Experimental and Computational Aeroelastic Analysis of a Composite Material Delta Wing in Low Subsonic Flow

2011 ◽  
Author(s):  
Kedar Sapkal ◽  
Peter J. Attar
Keyword(s):  
Composite Material ◽  
Limit Cycle ◽  
Structural Dynamics ◽  
Strain Energy ◽  
Delta Wing ◽  
Computational Study ◽  
Fiber Composite ◽  
Computational Time ◽  
Carbon Fiber Composite ◽  
Dimensional Parameter

An experimental and computational study of the flutter and limit cycle oscillations (LCOs) of a three layer, carbon fiber composite material 45° delta wing is presented. The computational aeroelastic model utilizes a set of nonlinear structural dynamics (modal) equations which are coupled to a vortex lattice aerodynamic model. The nonlinear modal equations for the structure are formulated using a system identification methodology. To reduce the computational time needed in the computation of the strain energy needed to construct the reduced order structural dynamics model, a new algorithm which uses a Smolyak sparse grid technique is proposed to perform the sampling of strain energy data used for generation of the equations of motion. Experiments and computations are performed, and compared, for a number of layup configuration angles. The qualitative agreement between experimental flutter and limit cycle results is good with both sets of results displaying similar trends with respect to variations in layup angle and a non-dimensional parameter which gives a measure of the bending-torsion coupling in the laminate.

Electrical conductivity identification of a carbon fiber composite material plate using a rotating magnetic field and multi-coil eddy current sensor

2018 ◽  
Vol 83 (2) ◽  
pp. 20901 ◽  
Author(s):  
Ahmed Chaouki Lahrech ◽  
Bachir Abdelhadi ◽  
Mouloud Feliachi ◽  
Abdelhalim Zaoui ◽  
Mohammed Naїdjate
Keyword(s):  
Magnetic Field ◽  
Neural Networks ◽  
Electrical Conductivity ◽  
Composite Material ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Rotating Magnetic Field ◽  
Current Sensor ◽  
Carbon Fiber Composite ◽  
Fiber Composite Material

This paper proposes a contactless method for the identification of the electrical conductivity tensor of a carbon fiber composite materials plate using a rotating magnetic field and multi-coil eddy current sensor. This sensor consists of identical rectangular multi-coil, excited by two-phase sinusoidal current source in order to generate a rotating magnetic field and to avoid the mechanical rotation of the sensor. The fibers orientations, the longitudinal and transverse conductivities in each ply of carbon fiber composite material plate were directly determined with analysis of the impedance variation of each coil as function of its angular position. The inversion process is based on the use of artificial neural networks. The direct calculation associated with artificial neural networks makes use of 3D time-harmonic finite element method based on the A, V–A formulation.

Research on EIS-Based Anomaly Detection Technique for Composite Materials

2014 ◽  
Vol 556-562 ◽  
pp. 3056-3059
Author(s):  
Chao Sun ◽  
En Sheng Dong ◽  
Yong Heng Li ◽  
Bing Zhu
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Anomaly Detection ◽  
Fiber Composite ◽  
Electrical Impedance Spectroscopy ◽  
Carbon Fiber Composite ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Unit Model ◽  
Double Electrode

The application of advanced composite materials in airplane is becoming more and more. Along with the increase of its service time, it may be abnormal. It needs to take an anomaly detection. The electrical impedance spectroscopy (EIS) is applied to the anomaly detection of composite material components in airplane. A uniplanar sensor with double-electrode and two carbon fiber composite samples are made, an experiment circuit is designed. In order to verify the effectiveness of the experimental circuit, the EIS of the Randles unit model circuit is measured, as well as the two composite material samples using the dual-electrode measurement method. The picture of EIS is drawn in Matlab and comparison and analysis are carried out. The preliminary experimental results indicate that the anomalies can be seen by measuring the EIS of the composite materials. It is feasible for the EIS to be applied in the anomaly detection of the composite materials in airplane.

A CRASHWORTHINESS SIMULATION FOR A LIGHT AIRCRAFT CONSTRUCTED OF COMPOSITE MATERIALS

2015 ◽  
Vol 39 (4) ◽  
pp. 829-843 ◽  
Author(s):  
Pu-Woei Chen ◽  
Kuan-Jung Chen
Keyword(s):  
Composite Material ◽  
Aluminum Alloy ◽  
Composite Materials ◽  
Fiber Composite ◽  
Impact Angle ◽  
The Finite Element Method ◽  
Dynamic Impact ◽  
Carbon Fiber Composite ◽  
Impact Speed ◽  
Impact Simulations

This study analyzes the crashworthiness of a light aircraft that is constructed from composite materials. The finite element method is employed to conduct dynamic impact simulations on carbon fiber composite fuselages. The results show that the safe impact speed for an aluminum alloy cockpit crashed at a 30° impact angle is 9.59 m/s, but a cockpit made of composite material can withstand a speed greater than 18.05 m/s. The safe impact angle for an aluminum alloy cockpit is 16.56°, but that for a composite cockpit is 84.9°. The safety crash zone for a composite material cockpit is 160% greater than that for an aluminum alloy cockpit.

Design of the Hybrid-Propeller Shaft Using Composite Materials

2013 ◽  
Vol 284-287 ◽  
pp. 687-691
Author(s):  
Hyun Sik Kim ◽  
Dong Pyo Hong ◽  
Hee Yong Kang
Keyword(s):  
Composite Material ◽  
Fiber Composite ◽  
Steel Structure ◽  
Performance Standards ◽  
Aluminum Surface ◽  
Material Research ◽  
Propeller Shaft ◽  
Carbon Fiber Composite ◽  
Fiber Composite Material ◽  
The One

The propeller shaft of rear-wheel drive vehicle transfers power from the engine to rear wheels through the differential gear box. Generally the propeller shaft has a two-piece steel structure of more than 10kg of weight. In this paper, we designed the one-piece hybrid propeller shaft using the aluminum, carbon fiber composite material and glass fiber composite material. Research on the adhesive strength of the hybrid propeller shaft with respect to roughness of aluminum surface was conducted. The one piece hybrid propeller shaft satisfying the performance standards of propeller shaft such as statistic torsion torque strength and first bending natural frequency was manufactured. The manufactured hybrid shaft was assembled with the suitable connecting parts and analyzed for performance verification. This hybrid propeller shaft satisfies all performance standards of propeller shaft for automobile application. The hybrid shaft has vibration characteristics of 237Hz significantly higher than the standard characteristic of 150Hz of the existing two-piece steel structure propeller shaft.

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