Carbon nanotube-reinforced epoxy-composites: enhanced stiffness and fracture toughness at low nanotube content

2004 ◽  
Vol 64 (15) ◽  
pp. 2363-2371 ◽  
Author(s):  
F.H. Gojny ◽  
M.H.G. Wichmann ◽  
U. Köpke ◽  
B. Fiedler ◽  
K. Schulte
Keyword(s):  
Fracture Toughness ◽  
Carbon Nanotube ◽  
Epoxy Composites

Effect of toughened polyamide-coated carbon fiber fabric on the mechanical performance and fracture toughness of CFRP

2021 ◽  
pp. 002199832199945
Author(s):  
Jong H Eun ◽  
Bo K Choi ◽  
Sun M Sung ◽  
Min S Kim ◽  
Joon S Lee
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Photoelectron Spectroscopy ◽  
Mechanical Performance ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Internal Damage ◽  
Impact Tests ◽  
Flexural Tests ◽  
The Impact

In this study, carbon/epoxy composites were manufactured by coating with a polyamide at different weight percentages (5 wt.%, 10 wt.%, 15 wt.%, and 20 wt.%) to improve their impact resistance and fracture toughness. The chemical reaction between the polyamide and epoxy resin were examined by fourier transform infrared spectroscopy, differential scanning calorimetry and X-ray photoelectron spectroscopy. The mechanical properties and fracture toughness of the carbon/epoxy composites were analyzed. The mechanical properties of the carbon/epoxy composites, such as transverse flexural tests, longitudinal flexural tests, and impact tests, were investigated. After the impact tests, an ultrasonic C-scan was performed to reveal the internal damage area. The interlaminar fracture toughness of the carbon/epoxy composites was measured using a mode I test. The critical energy release rates were increased by 77% compared to the virgin carbon/epoxy composites. The surface morphology of the fractured surface was observed. The toughening mechanism of the carbon/epoxy composites was suggested based on the confirmed experimental data.

scholarly journals Displacement Rate Effects on the Mode II Shear Delamination Behavior of Carbon Fiber/Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1881
Author(s):  
Kean Ong Low ◽  
Mahzan Johar ◽  
Haris Ahmad Israr ◽  
Khong Wui Gan ◽  
Seyed Saeid Rahimian Koloor ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Peak Load ◽  
Epoxy Composites ◽  
Displacement Rate ◽  
Interface Debonding ◽  
Mode Ii ◽  
Scanning Electron Micrographs ◽  
Unstable Crack ◽  
Mode Ii Fracture ◽  
Mode Ii Fracture Toughness

This paper studies the influence of displacement rate on mode II delamination of unidirectional carbon/epoxy composites. End-notched flexure test is performed at displacement rates of 1, 10, 100 and 500 mm/min. Experimental results reveal that the mode II fracture toughness GIIC increases with the displacement, with a maximum increment of 45% at 100 mm/min. In addition, scanning electron micrographs depict that fiber/matrix interface debonding is the major damage mechanism at 1 mm/min. At higher speeds, significant matrix-dominated shear cusps are observed contributing to higher GIIC. Besides, it is demonstrated that the proposed rate-dependent model is able to fit the experimental data from the current study and the open literature generally well. The mode II fracture toughness measured from the experiment or deduced from the proposed model can be used in the cohesive element model to predict failure. Good agreement is found between the experimental and numerical results, with a maximum difference of 10%. The numerical analyses indicate crack jump occurs suddenly after the peak load is attained, which leads to the unstable crack propagation seen in the experiment.

scholarly journals Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites

2019 ◽  
Vol 6 (3) ◽  
pp. 19-00012-19-00012 ◽  
Author(s):  
Keiichi SHIRASU ◽  
Itaru TAMAKI ◽  
Go YAMAMOTO ◽  
Toshiyuki HASHIDA
Keyword(s):  
Thermal Expansion ◽  
Carbon Nanotube ◽  
Epoxy Composites

Fracture toughness and failure mechanism of graphene based epoxy composites

2014 ◽  
Vol 97 ◽  
pp. 90-99 ◽  
Author(s):  
Swetha Chandrasekaran ◽  
Narumichi Sato ◽  
Folke Tölle ◽  
Rolf Mülhaupt ◽  
Bodo Fiedler ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Failure Mechanism ◽  
Epoxy Composites

Probing deformation of double-walled carbon nanotube (DWNT)/epoxy composites using FTIR and Raman techniques

2010 ◽  
Vol 70 (10) ◽  
pp. 1460-1468 ◽  
Author(s):  
Scott R. Brownlow ◽  
Alexander P. Moravsky ◽  
Nikolai G. Kalugin ◽  
Bhaskar S. Majumdar
Keyword(s):  
Carbon Nanotube ◽  
Epoxy Composites

Influence of oxidation and distribution of carbon nanotube on mechanical properties of buckypaper/epoxy composites

2012 ◽  
Vol 32 (4) ◽  
pp. 248-257 ◽  
Author(s):  
Jing Guo ◽  
Min Li ◽  
Qianli Liu ◽  
Yizhuo Gu ◽  
Yanxia Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Epoxy Composites

scholarly journals Drawdown prepreg coating method using epoxy terminated butadiene nitrile rubber to improve fracture toughness of glass epoxy composites

2015 ◽  
Vol 50 (7) ◽  
pp. 873-884 ◽  
Author(s):  
PS Shivakumar Gouda ◽  
John D Williams ◽  
Mehdi Yasaee ◽  
Vijay Chatterjee ◽  
Dayananda Jawali ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Nitrile Rubber ◽  
Epoxy Composites ◽  
Coating Method ◽  
Improve Fracture Toughness ◽  
Butadiene Nitrile Rubber
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