Grafting Low Contents of Branched Polyethylenimine onto Carbon Fibers to Effectively Improve Their Interfacial Shear Strength with an Epoxy Matrix

2015 ◽  
Vol 2 (12) ◽  
pp. 1500122 ◽  
Author(s):  
Xiu-Zhi Tang ◽  
Bin Yu ◽  
Reinack Varghese Hansen ◽  
Xuelong Chen ◽  
Xiao Hu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fibers ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Branched Polyethylenimine

scholarly journals Effect of nanoclay (Kaolinite) on mechanical properties of epoxy-fiber composite

2020 ◽  
Vol 12 (01) ◽  
pp. 38-43
Author(s):  
Hisham M Hasan ◽  
◽  
Ahmed R Majeed ◽  
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Shear Strength ◽  
Tensile Test ◽  
Carbon Fibers ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Fiber Composite ◽  
Weight Fraction ◽  
Interfacial Shear

An experimental investigation using drag-out tensile test to calculate the interfacial shear strength for different embedded lengths of Kevlar and carbon fibers reinforced epoxy matrix with nanoclay (kaolinite) for different ratio weight, the interfacial shear strength increased by with increasing of embedded length and ratio weight fraction of nanoclay that adding to epoxy matrix.

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.

SYNERGISTIC EFFECTS OF PLASMA POLYMERIZATION AND COVALENT SURFACE MODIFICATION OF CARBON FIBERS

2021 ◽  
Author(s):  
DANIEL J. EYCKENS ◽  
LACHLAN SOULSBY ◽  
FILIP STOJCEVSKI ◽  
ATHULYA WICKRAMASINGHA ◽  
LUKE C. HENDERSON
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Surface Modification ◽  
Carbon Fibers ◽  
Plasma Polymerization ◽  
Interfacial Shear Strength ◽  
Synergistic Effects ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Electrochemical Pretreatment

This work demonstrates the efficacy in performing an electrochemical pretreatment on carbon fibres to improve the effect of plasma polymerization of acrylic acid on these surfaces. Modified samples demonstrated improve physical properties including tensile strength and Young’s modulus, as well as an increase in composite performance as measured by the interfacial shear strength. The electrochemical pretreatment was shown to enhance the advantages observed when coating fibres using plasma polymerization.

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