-printed panels could be the automotive and aerospace industries.

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Section: Resultsmentioning

confidence: 99%

“…Since the sound absorption coefficient is a ratio of reflected to incident sound energy, a value of 0 indicates complete reflection with no absorption [ 53 ]. On the other hand, the value of 1 of the absorption coefficients shows that all the sound energy is absorbed without reflection [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Zaharia,

Pop,

Cosnita

et al. 2023

Polymers

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“…For instance, it has been reported that higher resin content would fill the pores and voids between the matrix and reinforcement and cause disruption in transmission and reduce noise absorption. 27 Thickness of the samples and amount of air gaps were also found to influence the sound absorption in biocomposites. 28 Creation of air channels between the reinforcing particles for air flow increases the resistivity and hence better sound absorption could be achieved.…”

Section: Changes In the Sound Absorption Coefficient Due To The Addit...mentioning

confidence: 98%

Non-Coking coal as an additive to enhance properties of groundnut shell reinforced polypropylene composites

Santosh

Chethan²,

Vasudev³

et al. 2023

Journal of Thermoplastic Composite Materials

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Groundnut shells (GNS) are renewable and sustainable sources that can reinforce polypropylene for composites intended for interior building and other applications. However, the hydrophilicity, low thermal and noise insulation of GNS reinforced polypropylene (PP) necessitate the use of additives to improve properties. In this work, non-coking bituminous coal was used as an additive to improve the properties of GNS-PP composites. Up to 30% of coal particles were included and the changes in tensile, flexural properties and noise and thermal insulation were studied. Morphological analysis showed limited interaction of coal with GNS or PP and consequently, there was only marginal improvement in the mechanical properties. However, moisture sorption of the composites decreased by 25% and the limited oxygen index increased to 27 from 24 without any coal. The presence of coal increases sound absorption and the noise absorption coefficient showed high absorption at specific frequencies. Coal is an abundantly available natural material which is suitable to improve the performance of composites.

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“…Moreover, the properties of 3D printing material are listed in Table S3 (Supporting Information). [27,30,[47][48][49][50][51][52][53]…”

Section: Meta-symbiotic Acoustic Functionmentioning

confidence: 99%

Biomimetic and Biophilic Design of Multifunctional Symbiotic Lichen–Schwarz Metamaterial

Saatchi

2023

Adv Funct Materials

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Noise and environmental problems are significant issues that affect human beings through the triggering of various stressors, including biological, chemical, physical, and psychological stressors. To address these issues, it is essential to develop environmentally friendly strategies, particularly in the field of materials manufacturing. This study presents a novel biomimetic and biophilic design of a lichen-Schwarz metamaterial (SLSM) that achieves multifunctional properties in noise attenuation and humidity control. The SLSM achieves acoustic and air humidifying multi-functions symbiotically through the use of triply periodic minimal surface (TPMS) and naturally occurring organic lichen. To attain partial or complete sound-blocking capabilities at specific frequencies, a Schwarz meta-symbiont in SLSM requires a parametric design of unit cell characteristics prior to 3D printing. The SLSM structure mimics a biomimetic shell and meta-symbiotic exoskeleton that safeguards the inner symbiont lichen by transitioning it from a dry and brittle state to a hydrated and flexible state during humidity control. The symbiotic lichen in SLSM offers superior sound attenuation across a broader frequency range and adds a unique function of humidity control, which is essential for sustainable architecture and multifunctional furniture in the forthcoming era of buildings.

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Jute and Luffa Fiber-Reinforced Biocomposites: Effects of Sample Thickness and Fiber/Resin Ratio on Sound Absorption and Transmission Loss Performance

Cited by 9 publications

References 56 publications

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Non-Coking coal as an additive to enhance properties of groundnut shell reinforced polypropylene composites

Biomimetic and Biophilic Design of Multifunctional Symbiotic Lichen–Schwarz Metamaterial

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