scholarly journals The Impact of Carbon Nanofibres on the Interfacial Properties of CFRPs Produced with Sized Carbon Fibres

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3457
Author(s):  
Zhenxue Zhang ◽  
Xiaoying Li ◽  
Simon Jestin ◽  
Stefania Termine ◽  
Aikaterini-Flora Trompeta ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Fibre Diameter ◽  
Sheet Thickness ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Nanoindentation Test ◽  
Carbon Nanofibres ◽  
The Impact ◽  
Push Out

In this work, different amounts of CNFs were added into a complex formulation to coat the CFs surfaces via sizing in order to enhance the bonding between the fibre and the resin in the CF-reinforced polymer composites. The sized CFs bundles were characterised by SEM and Raman. The nanomechanical properties of the composite materials produced were assessed by the nanoindentation test. The interfacial properties of the fibre and resin were evaluated by a push-out method developed on nanoindentation. The average interfacial shear strength of the fibre/matrix interface could be calculated by the critical load, sheet thickness and fibre diameter. The contact angle measurements and resin spreadability were performed prior to nanoindentation to investigate the wetting properties of the fibre. After the push-out tests, the characterisation via optical microscopy/SEM was carried out to ratify the results. It was found the CFs sizing with CNFs (1 to 10 wt%) could generally increase the interfacial shear strength but it was more cost-effective with a small amount of evenly distributed CNFs on CFs.

scholarly journals Comparison of push-in and push-out tests for measuring interfacial shear strength in nano-reinforced composite materials

2015 ◽  
Vol 50 (12) ◽  
pp. 1651-1659 ◽  
Author(s):  
Carlos Medina M ◽  
Jon M Molina-Aldareguía ◽  
Carlos González ◽  
Manuel F Melendrez ◽  
Paulo Flores ◽  
...  
Keyword(s):  
Shear Strength ◽  
Composite Materials ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Reinforced Composite ◽  
Push Out

Processing and mechanical behavior of SiC fiber-reinforced Si3N4 composites

1991 ◽  
Vol 6 (9) ◽  
pp. 1926-1936 ◽  
Author(s):  
J-M. Yang ◽  
Steven T.J. Chen ◽  
S.M. Jeng ◽  
R.B. Thayer ◽  
J-F. LeCoustaouec
Keyword(s):  
Shear Strength ◽  
Mechanical Behavior ◽  
Interfacial Shear Strength ◽  
Indentation Test ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Bending Test ◽  
Frictional Stress ◽  
Propagation Behavior ◽  
Sic Fiber

The interfacial properties and mechanical behavior of the SCS-6/Si3N4 composites fabricated by hot pressing from powder lay-up and tape lay-up techniques were studied. Interfacial shear strength and frictional stress were measured using an indentation test. Fracture toughness and work-of-fracture were measured using a three-point bending test on a chevron-notched specimen. The influence of interfacial shear strength on the toughening mechanisms and crack propagation behavior were investigated. The results indicate that the processing routes and fiber orientation will affect the interfacial properties, which in turn have a significant influence on mechanical properties.

Study on 2-D Multi-Fiber Arrange Model Composites

2005 ◽  
Vol 297-300 ◽  
pp. 219-224
Author(s):  
Chang Kwon Moon ◽  
Ki Woo Nam
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Interfacial Shear Strength ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Two Dimensional ◽  
Fragmentation Test ◽  
Fiber Fragmentation ◽  
Fiber Surface Treatment

The effect of interfiber distance on the interfacial properties in two dimensional multi-Eglass fiber/epoxy resin composites has been investigated using fragmentation test. In additions, the effect of the fiber surface treatment on the interfacial properties has been studied. We found that the interfacial shear strength decreased with the decreasing of the interfiber distance at the range of under 50µm and the extent of the decreasing was more serious as the increasing of the number of adjacent fiber. This is probably that the interface between the fiber and the resin was damaged by the adjacent fiber breaks and the damage increased with closing the interfiber spacing and the number of adjacent fiber. We can guess from this interfacial shear strength in real composites is much smaller than that of multi-fiber fragmentation sample with touched fiber. It was seen that the interfacial shear strengths saturated when the interfiber distance was over 50µm, the ones were saturated regardless of fiber surface treatment and the ones were in close agreement with those of the single fiber fragmentation test. Finally, the interfacial shear strength evaluated using two dimensional fragmentation tests are shown as real values in-site regardless of fiber surface treatment, interfiber distance and existing of matrix cracks.

Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system

2017 ◽  
Vol 52 (16) ◽  
pp. 2163-2177 ◽  
Author(s):  
Q Zhao ◽  
CC Qian ◽  
LT Harper ◽  
NA Warrior
Keyword(s):  
Finite Element ◽  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Fibre Diameter ◽  
Radial Distance ◽  
Interfacial Shear ◽  
Epoxy System ◽  
Droplet Shape ◽  
Fibre Breakage

A 3D finite element model has been developed to identify the main causes of variability in the microdroplet test, which is commonly used to characterise the interfacial shear strength between polymer matrices and single filaments. A more realistic droplet shape and test configuration, including meniscus details and prismatic shear blades, have been modelled for a carbon fibre/epoxy system to simulate a more representative set up than is commonly used in the literature. The interfacial behaviour has been modelled using a cohesive surface contact and fibre breakage has been captured using a maximum stress criterion. A statistical study has been performed to systematically evaluate the influence of key geometrical test parameters on the variability in the measured interfacial shear strength values and the likelihood of fibre breakage. Parameters studied are fibre embedded length, fibre diameter, shear blade radial opening distance and shear blade axial misalignment.  Results of the studied carbon fibre /epoxy system suggest that fibre embedded length and the combined effects of the shear blade radial distance and the shear blade axial misalignment are the most significant sources of variability for the measured interfacial shear strength. However, fibre embedded length and the shear blade radial distance are the most significant variables contributing to fibre breakage.

scholarly journals Investigation on the interfacial properties of CNTs sized carbon fibres in epoxy resin using push-out method via nano-indentation technique

2021 ◽  
Vol 349 ◽  
pp. 01007
Author(s):  
Zhenxue Zhang ◽  
Xiaoying Li ◽  
Hanshan Dong ◽  
Simon Jestin ◽  
Stefania Termine ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Indentation Creep ◽  
Indentation Hardness ◽  
Carbon Fibres ◽  
Complex Formulation ◽  
Reduced Modulus ◽  
Push Out ◽  
Fibre Matrix

In this work, the carbon fibres (CFs) surfaces were modified via sizing and coated with a very thin layer of a complex formulation including carbon nanotubes (CNTs). A push-out method was developed based on nanoindentation to assess the interfacial shear strength of the fibre/matrix. The mechanical properties such as indentation hardness, reduced modulus, indentation displacement and indentation creep of the composite were evaluated by means of the Oliver-Pharr method. The critical load of different composites was measured and the interfacial shear strength (IFSS) was calculated to compare the effect of the CNTs concentration in the sizing solution. Wettability evaluation of the sized fibres was performed prior to nanoindentation to investigate the adhesion of the resin. After push-out testing, characterisation by optical microscopy/SEM was carried out to ratify the results. It was found sizing with a small amount of evenly distributed nano-inclusion on CFs can increase the interfacial shear strength but large amount of sizing could lead to a decrease of the interfacial bonding due to the agglomeration of CNTs on CFs.

Revision of Cemented Fixation and Cement—Bone Interface Strength

1992 ◽  
Vol 206 (1) ◽  
pp. 47-49 ◽  
Author(s):  
A Rosenstein ◽  
W MacDonald ◽  
A Iliadis ◽  
P McLardy-Smith
Keyword(s):  
Shear Strength ◽  
Bone Cement ◽  
Interfacial Shear Strength ◽  
Interface Strength ◽  
Interfacial Shear ◽  
Bone Fixation ◽  
Pmma Bone Cement ◽  
Joint Arthroplasties ◽  
Pmma Cement ◽  
Push Out

Interfacial shear strength between poly(methyl methacrylate) (PMMA) bone cement and cancellous bone was measured in bone samples from human proximal femora. Samples were prepared with fresh cement-bone, fresh cement inside a mantle of existing cement and with fresh cement-revised bone surfaces. Push-out tests to measure shear strength caused failure only at bone-cement interfaces; revised bone interfaces were 30 per cent weaker (P < 0.02) than primary interfaces. The clinical relevance is that revision of cemented joint arthroplasties may necessitate removal of components with sound cement-bone fixation. The practice of removing all traces of PMMA cement may not yield the optimal fixation; adhesion of fresh cement to freshly prepared surfaces of the existing cement might also be considered where circumstances are favourable.

Improved interfacial shear strength of carbon fiber/polyphenylene sulfide composites by graphene

2016 ◽  
Vol 29 (8) ◽  
pp. 913-921 ◽  
Author(s):  
Junyi Xu ◽  
Dongxia Xu ◽  
Xiaojun Wang ◽  
Shengru Long ◽  
Jie Yang
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Interfacial Shear Strength ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Polyphenylene Sulfide ◽  
Mechanical Interlocking ◽  
Reinforced Plastic ◽  
Microbond Test ◽  
Micrometer Size

By taking advantage of the micrometer size dimensions and excellent mechanical properties along with the large specific surface area of graphene (GN) sheet, we developed a simple and effective strategy to improve the interfacial properties of carbon fiber (CF)-reinforced plastic. Different contents of GN dispersed in the agent were introduced onto the surface of CF to prepare the CF-GN/polyphenylene sulfide composites. The surface topography and the distribution of GN sheets on the surface of CF were detected by scanning electron microscopy. It was found that the introduction of GN significantly increased the surface roughness of CF, which was beneficial to enhance mechanical interlocking between the fiber and matrix. The microbond test showed that there was the most appropriate GN content, at which the composites exhibited the highest interfacial shear strength (IFSS). An improvement of 20% from 55.2 MPa to 66.2 MPa in IFSS confirmed the remarkable improvement in the interfacial properties of the composites when only 0.5 wt% of GN sheets was introduced in the agent sizing.

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