scholarly journals Grafting Carbon Nanotubes on Glass Fiber by Dip Coating Technique to Enhance Tensile and Interfacial Shear Strength

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Bahador Dastorian Jamnani ◽  
Soraya Hosseini ◽  
Saeed Rahmanian ◽  
Suraya Abdul Rashid ◽  
Sa'ari b. Mustapha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glass Fiber ◽  
Interfacial Shear Stress ◽  
Interfacial Strength ◽  
Fiber Surface ◽  
Dip Coating ◽  
Interfacial Shear ◽  
Soaking Time ◽  
Pull Out ◽  
Two Parameters

The effects of noncovalent bonding and mechanical interlocking of carbon nanotubes (CNT) coating on tensile and interfacial strength of glass fiber were investigated. CNT were coated over glass fiber by a simple dip coating method. Acid treated CNT were suspended in isopropanol solution containing Nafion as binding agent. To achieve uniform distribution of CNT over the glass fiber, an optimized dispersion process was developed by two parameters: CNT concentration and soaking time. CNT concentration was varied from 0.4 to 2 mg/mL and soaking time was varied from 1 to 180 min. The provided micrographs demonstrated appropriate coating of CNT on glass fiber by use of CNT-Nafion mixture. The effects of CNT concentration and soaking time on coating layer were studied by performing single fiber tensile test and pull-out test. The obtained results showed that the optimum CNT concentration and soaking time were 1 mg/mL and 60 min, respectively, which led to significant improvement of tensile strength and interfacial shear stress. It was found that, at other concentrations and soaking times, CNT agglomeration or acutely curly tubes appeared over the fiber surface which caused a reduction of nanotubes interaction on the glass fiber.

Mechanical and thermal properties of polyoxymethylene-matrix composites filled with multi-walled carbon nanotubes-coated milled glass fiber

2019 ◽  
Vol 54 (15) ◽  
pp. 1961-1976
Author(s):  
Xu Xiangmin ◽  
Hongxiang Zhang ◽  
Tong Beibei ◽  
Li Binjie ◽  
Yudong Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Thermal Properties ◽  
Electron Microscope ◽  
Glass Fiber ◽  
Crystallization Temperature ◽  
High Performance ◽  
Multiwall Carbon Nanotubes ◽  
Fiber Surface ◽  
Mechanical And Thermal Properties

The advanced multifunctional filler has become one of the main challenges in developing high-performance polymer composites. In this study, the acid-treated multiwall carbon nanotubes (MWCNTs) were adhered to the surface of milled glass fiber under the combined effect of 3-aminopropyltriethyloxy silane and tetraethyl orthosilicate to fabricate a hierarchical fiber (MWCNTs-MGF). The morphologies of the hierarchical fibers were characterized using field-emission scanning electron microscope and transmission electron microscope, which showed evidence of a coating layer of MWCNTs on each fiber surface. The MWCNTs-MGF was employed as a multifunctional filler to prepare polyoxymethylene-based composites using a twin-screw extruder by melt blending. The obtained composites exhibited improved mechanical and thermal properties. The composite tensile strength and notched impact strength and Young's modulus increased by 10%, 32%, and 32%, respectively, as the MWCNTs-MGF content varies from 0 to 10 wt.%. Meanwhile, the reinforcing and toughing mechanisms of MWCNTs-MGF were also elaborated by analyzing the interfacial adhesion and fracture morphologies of the composites. Moreover, the study on thermal stability and crystallization behavior indicated that the polyoxymethylene/MWCNTs-MGF composites had higher thermal stability, crystallization temperature, and crystallinity as compared to the polymer matrix. The improvement of thermal stability originates from the unique surface structure of MWCNTs-MGF, while the increase in crystallization temperature and crystallinity is due to the strong heterogeneous nucleation ability of the hierarchical fibers.

Interfacial Shear Stress in Kenaf/Polyethylene Terephthalate Fiber Reinforced Polyoxymethylene Composite

2015 ◽  
Vol 786 ◽  
pp. 74-78
Author(s):  
Yakubu Dan-Mallam ◽  
M.S. Abdul Majid ◽  
Mohamad Zaki Abdullah
Keyword(s):  
Interfacial Shear Stress ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Interfacial Bonding ◽  
Test Method ◽  
Compression Moulding ◽  
Pull Out ◽  
Kenaf Fibre ◽  
The Matrix ◽  
Fibre Reinforced Polymer

The mechanical properties of fibre reinforced polymer composites strongly depend on the interfacial bonding between fibre and matrix. The main objective of this paper is to compare the interfacial bonding between kenaf fibre reinforced POM with that of PET fibre reinforced POM in a hybrid composite. Continuous twisted kenaf, and PET yarn were used for the investigation. Each fibre yarn was half embedded in POM by compression moulding. The yarns were extracted from the matrix by single fibre pull out test method. The result of the investigation revealed that the interfacial shear strength of approximately 31.4 MPa between kenaf and POM is higher compared to 24.3 MPa obtained between PET fibre and POM. This may be due to higher surface energy of kenaf fibre with respect to POM in the composite The FESEM micrograph further demonstrates good interfacial adhesion between kenaf and POM in the composite.

scholarly journals Bolt Pull-Out Tests of Anchorage Body under Different Loading Rates

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Tong-bin Zhao ◽  
Wei-yao Guo ◽  
Yan-chun Yin ◽  
Yun-liang Tan
Keyword(s):  
Shear Stress ◽  
Axial Force ◽  
Interfacial Shear Stress ◽  
Interfacial Shear ◽  
Interfacial Stress ◽  
Particle Flow Code ◽  
Mechanical Transmission ◽  
Loading Rates ◽  
Pull Out ◽  
Distribution Rule

Based on the force analysis and mechanical transmission mechanism of grouting bolts, the self-developed test apparatus for interfacial mechanics is used to study the distribution rule of axial force and interfacial stress of bolts in anchorage body. At the same time, pull-out tests of anchorage body are simulated with the particle flow code softwarePFC2D, and stress distribution and failure patters are researched under different loading rates. The results show that the distribution of axial force and interfacial shear stress is nonuniform along the anchorage section: axial force decreases, shear force increases first and then decreases, and the maximum value of both of them is closed to the pull-out side; with the increase of loading rates, both of axial force and interfacial shear stress show a trend of increase in the upper anchorage section but changes are not obvious in the lower anchorage section, which causes serious stress concentration; failure strength of pull-out and loading rates show a linear correlation; according to loading rates’ impact on the anchoring effect, the loading rates’ scope can be divided into soft scope (v<10 mm/s), moderate scope (10 mm/s <v< 100 mm/s), and strong scope (v>100 mm/s).

scholarly journals A Finite Element Investigation into the Cohesive Properties of Glass-Fiber-Reinforced Polymers with Nanostructured Interphases

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2487
Author(s):  
Mohammad J. Ghasemi Parizi ◽  
Hossein Shahverdi ◽  
Ehsan Pipelzadeh ◽  
Andreu Cabot ◽  
Pablo Guardia
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Glass Fiber ◽  
Interfacial Shear Stress ◽  
Fiber Reinforced Polymers ◽  
Fe Model ◽  
Fiber Reinforced ◽  
Gfrp Composites ◽  
Pull Out ◽  
Glass Fiber Reinforced

Glass-fiber-reinforced polymer (GFRP) composites represent one of the most exploited composites due to their outstanding mechanical properties, light weight and ease of manufacture. However, one of the main limitations of GFRP composites is their weak inter-laminar properties. This leads to resin delamination and loss of mechanical properties. Here, a model based on finite element analysis (FEA) is introduced to predict the collective advantage that a GF surface modification has on the inter-laminar properties in GFRP composites. The developed model is validated with experimental pull-out tests performed on different samples. As such, modifications were introduced using different surface coatings. Interfacial shear stress (IFSS) for each sample as a function of the GF to polymer interphase was evaluated. Adhesion energy was found by assimilating the collected data into the model. The FE model reported here is a time-efficient and low-cost tool for the precise design of novel filler interphases in GFRP composites. This enables the further development of novel composites addressing delamination issues and the extension of their use in novel applications.

scholarly journals Surface roughness characterization of various ceramic fibers using AFM and low-voltage SEM

1994 ◽  
Vol 52 ◽  
pp. 1066-1067
Author(s):  
K. L. More ◽  
E. Lara-Curzio ◽  
R. A. Lowden
Keyword(s):  
Surface Roughness ◽  
Low Voltage ◽  
Interfacial Shear Stress ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Matrix Interface ◽  
Ceramic Fibers ◽  
Pull Out ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

The effect of interfacial properties in fiber-reinforced ceramic matrix composites is critical to the overall mechanical behavior of the composite material. The creation of a relatively weak fiber/matrix interface allows for the beneficial actions of debonding and fiber pull-out to occur, thus improving the fracture toughness and, in many cases, the ultimate strength of the composite. To date, the best room temperature interfacial properties have been achieved by coating the fibers with either carbon or boron nitride. There are several factors which contribute to the interfacial properties of a composite, including the residual stress (clamping stress) present at the fiber/matrix interface, which is a result of differences in thermal expansion, and the fiber surface roughness. In this study, the surfaces of several ceramic fibers have been characterized qualitatively using a Hitachi S-4500 FEG SEM operated at low voltages and quantitatively using a Topometrix atomic force microscope (AFM). This study is part of an overall program relating fiber surface roughness to the interfacial shear stress.

scholarly journals Epoxy/Glass Fiber Nanostructured p- and n-Type Thermoelectric Enabled Model Composite Interphases

2020 ◽  
Vol 10 (15) ◽  
pp. 5352
Author(s):  
George Karalis ◽  
Kyriaki Tsirka ◽  
Lazaros Tzounis ◽  
Christos Mytafides ◽  
Lampros Koutsotolis ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Power Factor ◽  
Glass Fibers ◽  
Interfacial Shear Stress ◽  
Resin Matrix ◽  
Single Wall Carbon Nanotubes ◽  
Single Pair ◽  
Model Composite ◽  
Coated Glass ◽  
Pull Out

This experimental study is associated with the modification of glass fibers with efficient, organic, functional, thermoelectrically enabled coatings. The thermoelectric (TE) behavior of the coated glass fiber tows with either inherent p semiconductor type single wall carbon nanotubes (SWCNTs) or the n-type molecular doped SWCNTs were examined within epoxy resin matrix in detail. The corresponding morphological, thermogravimetric, spectroscopic, and thermoelectric measurements were assessed in order to characterize the produced functional interphases. For the p-type model composites, the Seebeck coefficient was +16.2 μV/K which corresponds to a power factor of 0.02 μW/m∙K2 and for the n-type −28.4 μV/K which corresponds to power factor of 0.12 μW/m∙K2. The p–n junction between the model composites allowed for the fabrication of a single pair thermoelectric element generator (TEG) demonstrator. Furthermore, the stress transfer at the interphase of the coated glass fibers was studied by tow pull-out tests. The reference glass fiber tows presented the highest interfacial shear stress (IFSS) of 42.8 MPa in comparison to the p- and n-type SWCNT coated GF model composites that exhibited reduced IFSS values by 10.1% and 28.1%, respectively.

scholarly journals Characteristics of Interfacial Shear Bonding Between Basalt Fiber and Mortar Matrix

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5037
Author(s):  
Li Hong ◽  
Tadan Li ◽  
Yadi Chen ◽  
Peng Gao ◽  
Lizhi Sun
Keyword(s):  
Glass Fiber ◽  
Bonding Strength ◽  
Basalt Fiber ◽  
Interfacial Shear ◽  
Basalt Fibers ◽  
Pull Out ◽  
Comparison Results ◽  
Pva Fiber ◽  
Shear Bonding Strength ◽  
Mortar Matrix

Basalt fibers have been adopted as reinforcements to improve mechanical performance of concrete materials and structures due to their excellent corrosion resistance, affordable cost, and environmental-friendly nature. While the reinforcing efficiency is significantly dependent on fiber–matrix interfacial properties, there is a lack of studies focusing on the bonding behavior of basalt fibers in the mortar matrix. In this paper, a series of experiments were carried out to investigate the characteristics of single basalt fiber pulled out from the mortar matrix. Three embedment lengths and three types of mortar strength were considered. As references, the pull-out behavior of single polyvinyl alcohol (PVA) fiber and glass fiber in mortar matrix were also tested for comparison. Results from the pull-out test revealed that the average bonding strength is more effective than the equivalent shear bonding strength to illustrate the interfacial bond behavior of single basalt fiber in mortar matrix, which can be improved by either longer embedment length or the stronger mortar matrix. Finally, the tensile and compressive strengths of basalt/PVA/glass fiber-reinforced concrete (FRC) were measured to investigate the influence of interfacial shear bonding strengths. It was shown that, while PVA fiber developed the highest shear bonding strength with mortar, the basalt fiber exhibited the best reinforcing efficiency of FRC.

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