Modification of the Interface in Carbon Nanotube-Grafted T-Glass Fiber

2012 ◽  
Author(s):  
H. Kawada ◽  
S. Sato ◽  
M. Kameya
Keyword(s):  
Shear Strength ◽  
Epoxy Resin ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Chemical Vapor ◽  
Interfacial Shear ◽  
Interfacial Region ◽  
Shear Lag ◽  
Reinforced Plastics ◽  
Elastic Shear

In recent years, carbon nanotubes (CNTs) have attracted a lot of interest as an additional component in fiber reinforced plastics (FRP) to improve the properties of the fiber/matrix interface. An improvement of the apparent interfacial shear strength (ISS) was achieved by grafting CNTs onto reinforcement fibers instead of dispersing CNTs in the matrix. In one study, composites containing CNT-grafted fibers and epoxy resin demonstrated 26% ISS improvement over the baseline composites. However, few studies are focused on glass fibers, due to their low heat resistance. In this study, the effects of grafting CNTs onto T-glass fibers were evaluated by investigating the mechanical and interfacial properties of the CNT-grafted fiber/epoxy resin model composites. Elastic shear-lag analysis was also used to investigate the effect of CNTs on ISS. We used the chemical vapor deposition (CVD) method to graft CNTs onto T-glass fibers. As a result, CNTs were grafted relatively uniformly and cylindrically onto the fibers, which indicates that the CNT-grafting process was appropriate. The CNT-grafted fiber/epoxy resin model composites showed a significant (46∼67%) increase of interfacial shear strength. The formation of an interfacial region containing CNTs was observed around each fiber. Elastic shear-lag analysis showed a 20% increase of ISS. Those results imply that the elastic modulus of the interfacial region around the fibers was higher than that of epoxy resin.

scholarly journals Enhanced Interfacial Shear Strength and Critical Energy Release Rate in Single Glass Fiber-Crosslinked Polypropylene Model Microcomposites

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2552 ◽  
Author(s):  
Uwe Gohs ◽  
Michael Mueller ◽  
Carsten Zschech ◽  
Serge Zhandarov
Keyword(s):  
Shear Strength ◽  
Electron Beam ◽  
Energy Release Rate ◽  
Glass Fiber ◽  
Release Rate ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Critical Energy ◽  
Interfacial Shear ◽  
Critical Energy Release Rate

Continuous glass fiber-reinforced polypropylene composites produced by using hybrid yarns show reduced fiber-to-matrix adhesion in comparison to their thermosetting counterparts. Their consolidation involves no curing, and the chemical reactions are limited to the glass fiber surface, the silane coupling agent, and the maleic anhydride-grafted polypropylene. This paper investigates the impact of electron beam crosslinkable toughened polypropylene, alkylene-functionalized single glass fibers, and electron-induced grafting and crosslinking on the local interfacial shear strength and critical energy release rate in single glass fiber polypropylene model microcomposites. A systematic comparison of non-, amino-, alkyl-, and alkylene-functionalized single fibers in virgin, crosslinkable toughened and electron beam crosslinked toughened polypropylene was done in order to study their influence on the local interfacial strength parameters. In comparison to amino-functionalized single glass fibers in polypropylene/maleic anhydride-grafted polypropylene, an enhanced local interfacial shear strength (+20%) and critical energy release rate (+80%) were observed for alkylene-functionalized single glass fibers in electron beam crosslinked toughened polypropylene.

scholarly journals Experimental and Numerical Study of the Interfacial Shear Strength in Carbon Fiber/Epoxy Resin Composite under Thermal Loads

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Hongxiao Wang ◽  
Xiaohui Zhang ◽  
Yugang Duan ◽  
Lingjie Meng
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Epoxy Resin ◽  
Interfacial Shear Strength ◽  
Numerical Study ◽  
Resin Composite ◽  
Interfacial Shear ◽  
Thermal Loads ◽  
Mechanical Coupling ◽  
Pull Out

This study examined the influence mechanism of temperature on the interfacial shear strength (IFSS) between carbon fiber (CF) and epoxy resin (EP) matrices under various thermal loads using experimental and numerical simulation methods. To evaluate the change in IFSS as a function of the increase in temperature, a microbond test was performed under controlled temperature environment from 23°C to 150°C. The experimental results showed that IFSS values of CF/EP reduce significantly when the temperature reaches near glass transition temperature. To interpret the effect of thermal loads on IFSS, a thermal-mechanical coupling finite element model was used to simulate the process of fiber pull-out from EP. The results revealed that temperature dependence of IFSS is linked to modulus of the matrix as well as to the coefficients of thermal expansion of the fiber and matrix.

scholarly journals Analysis of the Interfacial Adhesion between a Stainless-Steel Fiber and an Epoxy Resin by the Single Fiber Microdroplet Test

Surfaces ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 594-604
Author(s):  
MiYeon Kwon ◽  
Seung Goo Lee
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Acid Treatment ◽  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Steel Fiber ◽  
Interfacial Shear ◽  
Steel Fibers ◽  
Stainless Steel Fiber

In this study, the surfaces of the stainless-steel fibers of the kind primarily utilized in fiber-reinforced composite materials were modified by an acid treatment to increase the interfacial adhesion between the fibers and epoxy resins in composite materials. The interfacial shear strength between the resins and acid-treated fibers was determined by a single fiber microdroplet test, where the resin droplet was located at the center of the fiber. The etching effect at the surface of the fibers increased with the increase in the acid-treatment time. The interfacial shear strength between the stainless-steel fiber and epoxy resin increased with the increase in the specific surface area of contact between the fiber and resin. Furthermore, there was no significant deterioration in the mechanical properties of the stainless-steel fibers with the increase in the surface etching effect. The modification of the surfaces of the stainless-steel fibers by the acid treatment resulted in an increase in the interfacial shear strength between the fibers and resins. Thus, this study demonstrated the possibility of widening the scope of the applications of stainless-steel fiber/epoxy resin composites.

scholarly journals Effect of Tow Size and Interface Interaction on Interfacial Shear Strength Determined by Iosipescu (V-Notch) Testing in Epoxy Resin

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1786 ◽  
Author(s):  
Filip Stojceveski ◽  
Andreas Hendlmeier ◽  
James D. Randall ◽  
Chantelle L. Arnold ◽  
Melissa K. Stanfield ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Epoxy Resin ◽  
Failure Modes ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Single Filament ◽  
Time Investment ◽  
Beam Shear ◽  
Surface Modified

Testing methodologies to accurately quantify interfacial shear strength (IFSS) are essential in order to understand fiber-matrix adhesion. While testing methods at a microscale (single filament fragmentation test—SFFT) and macroscale (Short Beam Shear—SBS) are wide spread, each have their own shortcomings. The Iosipescu (V-notch) tow test offers a mesoscale bridge between the microscale and macroscale whilst providing simple, accurate results with minimal time investment. However, the lack of investigations exploring testing variables has limited the application of Iosipescu testing to only a handful of studies. This paper assesses the effect of carbon fiber tow size within the Iosipescu tow test for epoxy resin. Tow sizes of 3, 6, and 9 k are eminently suitable, while more caution must be shown when examining 12, and 15 k tows. In this work, tows at 18 and 24 k demonstrated failure modes not derived from interfacial failure, but poor fiber wetting. A catalogue of common fracture geometries is discussed as a function of performance for the benefit of future researchers. Finally, a comparison of commercial (T300), amine (T300-Amine), and ethyl ester (T300-Ester) surface modified carbon fibers was conducted. The outcomes of this study showed that the Iosipescu tow test is inherently less sensitive in distinguishing between similar IFSS but provides a more ‘real world’ image of the carbon fiber-epoxy interface in a composite material.

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