Reconstruction of complex shaped crack from ECT signals based on a fast forward solver using an advanced multi-media element

Yingsong Zhao, Cherdpong Jomdecha, Shejuan Xie, Zhenmao Chen, Pan Qi, Shusheng Liao, Tetsuya Uchimoto, Toshiyuki Takagi

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, the conventional database type fast forward solver for efficient simulation of eddy current testing (ECT) signals is upgraded by using an advanced multi-media finite element (MME) at the crack edge for treating inversion of complex shaped crack. Because the analysis domain is limited at the crack region, the fast forward solver can significantly improve the numerical accuracy and efficiency once the coefficient matrices of the MME can be properly calculated. Instead of the Gauss point classification, a new scheme to calculate the coefficient matrix of the MME is proposed and implemented to upgrade the ECT fast forward solver. To verify its efficiency and the feasibility for reconstruction of complex shaped crack, several cracks were reconstructed through inverse analysis using the new MME scheme. The numerical results proved that the upgraded fast forward solver can give better accuracy for simulating ECT signals, and consequently gives better crack profile reconstruction.

Original languageEnglish
Pages (from-to)621-629
Number of pages9
JournalInternational Journal of Applied Electromagnetics and Mechanics
Volume64
Issue number1-4
DOIs
Publication statusPublished - 2020

Keywords

  • Fast forward solver
  • crack shape reconstruction
  • eddy current test
  • multi-media element

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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