Resin modification on interlaminar shear property of carbon fiber/epoxy/nano-CaCO3 hybrid composites

2015 ◽  
Vol 38 (9) ◽  
pp. 2035-2042 ◽  
Author(s):  
Hongwei He ◽  
Feng Gao
Keyword(s):  
Carbon Fiber ◽  
Hybrid Composites ◽  
Shear Property ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy

Microstructure optimizations for improving interlaminar shear strength and self-healing efficiency of spread carbon fiber/epoxy laminates containing microcapsules

2020 ◽  
Vol 55 (1) ◽  
pp. 27-38
Author(s):  
Yasuka Nassho ◽  
Kazuaki Sanada
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Optical Microscope ◽  
Interlaminar Shear Strength ◽  
Self Healing ◽  
Short Beam ◽  
Healing Efficiency ◽  
Beam Shear ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy

The purpose of this study is to improve interlaminar shear strength and self-healing efficiency of spread carbon fiber (SCF)/epoxy (EP) laminates containing microcapsules. Microencapsulated healing agents were embedded within the laminates to impart a self-healing functionality. Self-healing was demonstrated on short beam shear specimens, and the healing efficiency was evaluated by strain energies of virgin and healed specimens. The effects of microcapsule concentration and diameter on apparent interlaminar shear strength and healing efficiency were discussed. Moreover, damaged areas after short beam shear tests were examined by an optical microscope to investigate the relation between the microstructure and the healing efficiency of the laminates. The results showed that the stiffness and the apparent interlaminar shear strength of the laminates increased as the microcapsule concentration and diameter decreased. However, the healing efficiency decreased with decreasing the microcapsule concentration and diameter.

Epoxy Modified Polyurethanes Coated High Modulus Carbon Fiber: Synthesis and Properties Studies

2011 ◽  
Vol 217-218 ◽  
pp. 728-733 ◽  
Author(s):  
Yan Hong Tian ◽  
Zhan Qing Liu ◽  
Su Mei Kang ◽  
Xue Jun Zhang
Keyword(s):  
Carbon Fiber ◽  
Raw Materials ◽  
Crosslinking Agent ◽  
Epoxy Composites ◽  
High Modulus ◽  
Coating Agent ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy ◽  
Thermal Stability Of ◽  
Properties Of Composites

With toluene 2, 4-diisocyanate (TDI), polyethylene glycol (PEG) and 2,3-Epoxy-1-prop -anol (glycidol) used as the raw materials, two epoxy terminated polyurethanes (EPU) was synthesized by prepolymerization and closed end. Moreover, EPU with high toughhess is chosen as a coating agent for carbon fiber with three ethylene tetramine (TETA) as curing agen. The influence of the content of crosslinking agent in the coating layer on properties of composites and the mechanism of interface toughness are investigated. The chemical structure and thermal property of the EPU were studied with FTIR, 1HNMR and TGA, respectively. It proves that the thermal stability of EPU is more stable than epoxy coating. The interlaminar shear strength (ILSS) of the sized high modulus carbon fiber/epoxy composites is improved to 71MPa, which increased by 19.4% compared with the composites reinforced by unsized high modulus carbon fiber, and DMTA show that using EPU as a new kind of polymer coating for carbon fiber is a feasible method to improve the interfacial performance of high modulus carbon fiber/epoxy composites.

Preparation of Sizing Agents for Carbon Fiber Adapt to Various Polymer Matrix

2011 ◽  
Vol 306-307 ◽  
pp. 750-753
Author(s):  
Juan Chen ◽  
Jian Ye Liu ◽  
Dong Zhi Wang ◽  
Xin Rui Zhou
Keyword(s):  
Carbon Fiber ◽  
Epoxy Resin ◽  
Abrasion Resistance ◽  
Vinyl Ester ◽  
Resin Composite ◽  
Reinforced Composite ◽  
Epoxy Resin Composite ◽  
Interlaminar Shear ◽  
Sizing Agents ◽  
Carbon Fiber Epoxy

Emulsion type sizing agent for carbon fiber was synthesized using epoxy resin (E-51) and epoxidized polybutadiene (EPB) by adding emulsifiers and other additives. Standing stabilization of sizing agents was analyzed. Meanwhile, abrasion resistance, fluffs and breakage, stiffness were used to analyze the processability of carbon fiber. The effect of sizing agents on interfacial adhesion of carbon fiber/resin composites was estimated by interlaminar shear strength (ILSS). The results showed that the sizing agent could significantly improve processability of carbon fiber due to the increase of abrasion resistance and reduce of fluffs and breakage. By adding EPB in sizing agent and adjusting the ratio to E-51, the flexibility of carbon fiber was ameliorated and the sizing agent could adapt to various resin matrices. Compared to the desized carbon fiber reinforced composite, ILSS of sized carbon fiber/epoxy resin composite was increased by 16.9%, and ILSS of sized carbon fiber/vinyl ester resin composite was enhanced by 19.1%.

Preparation of MWCNT/Carbon Fabric Reinforced Hybrid Nanocomposite and Examination of its Mechanical Properties

2008 ◽  
Vol 589 ◽  
pp. 269-274 ◽  
Author(s):  
Gábor Romhány ◽  
Gábor Szebényi
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Hybrid Composite ◽  
Tensile Tests ◽  
Hybrid Nanocomposite ◽  
Shear Rates ◽  
The Matrix ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy

In our work we have prepared carbon fiber/epoxy composite and carbon fiber/carbon nanotube/epoxy hybrid nanocomposite laminates by hand laminating assisted by vacuumbag technology. During the production of the specimens we have encountered the viscosity increasing effect of nanotube filling, which we characterized by a viscosity test. The results of the test showed, that in the lowest shear rate range carbon nanotube filling can cause an increase of viscosity by three orders of magnitude, but also at higher shear rates the viscosity of the nanotube filled epoxy resin was ten times the viscosity of the unfilled resin. Mechanical properties of the composite and hybrid composite have been compared by tensile, bending and interlaminar shear tests. During the tensile tests AE signals have also been recorded. The fracture surfaces have been examined by SEM micrographs. The nanotube filling has decreased the tensile strength and the modulus of elasticity by 7-8 percent presumably indirectly, the bending properties didn’t change noticeably, but the interlaminar shear strength of the composite has increased by 15 percent thanks to nanotube filling of the matrix. The decrease of the delamination inclination of the hybrid composite has been affirmed both by the AE and SEM results.

scholarly journals Short Beam Shear Behavior and Failure Characterization of Hybrid 3D Braided Composites Structure with X-ray Micro-Computed Tomography

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1931
Author(s):  
Liwei Wu ◽  
Xiaojun Sun ◽  
Chunjie Xiang ◽  
Wei Wang ◽  
Fa Zhang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Transverse Shear ◽  
Failure Modes ◽  
Hybrid Composites ◽  
Shear Loading ◽  
Micro Computed Tomography ◽  
Braided Composites ◽  
Braided Composite ◽  
Shear Property ◽  
Beam Shear

Three-dimensional braided composite has a unique spatial network structure that exhibits the characteristics of high delamination resistance, damage tolerance, and shear strength. Considering the characteristics of braided structures, two types of high-performance materials, namely, aramid and carbon fibers, were used as reinforcements to prepare braided composites with different hybrid structures. In this study, the longitudinal and transverse shear properties of 3D braided hybrid composites were tested to investigate the influences of hybrid and structural effects. The damage characteristics of 3D braided hybrid composites under short beam shear loading underwent comprehensive morphological analysis via optical microscopy, water-logging ultrasonic scanning, and X-ray micro-computed tomography methods. It is shown that the shear toughness of hybrid braided composite has been improved at certain degrees compared with the pure carbon fiber composite under both transverse and longitudinal directions. The hybrid braided composites with aramid fiber as axial yarn and carbon fiber as braiding yarn exhibited the best shear toughness under transverse shear loading. Meanwhile, the composites with carbon fiber as axial yarn and aramid fiber as braiding yarn demonstrated the best shear toughness in the longitudinal direction. Due to the different distribution of axial and braiding yarns, the transverse shear property of hybrid braided structure excels over the longitudinal shear property. The failure modes of the hybrid braided composite under the two loading directions are considerably different. Under transverse loading, the primary failure mode of the composites is yarn fracture. Under longitudinal loading, the primary failure modes are resin fracture and fiber slip. The extensive interfacial effects and the good deformation capability of the hybrid braided composites can effectively prevent the longitudinal development of internal cracks in the pattern, improving the shear properties of braided composites.

Sliding wear performance of nano-SiO2/short carbon fiber/epoxy hybrid composites

Wear ◽  
2009 ◽  
Vol 266 (7-8) ◽  
pp. 658-665 ◽  
Author(s):  
Qing Bing Guo ◽  
Min Zhi Rong ◽  
Guo Liang Jia ◽  
Kin Tak Lau ◽  
Ming Qiu Zhang
Keyword(s):  
Carbon Fiber ◽  
Sliding Wear ◽  
Hybrid Composites ◽  
Wear Performance ◽  
Short Carbon Fiber ◽  
Nano Sio2 ◽  
Carbon Fiber Epoxy ◽  
Short Carbon
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