Effect of carbon nanotubes on the interfacial shear strength of T650 carbon fiber in an epoxy matrix

2009 ◽  
Vol 69 (7-8) ◽  
pp. 898-904 ◽  
Author(s):  
R.J. Sager ◽  
P.J. Klein ◽  
D.C. Lagoudas ◽  
Q. Zhang ◽  
J. Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shear Strength ◽  
Carbon Fiber ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Interfacial Shear

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 Advanced Models for Modulus and Strength of Carbon-Nanotube-Filled Polymer Systems Assuming the Networks of Carbon Nanotubes and Interphase Section

Mathematics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 990
Author(s):  
Yasser Zare ◽  
Kyongyop Rhee
Keyword(s):  
Carbon Nanotubes ◽  
Shear Strength ◽  
Carbon Nanotube ◽  
Interfacial Shear Strength ◽  
Tensile Modulus ◽  
Interfacial Shear ◽  
Filled Polymer ◽  
Polymer Systems

This study focuses on the simultaneous stiffening and percolating characteristics of the interphase section in polymer carbon nanotubes (CNTs) systems (PCNTs) using two advanced models of tensile modulus and strength. The interphase, as a third part around the nanoparticles, influences the mechanical features of such systems. The forecasts agree well with the tentative results, thus validating the advanced models. A CNT radius of >40 nm and CNT length of <5 μm marginally improve the modulus by 70%, while the highest modulus development of 350% is achieved with the thinnest nanoparticles. Furthermore, the highest improvement in nanocomposite’s strength (350%) is achieved with the CNT length of 12 μm and interfacial shear strength of 8 MPa. Generally, the highest ranges of the CNT length, interphase thickness, interphase modulus and interfacial shear strength lead to the most desirable mechanical features.

Effect of Water Temperature on Interfacial Shear Strength of Resin Particles Added CFRTP

2018 ◽  
Vol 774 ◽  
pp. 7-12
Author(s):  
Hideaki Katogi ◽  
Kenichi Takemura ◽  
Mao Mochizuki
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Water Temperature ◽  
Room Temperature ◽  
Interfacial Shear Strength ◽  
Water Immersion ◽  
Interfacial Shear ◽  
Water Penetration ◽  
Resin Particle ◽  
Particle Addition

In this study, interfacial shear strength of resin particles added carbon fiber/maleic acid anhydride grafted polypropylene under water temperature was investigated. Water temperature range was from room temperature to 80 oC. The maximum immersion time was 24 hours. Micro debonding tests of non and resin particles added composites were conducted. Fracture surface of resin particles added composite were observed by Scanning Electron Microscope (SEM). As a result, interfacial shear strengths of non particles added composite monotonously decreased with an increase of water temperature. Interfacial shear strength of resin particles added composite was higher than that of non resin particles added composite under all water temperatures except for 50 oC. From SEM observation, large resin particles on surface of carbon fiber after water immersion at 50 oC were found. And, many matrices and large resin particles on surface of carbon fiber after water immersion at 80 oC were found. Therefore, interfacial shear strength of composite was improved because resin particle addition prevented water penetration into the interface between fiber and matrix under water immersion less than 50 oC. And, interfacial shear strength of composite was probably improved by anchor effect of resin particle under water immersion at 80 oC.

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