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Delamination Identification in Quasi-Isotropic CFRP Laminate Using Electric Potential Technique

[+] Author Affiliations
Masahito Ueda, Yasuyuki Kato

Nihon University, Tokyo, Japan

Akira Todoroki

Tokyo Institute of Technology, Tokyo, Japan

Paper No. PVP2008-61451, pp. 173-178; 6 pages
doi:10.1115/PVP2008-61451
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4828-9 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME

abstract

Carbon fiber reinforced plastic (CFRP) laminate is very sensitive to an impact. Even a low impact creates a delamination, which deteriorates the compression strength of the laminate. Monitoring for delamination is indispensable to maintain the reliability of CFRP structures. Electric potential change method (EPCM) has been applied for CFRP as a nondestructive testing method although it has not yet been reported for the successful application to a quasi-isotropic CFRP laminate which is commonly used for various applications. Strong electrical anisotropy and inhomogenity of the laminate makes simple application of the method difficult. In this paper, a new concept was introduced to resolve the problem of the conventional method. The new method utilizes the piezoresistivity of CFRP woven fabric. Variation of strain on laminate surface due to delamination was measured as electric potential change of CFRP woven fabric. As CFRP woven fabric is generally stacked on the laminate on purpose to protect laminate surface, no additional sensor is required in the method. Delaminations were estimated from the electric potential changes as an inverse problem. Finite element studies were performed to investigate the applicability of the method. The simulation results indicated the validity of the method for delamination identification in quasi-isotropic CFRP laminate.

Copyright © 2008 by ASME

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