Effect of alkali treatment on the flexural properties ofHildegardia fabric composites

2006 ◽  
Vol 102 (2) ◽  
pp. 1297-1302 ◽  
Author(s):  
B. R. Guduri ◽  
A. V. Rajulu ◽  
A. S. Luyt
Keyword(s):  
Alkali Treatment ◽  
Flexural Properties ◽  
Fabric Composites

Effect of alkali treatment on the flexural properties of a Luffa cylindrica-reinforced epoxy composite

2018 ◽  
Vol 25 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Niharika Mohanta ◽  
Samir K. Acharya
Keyword(s):  
Flexural Strength ◽  
Treatment Time ◽  
Saline Water ◽  
Fiber Composite ◽  
Alkali Treatment ◽  
Fiber Composites ◽  
Subzero Temperature ◽  
Flexural Properties ◽  
Luffa Cylindrica ◽  
Untreated Fiber

AbstractThis experimental study was conducted to investigate the effect of NaOH concentration and treatment time on the flexural properties ofLuffa cylindricafiber-reinforced epoxy composites. Significant improvement (up to 84.92%) in the flexural properties for the treated fiber composite compared with the untreated fiber composite was observed. Both treated and untreated fiber composites were then subjected to different environmental treatments (saline water, distilled water, and subzero temperature). To find out the changes in flexural strength immediately after treatment, the same test was carried out on the composites. Degradation in the flexural strength of both treated and untreated fiber composites, when subjected to environmental treatments, was observed. They were found within the range of 2%–20% and were found to be least in subzero treatment. The SEM micrograph indicates that alkali treatment is effective in improving the adhesion between the fiber and matrix.

Mechanical properties of polyester/corn husk fibre composite produced using vacuum infusion technique

2021 ◽  
Vol 29 (9_suppl) ◽  
pp. S1532-S1540
Author(s):  
Shibly Shadik Mir Md ◽  
Ming Yeng Chan ◽  
Seong Chun Koay
Keyword(s):  
Mechanical Properties ◽  
Fibre Composite ◽  
Alkali Treatment ◽  
Flexural Modulus ◽  
Fibre Length ◽  
Flexural Properties ◽  
Vacuum Infusion ◽  
Corn Husk ◽  
Plastic Composite ◽  
Polyester Composites

Issues pertaining to deforestation, environmental pollution and natural wastes are increasing day by day. These issues can be resolved by introducing a new composite material, in which natural waste is used as fibre and as a replacement of wood plastic composite. The different lengths (3, 6 and 9 cm) of corn husk fibre filled polyester composites were produced using the vacuum infusion method. Several mechanical properties of these polyester composites, such as tensile and flexural properties, were evaluated. The results revealed that both the tensile and flexural properties of polyester composites increased with increment of corn husk fibre length from 3 to 6 cm. However, the results decreased for 9 cm of fibre length filled composites. Similar trends were recorded after alkali treatment of the corn husk fibre filled polyester composites. The alkali treatment with sodium hydroxide had improved the tensile strength (33%), Young’s modulus (23%), elongation (14%), flexural strength (42%) and flexural modulus (8.5%) of the polyester/corn husk fibre composites with 6 cm of fibre length by enhancing the mechanical interlocking bonding between treated corn husk fibres and polyester.

A parametric investigation into the flexural properties of singly curved composites reinforced with 3D-integrated woven fabrics

2018 ◽  
Vol 49 (10) ◽  
pp. 1411-1439
Author(s):  
Tohid Dastan ◽  
Sayyed MAHDI Hejazi ◽  
Mohammad Sheikhzadeh
Keyword(s):  
Total Energy ◽  
Energy Absorption ◽  
Peak Load ◽  
Woven Fabric ◽  
Composite Sample ◽  
Flexural Properties ◽  
Woven Fabric Composites ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Foam Filling

In this study, the effect of curvature on the flexural behavior of 3D integrated woven fabric composites was initially investigated. After optimizing the effect of curvature, two strengthening methods (thickening upper skin and foam-filling) were applied on curved 3D integrated woven fabric composites separately and simultaneously. Normalized-weight flexural properties were used as an efficiency index to analyze and compare the efficiency of both methods. Results showed that as curvature increases from 0 to 0.007 and 0.014 cm−1, peak load increases about 29.8 and 36.7%, respectively. In addition, as upper skin thickness increases, most of flexural properties increase and then decrease. Moreover, flexural properties improved by injecting polyurethane foam into the empty core. Furthermore, applying both methods on curved 3D integrated woven fabric composite sample made an outstanding improvement in flexural properties. That is, the flexural peak load, stiffness, and total energy absorption increased 244.4, 142.7, and 496.4%, respectively, in comparison to the unreinforced 3D integrated woven fabric composite sample. Based on the normalized results, it could be concluded that applying thickening upper skin and foam-filling the core methods separately have no considerable improvement in specific flexural properties; however, applying both methods simultaneously improved specific peak load and specific total energy absorption 35.3 and 134.1%, respectively.

Tensile and flexural properties of glass and carbon fibre composites reinforced with silica nanoparticles and polyethylene glycol

2019 ◽  
Vol 49 (6) ◽  
pp. 809-832
Author(s):  
Erdem Selver
Keyword(s):  
Polyethylene Glycol ◽  
Carbon Fibre ◽  
Silica Nanoparticles ◽  
Composite Laminates ◽  
Shear Thickening ◽  
Flexural Properties ◽  
Fibre Composites ◽  
Fabric Composites ◽  
Shear Thickening Fluids ◽  
Carbon Fibre Composites

This paper attempts to show the effect of silica nanoparticles and polyethylene glycol mixture (shear thickening fluids) on tensile and flexural properties (3-point bending) of glass and carbon fibre-reinforced thermoset composite laminates. The shear thickening fluids were prepared by combination of silica nanoparticles and polyethylene glycol using various silica contents (10–20 wt%). A viscometer was used to evaluate the shear thickening characteristics and viscosity of shear thickening fluids increased by increasing the silica content. Shear thickening fluids were impregnated on the host of glass and carbon fabrics and subsequently converted to composite laminates using vacuum infusion method with an epoxy matrix. It was found that shear thickening fluids-treated carbon and glass fabric composites exhibited up to 10% and 12% higher tensile strength than neat composites whilst the tensile modulus increased about 24%. Shear thickening fluids-treated fabric composites exhibited slower damage propagation compared to brittle nature of untreated fabric composites. However, lower flexural strength with higher energy absorption (up to 27%) were obtained after using shear thickening fluids for both carbon and glass fibre composites.

Research on Mechanical Properties of Warp Knitted Spacer Fabric Composites

2011 ◽  
Vol 332-334 ◽  
pp. 1760-1763 ◽  
Author(s):  
Xiao Hong Ma ◽  
Zhi Gang Qin
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Unsaturated Polyester ◽  
Testing Machine ◽  
Automatic Testing ◽  
Flexural Properties ◽  
Fiber Volume ◽  
Spacer Fabric ◽  
Fabric Composites ◽  
Properties Of Composites

Two kinds of warp-knitted spacer fabrics are knitted on a Raschel latch needle warp knitting machine with glass continuous-filament yarns. The glass/ unsaturated polyester resin composites are produced by manual molding technology. The tensile and flexural properties of composite specimens are tested in automatic testing machine. The tensile and flexural properties of composites are analyzed in the course, wale and diagonal directions. The results show that mechanical properties of composites possess obvious orthotropic characteristics; the differences of fiber volume fraction and yarn orientations result in the different tensile mechanical of composites. Warp-knitted spacer fabric composites revealed good flexural mechanical properties.

The influence of alkali treatment on date seeds powder reinforced LLDPE composites: Flexural properties and impact strength

2020 ◽  
Author(s):  
Abduati Elnaid ◽  
N. Z. Noriman ◽  
Omar S. Dahham ◽  
R. Hamzah ◽  
M. A. Azizan ◽  
...  
Keyword(s):  
Impact Strength ◽  
Alkali Treatment ◽  
Flexural Properties ◽  
Date Seeds Powder

Effects of Sawdust Content and Alkali Treatment on Mechanical and Flame Retarding Properties of Sawdust/Recycled High Density Polyethylene Composites

2014 ◽  
Vol 970 ◽  
pp. 79-83
Author(s):  
Rapisa Jarapanyacheep ◽  
Kasama Jarukumjorn
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flame Retardancy ◽  
High Density Polyethylene ◽  
Interfacial Adhesion ◽  
Alkali Treatment ◽  
Tensile Modulus ◽  
High Density ◽  
Flexural Properties ◽  
Elongation At Break

Sawdust/recycled high density polyethylene (rHDPE) composites were prepared and their mechanical properties, flammability and morphology were investigated. Sawdust was used at contents of 30, 40 and 50 wt%. With increasing sawdust content, tensile strength and elongation at break of the composites decreased whereas tensile modulus increased. Flexural properties showed the same trend as tensile properties. Flammability of the composites enhanced with increasing sawdust content. Mechanical properties of alkali treated sawdust/rHDPE composites were higher than those of untreated sawdust/rHDPE composites at all sawdust contents. Moreover, alkali treatment improved flame retardancy of the composites. SEM micrographs showed that alkali treatment enhanced the interfacial adhesion between sawdust and rHDPE matrix.

Impact performances of monoaxial knitted fabric composites

2021 ◽  
pp. 002199832098887
Author(s):  
İlkkar Karaoglu ◽  
Tuba Alpyildiz
Keyword(s):  
Flexural Properties ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Fabric Reinforcement ◽  
Damage Area ◽  
Compression After Impact ◽  
Fabric Composites ◽  
Out Of Plane ◽  
Weight Impact ◽  
The Impact

This study aims to investigate the impact performances of the monoaxial knitted fabric composites to evaluate the effect of straight yarns within the reinforcement knitted fabric. Monoaxial knitted fabric composites have enhanced in-plane properties and it is important to evaluate the effect of yarn insertion on the impact performances because knitted fabric composites are preferred due to their out-of-plane properties. Bending, impact and compression after impact (CAI) tests were performed on the composites reinforced with monoaxial rib knitted fabrics. The flexural properties, the peak force, the damage area and the energy absorption capabilities under drop weight impact loadings and the compression strength after impact of the composites were evaluated comparatively. The results indicated that the monoaxial rib knitted fabric reinforcement enhances the bending and CAI performances of the composites, but it causes detrimental effects on the impact performances of the composites. The use of yarn insertion for the enhancement of the composite performance necessitates considerate planning for an optimization between the in-plane and out-of-plane properties of the knitted fabric composites.

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