scholarly journals INVESTIGATION ON DIELECTRIC AND SOUND ABSORPTION PROPERTIES OF BANANA FIBERS REINFORCED EPOXY COMPOSITES

2016 ◽  
Vol 78 (6-10) ◽  
Author(s):  
Elammaran Jayamani ◽  
Sinin Hamdan ◽  
Pushparaj Ezhumalai ◽  
Muhammad Khusairy Bakri
Keyword(s):  
Dielectric Constant ◽  
Sound Absorption ◽  
Research Work ◽  
Absorption Coefficients ◽  
Absorption Properties ◽  
Banana Fiber ◽  
Fiber Loading ◽  
Banana Fibers ◽  
American Society ◽  
Impedance Tube Method

This research work focused on the development of banana fiber reinforced epoxy resin composites for dielectric and sound absorption applications. The dielectric and sound absorption properties of the composites were studied with respect to the fiber loading and treatment. The fibers were treated using 5wt % of sodium hydroxide at room temperature. The properties of the composites were measured using HP Impedance Analyzer E4980A and two-microphone transfer function impedance tube method according to the American Society for Testing Materials (ASTM D150-11 and ASTM E1050-12) standards. In general, the composites displayed higher dielectric constant and sound absorption coefficients at the higher fiber loading. In extend, the treated fibers reinforced composites showed higher sound absorption coefficients, but lower dielectric constant values

scholarly journals Influence of alkaline modification on selected properties of banana fiber paperbricks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abayomi A. Akinwande ◽  
Adeolu A. Adediran ◽  
Oluwatosin A. Balogun ◽  
Oluwaseyi S. Olusoju ◽  
Olanrewaju S. Adesina
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Moisture Absorption ◽  
Water Volume ◽  
Banana Fiber ◽  
Fiber Loading ◽  
Banana Fibers ◽  
Alkaline Modification

AbstractIn a bid to develop paper bricks as alternative masonry units, unmodified banana fibers (UMBF) and alkaline (1 Molar aqueous sodium hydroxide) modified banana fibers (AMBF), fine sand, and ordinary Portland cement were blended with waste paper pulp. The fibers were introduced in varying proportions of 0, 0.5, 1.0 1.5, 2.0, and 2.5 wt% (by weight of the pulp) and curing was done for 28 and 56 days. Properties such as water and moisture absorption, compressive, flexural, and splitting tensile strengths, thermal conductivity, and specific heat capacity were appraised. The outcome of the examinations carried out revealed that water absorption rose with fiber loading while AMBF reinforced samples absorbed lesser water volume than UMBF reinforced samples; a feat occasioned by alkaline treatment of banana fiber. Moisture absorption increased with paper bricks doped with UMBF, while in the case of AMBF-paper bricks, property value was noted to depreciate with increment in AMBF proportion. Fiber loading resulted in improvement of compressive, flexural, and splitting tensile strengths and it was noted that AMBF reinforced samples performed better. The result of the thermal test showed that incorporation of UMBF led to depreciation in thermal conductivity while AMBF infusion in the bricks initiated increment in value. Opposite behaviour was observed for specific heat capacity as UMBF enhanced heat capacity while AMBF led to depreciation. Experimental trend analysis carried out indicates that curing length and alkaline modification of fiber were effective in maximizing the properties of paperbricks for masonry construction.

Mechanical Behaviour of Sugarcane Bagasse and Banana Fibers Reinforced Composite

2015 ◽  
Vol 766-767 ◽  
pp. 104-109
Author(s):  
P. Parandaman ◽  
M. Jayaraman
Keyword(s):  
Sugarcane Bagasse ◽  
Mechanical Behaviour ◽  
Polymer Matrix Composites ◽  
Low Cost ◽  
Research Work ◽  
Absorption Capacity ◽  
Banana Fiber ◽  
Linear Pattern ◽  
Banana Fibers ◽  
Structural Applications

The present work investigates the effect of hybridization of sugarcane bagasse and banana fibers as reinforcements in the polymer matrix. Composites made from natural fibers possess favourable properties like low cost, light weight, high strength and eco-friendly nature compared to synthetic fibers. Structural applications such as aerospace and automobile industries moving towards the use of these natural composites. In this research work two lightweight composite materials were developed, one with a linear pattern and other with chopped pattern of sugarcane bagasse and banana fiber reinforcements. The developed composites were subjected to different tests to investigate their mechanical behaviour. Both the developed specimens were investigated for their tensile strength, hardness, and water absorption capacity and compared their behaviour. It is observed from the test results, the composite with the chopped fiber reinforcement possess better mechanical properties compared to the linear reinforcement.

scholarly journals The Use of Fabrics to Improve the Acoustic Absorption: Influence of the Woven Fabric Thread Density Over a Nonwoven

2018 ◽  
Vol 18 (3) ◽  
pp. 269-280 ◽  
Author(s):  
Pilar Segura-Alcaraz ◽  
Jorge Segura-Alcaraz ◽  
Ignacio Montava ◽  
Marilés Bonet-Aracil
Keyword(s):  
Sound Absorption ◽  
Woven Fabric ◽  
Acoustic Absorption ◽  
Human Beings ◽  
Absorption Coefficients ◽  
Acoustic Characteristics ◽  
Resistive Layer ◽  
Acoustic Absorption Coefficient ◽  
Impedance Tube Method

Abstract Noise is frequently unnoticed, but it is one of the causes of unhealth for human beings reducing people’s quality of life. There are many materials that can be considered as acoustic absorbents. Textiles can be used to both improve the acoustic quality of and to decorate the room where they have been placed. In this study, we used some fabrics with 15, 20 and 30 ends/cm and 15, 20 and 30 picks/cm. The acoustic absorption coefficient was measured when the fabric was added as a resistive layer on top of a nonwoven made of polyester fiber. Results evidence that these fabrics can be efficiently used to modify the acoustic absorption of the nonwoven. Sound absorption coefficients measured via the impedance tube method show that these modifications occur. The results show how it is possible to improve the acoustic characteristics of a simple nonwoven to obtain sound absorption coefficients close to values of 1 at different frequencies by choosing a fabric with the appropriate combination of warp and weft count.

scholarly journals Effect of Thickness, Density and Cavity Depth on the Sound Absorption Properties of Wool Boards

2018 ◽  
Vol 18 (2) ◽  
pp. 203-208 ◽  
Author(s):  
Hua Qui ◽  
Yang Enhui
Keyword(s):  
Sound Absorption ◽  
Raw Material ◽  
Wave Tube ◽  
Absorption Coefficients ◽  
Absorption Properties ◽  
Cavity Depth ◽  
Low Frequencies ◽  
High Frequencies ◽  
Standing Wave Tube ◽  
Better Than

Abstract A novel wool absorption board was prepared by using a traditional non-woven technique with coarse wools as the main raw material mixed with heat binding fibers. By using the transfer-function method and standing wave tube method, the sound absorption properties of wool boards in a frequency range of 250-6300 Hz were studied by changing the thickness, density, and cavity depth. Results indicated that wool boards exhibited excellent sound absorption properties, which at high frequencies were better than that at low frequencies. With increasing thickness, the sound absorption coefficients of wool boards increased at low frequencies and fluctuated at high frequencies. However, the sound absorption coefficients changed insignificantly and then improved at high frequencies with increasing density. With increasing cavity depth, the sound absorption coefficients of wool boards increased significantly at low frequencies and decreased slightly at high frequencies.

scholarly journals A Pilot Study on the Sound Absorption Characteristics of Chicken Feathers as an Alternative Sustainable Acoustical Material

2019 ◽  
Vol 11 (5) ◽  
pp. 1476 ◽  
Author(s):  
Asniawaty Kusno ◽  
Kimihiro Sakagami ◽  
Takeshi Okuzono ◽  
Masahiro Toyoda ◽  
Toru Otsuru ◽  
...  
Keyword(s):  
Pilot Study ◽  
Sound Absorption ◽  
Prediction Method ◽  
Fibrous Materials ◽  
Absorption Coefficients ◽  
Chicken Feathers ◽  
Absorption Performance ◽  
Flow Resistivity ◽  
Impedance Tube Method ◽  
Absorption Characteristics

This communication reports the results of a pilot study on the sound absorption characteristics of chicken feathers (CFs). Recently, demands for natural and sustainable materials have been extensively studied for acoustical purposes. CF has long been left wasted, however, they can be used for sound-absorbing purposes to improve acoustical environments as a sustainable and green acoustical material. In order to clarify their feasibility, samples of CF absorbers of various densities and thicknesses were prepared, and their sound absorption coefficients were measured by the standard impedance tube method. The measured results were also compared with those of conventional glass wools of the same densities and thicknesses. The results show that CFs have potentially good sound-absorption performance, which is similar to typical fibrous materials: increasing with frequency. Results of direct comparison with glass wool demonstrate that the absorption coefficients of CFs are comparable and, at some frequencies, somewhat higher than conventional glass wools in some cases. Additionally, the first step for searching a prediction method for the sound absorption performance of CFs, their flow resistivity was measured and a Delany–Bazley–Miki model was examined. However, the resultant flow resistivity was unexpectedly low, and the model gave only a much lower value than that measured. The reason for the discrepancies is the subject of a future study.

scholarly journals Effect of Bicomponent Fibers on Sound Absorption Properties of Multilayer Nonwovens

2017 ◽  
Vol 12 (4) ◽  
pp. 155892501701200
Author(s):  
Dilan Canan Çelikel ◽  
Osman Babaarslan
Keyword(s):  
Sound Absorption ◽  
Middle Layer ◽  
Absorption Coefficients ◽  
Absorption Properties ◽  
Cross Sectional ◽  
Bicomponent Fibers ◽  
Nonwoven Fabrics ◽  
Polyester Fibers ◽  
Absorption Performance ◽  
Round Cross

In this study sound absorption properties of multilayer nonwovens with bicomponent fibers have been derived compared with homocomponent fibers. Multilayer nonwovens obtained by polyester fibers consisted of three layers. The top and bottom layers were spunbonded nonwoven and middle layer was meltblown nonwoven sandwiched between them. Each layer was produced separately to compose unbonded three-layered nonwoven structures. Four different spunbonded nonwoven fabrics having a basis weight of 40 gsm made from four different polyester cross-sectional fibers (homocomponent round and trilobal, bicomponent round and trilobal). Five different meltblown nonwoven fabrics having five different basis weights ranging 100 gsm to 200 gsm were made from polyester round cross-sectional fibers. Spunbonded/ Meltblown/ Spunbonded (SMS) type unbonded multilayer nonwovens had basis weights ranging 180 gsm to 280 gsm. The effect of basis weight on sound absorption performance of multilayer nonwovens has been evaluated in the study. All results have been analyzed statistically. Results show that three-layered nonwoven structures including bicomponent fibers as outer layers had better sound absorption performance than nonwoven structures including homocomponent fibers. This effect becomes more significant as the basis weight increases, resulting insound absorption coefficients.

Multi-layered sound absorption structure composed of nonwoven fabrics and polyethylene membranes

2020 ◽  
pp. 152808372096195
Author(s):  
Xiaoning Tang ◽  
Xueting Liu ◽  
Xiansheng Zhang ◽  
Shangyong Zhang
Keyword(s):  
Sound Absorption ◽  
Nonwoven Fabric ◽  
Multilayered Structure ◽  
Acoustic Measurement ◽  
Stacking Sequence ◽  
Absorption Coefficients ◽  
Absorption Properties ◽  
Nonwoven Fabrics ◽  
Layer Stacking ◽  
Different Thickness

This work has focused on the improvement of the sound absorption properties of multilayered structure. Nonwoven fabrics with three different thickness were used to fabricate multilayered absorber. Polyethylene membrane was then incorporated into the multilayered structure with different combinations. The acoustic measurement indicated that polyethylene membrane can improve the sound absorption properties when the thickness of nonwoven fabric is 1.01 mm and 2.38 mm respectively. However, the incorporation of polyethylene membrane will decrease the sound absorption coefficients when the thickness of nonwoven fabric is 3.41 mm. This study has indicated that the thickness of nonwoven fabric and the layer stacking sequence should be focused on consideration to prepare multilayered sound absorber.

An Experimental and Simulation Studies on Sound Absorption Coefficients of Banana Fibers and their Reinforced Composites

2016 ◽  
Vol 12 ◽  
pp. 9-20 ◽  
Author(s):  
Muhammad Khusairy bin Bakri ◽  
Elammaran Jayamani ◽  
Soon Kok Heng ◽  
Sinin Hamdan ◽  
Akshay Kakar
Keyword(s):  
Absorption Coefficient ◽  
Empirical Model ◽  
Sound Absorption ◽  
Epoxy Composites ◽  
Sound Absorption Coefficient ◽  
Simulation Studies ◽  
Reinforced Composites ◽  
Banana Fiber ◽  
Banana Fibers ◽  
Flow Resistivity

This research focuses on the simulation of sound absorption coefficient of banana fiber and experimentation of sound absorption coefficient of banana fiber epoxy composites. For simulation, ‘Mechel’ empirical model was used to manipulate the flow resistivity and ‘Delany and Bazley’ empirical model was used to develop the prediction of sound absorption coefficient at frequency ranges from 500 Hz to 6000 Hz. For experimentation, two-microphone transfer function impedance tube model was used to analyze the sound absorption coefficient at frequency ranges from 500 Hz to 6000 Hz. Based on simulation, it is predicted and analyzed that the sound absorption coefficient of banana fiber found to be as high as 0.97 for the effects on the material thickness of banana fiber and 0.64 for the effects on the fiber diameter size and flow resistivity of banana fiber in the frequency ranges from 500 Hz to 6000 Hz. According to experimental results, it is observed and analyzed that the sound absorption coefficient of banana epoxy composites found to be as high as 0.11 for untreated banana epoxy composites and 0.12 for treated banana epoxy composites in the frequency ranges from 500 Hz to 6000 Hz.

scholarly journals Acoustic Panels Made of Paper Sludge and Clay Composites

2021 ◽  
Vol 13 (2) ◽  
pp. 637
Author(s):  
Tomas Astrauskas ◽  
Tomas Januševičius ◽  
Raimondas Grubliauskas
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Composite Panel ◽  
Sound Absorption Coefficient ◽  
Core Material ◽  
Paper Sludge ◽  
Frequency Range ◽  
Absorption Properties ◽  
Air Gaps ◽  
The Core

Studies on recycled materials emerged during recent years. This paper investigates samples’ sound absorption properties for panels fabricated of a mixture of paper sludge (PS) and clay mixture. PS was the core material. The sound absorption was measured. We also consider the influence of an air gap between panels and rigid backing. Different air gaps (50, 100, 150, 200 mm) simulate existing acoustic panel systems. Finally, the PS and clay composite panel sound absorption coefficients are compared to those for a typical commercial absorptive ceiling panel. The average sound absorption coefficient of PS-clay composite panels (αavg. in the frequency range from 250 to 1600 Hz) was up to 0.55. The resulting average sound absorption coefficient of panels made of recycled (but unfinished) materials is even somewhat higher than for the finished commercial (finished) acoustic panel (αavg. = 0.51).

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