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Advances in Aircraft and Spacecraft Science
  Volume 4, Number 5, September 2017 , pages 515-528
DOI: https://doi.org/10.12989/aas.2017.4.5.515
 

Delamination evaluation on basalt FRP composite pipe by electrical potential change
Wael A. Altabey

 
Abstract
    Since composite structures are widely used in structural engineering, delamination in such structures is an important issue of research. Delamination is one of a principal cause of failure in composites. In This study the electrical potential (EP) technique is applied to detect and locate delamination in basalt fiber reinforced polymer (FRP) laminate composite pipe by using electrical capacitance sensor (ECS). The proposed EP method is able to identify and localize hidden delamination inside composite layers without overlapping with other method data accumulated to achieve an overall identification of the delamination location/size in a composite, with high accuracy, easy and low-cost. Twelve electrodes are mounted on the outer surface of the pipe. Afterwards, the delamination is introduced into between the three layers (0o/90o/0o)s laminates pipe, split into twelve scenarios. The dielectric properties change in basalt FRP pipe is measured before and after delamination occurred using arrays of electrical contacts and the variation in capacitance values, capacitance change and node potential distribution are analyzed. Using these changes in electrical potential due to delamination, a finite element simulation model for delamination location/size detection is generated by ANSYS and MATLAB, which are combined to simulate sensor characteristic. Response surfaces method (RSM) are adopted as a tool for solving inverse problems to estimate delamination location/size from the measured electrical potential changes of all segments between electrodes. The results show good convergence between the finite element model (FEM) and estimated results. Also the results indicate that the proposed method successfully assesses the delamination location/size for basalt FRP laminate composite pipes. The illustrated results are in excellent agreement with the experimental results available in the literature, thus validating the accuracy and reliability of the proposed technique.
 
Key Words
    delamination assessing; electrical capacitance sensor (ECS); basalt FRP pipe; FEM; response surfaces method (RSM); least square error method
 
Address
Wael A. Altabey:
1) International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China
2) Department of Mechanical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
 

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