A systematic study of carbon fibre surface grafting via in situ diazonium generation for improved interfacial shear strength in epoxy matrix composites

2015 ◽  
Vol 118 ◽  
pp. 31-38 ◽  
Author(s):  
Kathleen M. Beggs ◽  
Linden Servinis ◽  
Thomas R. Gengenbach ◽  
Mickey G. Huson ◽  
Bronwyn L. Fox ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Systematic Study ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Fibre Surface ◽  
Interfacial Shear ◽  
Surface Grafting ◽  
Matrix Composites

scholarly journals A novel approach to functionalise pristine unsized carbon fibre using in situ generated diazonium species to enhance interfacial shear strength

2015 ◽  
Vol 3 (7) ◽  
pp. 3360-3371 ◽  
Author(s):  
L. Servinis ◽  
L. C. Henderson ◽  
L. M. Andrighetto ◽  
M. G. Huson ◽  
T. R. Gengenbach ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Novel Approach ◽  
Fibre Composites

An in situ diazonium grafting methodology was used to decorate the surface of carbon fibres with pendant amines. This methodology was shown to greatly affect IFSS in single fibre composites.

Size Effect on Microbond Testing Interfacial Shear Strength of Fiber-Reinforced Composites

2019 ◽  
Vol 86 (7) ◽  
Author(s):  
Qiyang Li ◽  
Guodong Nian ◽  
Weiming Tao ◽  
Shaoxing Qu
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Size Effect ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Experimental Results ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Material Systems

Microbond tests have been widely used for studying the interfacial mechanical properties of fiber-reinforced composites. However, experimental results reveal that the interfacial shear strength (IFSS) depends on the length of microdroplet-embedded fiber (le). Thus, it is essential to provide an insight into this size effect on IFSS. In this paper, microbond tests are conducted for two kinds of widely used composites, i.e., glass fiber/epoxy matrix and carbon fiber/epoxy matrix. The lengths of microdroplet-embedded glass fiber and carbon fiber are in the ranges from 114.29 µm to 557.14 µm and from 63.78 µm to 157.45 µm, respectively. We analyze the representative force–displacement curves, the processes of interfacial failure and frictional sliding, and the maximum force and the frictional force as functions of le. Experimental results show that IFSS of both material systems monotonically decreases with le and then approaches a constant value. The finite element model is used to analyze the size effect on IFSS and interfacial failure behaviors. For both material systems, IFSS predicted from simulations is consistent with that obtained from experiments. Moreover, by analyzing the shear stress distribution, a transition of interface debonding is found from more or less uniform separation to crack propagation when le increases. This study reveals the mechanism of size effect in microbond tests, serving as an effective method to evaluate the experimental results and is critical to guidelines for the design and optimization of advanced composites.

scholarly journals Hi-NicalonTM Fiber-Reinforced CVI-SiC Matrix Composites: II Interfacial Shear Strength and Its Effects on the Flexural Properties

2002 ◽  
Vol 43 (10) ◽  
pp. 2574-2577 ◽  
Author(s):  
Wen Yang ◽  
Hiroshi Araki ◽  
Akira Kohyama ◽  
Yutai Katoh ◽  
Quanli Hu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Flexural Properties ◽  
Matrix Composites ◽  
Fiber Reinforced

Direct measurement of fiber bridging in notched glass-ceramic-matrix composites

2006 ◽  
Vol 21 (5) ◽  
pp. 1150-1160 ◽  
Author(s):  
Konstantinos G. Dassios ◽  
Costas Galiotis
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Ceramic Matrix Composites ◽  
Interfacial Shear ◽  
Matrix Composites ◽  
Fiber Failure ◽  
Laser Raman ◽  
Notch Length ◽  
The Difference ◽  
Bridging Fibers

A novel, high-resolution remote Raman microscope was used for the direct in situ assessment of deformation on bridging fibers in a double-edge-notched SiC-Nicalon reinforced ceramic-glass matrix composite at various stages of monotonic tensile loading. The effect of notch length on the bridging strain profiles obtained by individually probing a large number of fibers across the bridged ligament of the composite was investigated. Bridging strain measurements in the microscale are used to identify the role and sequence of the failure micromechanisms developing within the bridging zone and are compared with their macromechanically derived counterparts. The difference of 25% in failure strain between the as-received fiber and the maximum value obtained on composite-fibers through laser Raman microscopy (LRM), is attributed to the different patterns of fiber failure in composites as compared to the techniques used for fibers characterization such as monofilament and bundle testing in air. This article demonstrates how the LRM-strain data can be utilized to obtain a direct, microscale measure of the interfacial-shear strength of the composite. The obtained interfacial shear strength (ISS) value of 7 MPa compares well with the macromechanically predicted value and offers a much higher precision compared to other experimental techniques.

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