Effect of alumina nanoparticles on the enhancement of impact and flexural properties of the short glass/carbon fiber reinforced epoxy based composites

2015 ◽  
Vol 16 (1) ◽  
pp. 188-195 ◽  
Author(s):  
Akash Mohanty ◽  
V. K. Srivastava
Keyword(s):  
Carbon Fiber ◽  
Alumina Nanoparticles ◽  
Flexural Properties ◽  
Fiber Reinforced ◽  
Glass Carbon ◽  
Carbon Fiber Reinforced ◽  
Short Glass

The wavenumber imaging of fiber waviness in hybrid glass–carbon fiber reinforced polymer composite plates

2021 ◽  
pp. 002199832110476
Author(s):  
Haiyan Zhang ◽  
Yan Ren ◽  
Jiaxin Song ◽  
Qi Zhu ◽  
Xuefen Ma
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Layered System ◽  
Fiber Reinforced ◽  
Fiber Waviness ◽  
Computational Performance ◽  
Reinforced Polymer ◽  
Glass Carbon ◽  
Carbon Fiber Reinforced

Out-of-plane waviness is one of the most common defects which degenerates the strength, stiffness, and fatigue life of hybrid glass–carbon fiber–reinforced polymer composites (FRPs). An accurate and high-speed non-destructive testing method is highly desired for large composite structures in industries. Ultrasonic phased array is a great candidate for such application. This paper applies the wavenumber algorithm to image the waviness in hybrid FRP plates which are a multi-layered medium. The central frequency of 5 MHZ is chosen in order to maximize the ply resonance. Transducers are migrated virtually to each interface between glass and carbon plies in order to overcome the difficulty of wave propagation analysis in such multi-layered system. The wavenumber algorithm demonstrates a better computational performance compared to that of the traditional total focusing method (TFM) in time domain up to 6 times. The glass ply depth and waviness angle can be more accurately presented with relative errors less than 1.5% and 14.8%, respectively. In addition, the resin-rich defect characterization is also achievable with a maximum error of 14.4%.

Controlling off-axis stiffness and stress-relaxation of carbon fiber-reinforced polymer using alumina nanoparticles

2017 ◽  
Vol 52 (18) ◽  
pp. 2483-2491 ◽  
Author(s):  
Amy Garner ◽  
Moneeb Genedy ◽  
Usama Kandil ◽  
Mahmoud Reda Taha
Keyword(s):  
Carbon Fiber ◽  
Stress Relaxation ◽  
Mechanical Analysis ◽  
Fiber Reinforced Polymer ◽  
Alumina Nanoparticles ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Epoxy Nanocomposites ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

This investigation experimentally examines the effect of incorporating alumina nanoparticles on the off-axis stiffness and stress-relaxation of carbon fiber-reinforced polymer composites. Four epoxy–alumina nanoparticle nanocomposites incorporating 0.0, 1.0, 2.0, and 3.0 wt% alumina nanoparticles of the total weight of epoxy are examined. Off-axis tension stiffness and stress-relaxation tests were performed on carbon fiber-reinforced polymer coupons fabricated with alumina nanoparticles–epoxy nanocomposites. Dynamic mechanical analysis testing of neat epoxy and epoxy nanocomposites incorporating alumina nanoparticles was used to identify the stiffness and relaxation behavior of the alumina nanoparticles–epoxy nanocomposite matrix. Fourier transform infrared spectroscopy was used to observe chemical changes when alumina nanoparticles are mixed with epoxy. It is shown that using alumina nanoparticles at a concentration close to 2.0 wt%, can reduce the off-axis stiffness by ∼30% and increase the off-axis stress-relaxation of carbon fiber-reinforced polymer by ∼10%.

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