scholarly journals Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2006
Author(s):  
Nicola Zavatta ◽  
Francesco Rondina ◽  
Maria Pia Falaschetti ◽  
Lorenzo Donati
Keyword(s):  
Carbon Fibre ◽  
Thermal Ageing ◽  
Epoxy Composites ◽  
Short Exposure ◽  
Artificial Ageing ◽  
Carbon Fabric ◽  
Beam Shear ◽  
Maximum Decrease ◽  
Different Temperatures ◽  
Interlaminar Shear

Applications of Carbon Fibre Reinforced Polymers (CFRP) at temperatures over 150–200 °C are becoming common in aerospace and automotive applications. Exposure of CFRP to these temperatures can lead to permanent changes in their mechanical properties. In this work, we investigated the effect of thermal ageing in air on the strength of carbon fabric/epoxy composites. To this end, accelerated artificial ageing at different temperatures was performed on carbon fabric/epoxy specimens. The flexural and interlaminar shear strengths of the aged specimens were assessed by three-point bending and short beam shear tests, respectively, and compared to those of unaged samples. For ageing at temperatures below the glass transition temperature of the resin, Tg, a moderate reduction of strength was found, with a maximum decrease of 25% for 2160 h at 75% Tg. On the other hand, a rapid strength decrease was observed for ageing temperatures above Tg. This was attributed to degradation of the epoxy matrix and of the fibre/epoxy interface. In particular, a 30% strength decrease was found for less than 6 h at 145% Tg. Therefore, it was concluded that even a short exposure to operating temperatures above Tg could substantially impair the load-carrying capability of CFRP components.

Thermo-Mechanical and ILSS Properties of Woven Carbon/Epoxy-XD-CNT Nanophased Composites

2014 ◽  
Vol 1700 ◽  
pp. 55-60
Author(s):  
Mohammad K. Hossain ◽  
Md Mahmudur R. Chowdhury ◽  
Mahmud B. Salam ◽  
Johnathan Malone ◽  
Mahesh V. Hosur ◽  
...  
Keyword(s):  
High Speed ◽  
Loss Modulus ◽  
Compression Molding ◽  
Epoxy Composites ◽  
Molding Process ◽  
Short Beam ◽  
Uniform Dispersion ◽  
Beam Shear ◽  
Interlaminar Shear ◽  
Modified Resin

ABSTRACTCarbon fiber-reinforced epoxy composites (CFEC) were fabricated infusing 0, 0.15, 0.30, and 0.40 wt% amino-functionalized XD-grade carbon nanotubes (NH2-XDCNTs) using the compression molding process under 16 kips. The thermo-mechanical and interlaminar shear properties of CNT incorporated carbon/epoxy composite samples were evaluated by performing dynamic-mechanical thermal analysis (DMTA) and short beam shear (SBS) tests. XD-CNTs were infused into Epon 862 resin using a mechanical stirrer followed by a high intensity ultrasonic liquid processor for better dispersion. After the sonication, the mixture was placed in a three roll milling processor for 3 successive cycles at 140 rpm, with the gap spaces incrementally reduced from 20 to 5 μm, to obtain the uniform dispersion of CNTs throughout the resin. Epikure W curing agent was then added to the modified resin and mixed using a high-speed mechanical stirrer. Finally, the fiber was reinforced with that modified resin using the compression molding process. The results obtained from the DMTA test were analyzed based on the storage modulus, glass transition temperature, and loss modulus. The analysis indicated that the thermo-mechanical properties were linearly increasing from 0 to 0.3 wt% XDCNT loading. The SBS test results exhibited that the incorporation of XDCNTs into the composite increased the interlaminar shear strength (ILSS) by up to 22% at 0.3 wt% CNT loading. Better dispersion of XDCNTs might be attributed to more crosslinking sites and better interaction between fiber and matrix resulting in an improved fiber-matrix interface, whereas, the reaction between functional groups –NH2 of XDCNTs with epoxide groups of resin and epoxy silanes of fiber surfaces improved the crosslinking and thereby ILSS properties of carbon/epoxy composites.

scholarly journals The reinforcing effect of oriented graphene on the interlaminar shear strength of carbon fabric/epoxy composites

2020 ◽  
Vol 185 ◽  
pp. 108257 ◽  
Author(s):  
Xiao-Jun Shen ◽  
Chen-Yang Dang ◽  
Bo-Lin Tang ◽  
Xiao-Hui Yang ◽  
Hui-Jie Nie ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Carbon Fabric ◽  
Reinforcing Effect ◽  
Interlaminar Shear

Investigation on cryogenic interlaminar shear properties of carbon fabric/epoxy composites improved by graphene oxide-coated glass fibers

2020 ◽  
Vol 22 ◽  
pp. 100510
Author(s):  
Chen-Yang Dang ◽  
Kun Liu ◽  
Meng-Xuan Fan ◽  
Song-Qing Zhu ◽  
Shuang-Hui Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Glass Fibers ◽  
Epoxy Composites ◽  
Carbon Fabric ◽  
Shear Properties ◽  
Coated Glass ◽  
Interlaminar Shear

scholarly journals Effect of Sizing Agents on Surface Properties of T800 Grade CF and Thermal Aging Time on Mechanical Properties of T800 Grade CF/Epoxy Composites

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Tian Yang ◽  
Yan Zhao ◽  
Hansong Liu ◽  
Shu Xiong
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Aging Time ◽  
Surface Properties ◽  
Thermal Aging ◽  
Ageing Time ◽  
Flexural Modulus ◽  
Thermal Ageing ◽  
Epoxy Composites ◽  
Interlaminar Shear

This paper investigates the effect of sizing agent molecular weight on carbon fiber (CF) surface properties and the effect of thermal aging time on mechanical properties of CF/epoxy composites. The surface properties of three CCF800 CF samples with varying sizing agent molecular weight were characterized by surface morphology, surface roughness, chemical functional groups, and element composition. The results showed that the sample with low molecular weight exhibited low roughness and high proportion of activated carbon atoms. The flexural strength, flexural modulus, and interlaminar shear strength of CCF800/5228 composites were measured at 25°C and 150°C by thermal ageing time 0, 100 h, 250 h, 500 h, and 1000 h. The results showed that the thermal aging time up to 1000 h had little effect on the flexural modulus, and the interlaminar shear performance at 150°C showed a trend of increasing at the beginning and then decreasing.

Surface and Composite Interface of Carbon Fiber Modified by Grafting of Diethanolamine

2009 ◽  
Vol 79-82 ◽  
pp. 497-500 ◽  
Author(s):  
Lei Chen ◽  
Zhi Wei Xu ◽  
Jia Lu Li ◽  
Xiao Qing Wu ◽  
Li Chen
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Functional Groups ◽  
Carbon Fibers ◽  
Irradiation Dose ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Composite Interface ◽  
Γ Ray ◽  
Interlaminar Shear

The γ-ray co-irradiation method was employed to study the effect of diethanolamine modification on the surface of carbon fiber (CF) and the interfacial properties of CF/epoxy composites. Compared with the original carbon fiber, the surface of modified fibers became rougher. The amount of oxygen-containing functional groups was increased and the nitrogen element was detected after irradiation grafting. The interlaminar shear strength (ILSS) of composites reinforced by carbon fibers irradiated in diethanolamine solution was increased and then decreased as the irradiation dose increased. The ILSS of CF/epoxy composites was enhanced by 16.1% at 200kGy dose, compared with that of untreated one. The γ-ray irradiation grafting is expected to be a promising method for the industrialized modification of carbon fibers.

Sign in / Sign up

Export Citation Format

Share Document