Effect of dents in laminated carbon composite beams on modified anisotropic electric potential analysis

2018 ◽  
Vol 200 ◽  
pp. 340-345 ◽  
Author(s):  
Akira Todoroki ◽  
Takuya Yamane
Keyword(s):  
Electric Potential ◽  
Carbon Composite ◽  
Composite Beams ◽  
Potential Analysis

Evaluation of mechanical and vibration behavior of hybrid epoxy carbon composite beam carrying micron-sized CTBN rubber and nanosilica particles

2018 ◽  
Vol 233 (9) ◽  
pp. 1738-1752
Author(s):  
C Senthamaraikannan ◽  
R Ramesh
Keyword(s):  
Free Vibration ◽  
Frequency Response ◽  
Response Function ◽  
Epoxy Matrix ◽  
Composite Beam ◽  
Frequency Response Function ◽  
Secondary Reinforcement ◽  
Carbon Composite ◽  
Composite Beams ◽  
Rubber Particles

The suppression of vibration in dynamic structures is considered as one of the important functional requirements. In the present investigation, the free vibration behaviour of the woven carbon-epoxy composite beams was studied by blending nanosilica and micro-sized carboxyl-terminated butadiene acrilonitrile copolymer CTBN rubber in an epoxy matrix. The basic I and channel shapes widely used in structural applications were considered for fabrication of composite beams and made by hand layup method. The hybrid specimens were prepared by keeping 9% rubber particles by weight as stable primary ingredients in epoxy and the secondary reinforcement nanosilica was added by varying the weight fraction of 6% and 11%. The mechanical behaviour study and free vibration test were conducted as per ASTM standards and compared between virgin and hybrid composites. The addition of nanosilica, as secondary reinforcement in an epoxy matrix improves the mechanical properties of CTBN rubber-blended carbon composites. The structural beams were tested by impulse frequency response method under cantilever boundary conditions. Frequency response function plots were recorded and compared for all considered beam samples. The decreased amplitude response observed in frequency response function plot for micro rubber added samples of 9 wt%, indicate enhanced passive damping characteristics. The nanosilica, along with the micro rubber particles, shows improved passive damping capacity than virgin carbon composite beam. Finite element modelling of the composite beam was done for modal response using ANSYS® application software. Mode shapes and corresponding modal frequency of all types of beams have been compared and discussed.

Preparation and Characterization of Activated Sericite Modified by Fluorosilicate and Acid

2012 ◽  
Vol 512-515 ◽  
pp. 661-665 ◽  
Author(s):  
Yue Bo Wang ◽  
Hao Ding ◽  
Le Fu Mei ◽  
Wei Jiang
Keyword(s):  
Nitric Acid ◽  
Chemical Analysis ◽  
Electric Potential ◽  
Electrostatic Force ◽  
Xrd Analysis ◽  
Layer Charge ◽  
Acid Activation ◽  
Potential Analysis ◽  
High Layer ◽  
Sodium Fluosilicate

Although sericite belongs to 2:1 clay minerals, it hardly has intercalation properties because it has high layer charge density, which produces pretty strong electrostatic force. Therefore, the purpose of activation is to permanently reduce the layer charge of sericite and obtain numbers of exchangeable cations. The original sericite (S0) was sintered at 800 °C for 1 h. After that, thermal-treated sericite (S1) was activated with sodium fluosilicate and nitric acid, whose effects were characterized by X-ray diffraction (XRD) analysis, chemical analysis and zeta electric potential analysis. The dissolving-out amount of Al3+ of acid-treated product (S2) reached circa 65 mg/g at the optimal processing conditions. After sodium modification with NaCl, CEC of final resulting product (S3) was increased to 14.34 meq/100g compared with that of original sericite (4.94 meq/100g). The results of chemical analysis and zeta electric potential analysis indicated that acid activation with sodium fluosilicate and nitric acid decreased the layer charge of sericite.

Non-contact imaging of carbon composite structures using electric potential (displacement current) sensors

2006 ◽  
Vol 17 (6) ◽  
pp. 1470-1476 ◽  
Author(s):  
W Gebrial ◽  
R J Prance ◽  
C J Harland ◽  
P B Stiffell ◽  
H Prance ◽  
...  
Keyword(s):  
Electric Potential ◽  
Composite Structures ◽  
Carbon Composite ◽  
Displacement Current ◽  
Current Sensors ◽  
Contact Imaging
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