A Fast Forward Simulation Scheme for Eddy Current Testing of Crack in a Structure of Carbon Fiber Reinforced Polymer Laminate

Yali Du,Zhenmao Chen,Xudong Li,Toshiyuki Takagi,Shejuan Xie,Tetsuya Uchimoto

doi:10.1109/access.2019.2947365

Yali Du, Zhenmao Chen + Show 4 more

Open Access

https://doi.org/10.1109/access.2019.2947365

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Journal: IEEE Access	Publication Date: Jan 1, 2019
Citations: 8	License type: CC BY 4.0

Affiliation: Xi'an Jiaotong University, Tohoku University

Abstract

High frequency Eddy Current Testing (ECT) is one of the key non-destructive testing techniques for ensuring integrity of a structure of Carbon Fiber Reinforced Polymer (CFRP) material. An efficient numerical simulator is indispensable to enhance the performance of quantitative ECT for CFRP structures from both point of view of probe optimization and defect sizing. In this paper, a fast forward simulation scheme based on the A-Φ formulation and databases approach is proposed, implemented and experimentally validated for the rapid and high precision simulation of ECT signals due to defects in a CFRP plate by updating an FEM-BEM hybrid code for ECT problem. Comparison of numerical results of the present method with those of the conventional full FEM-BEM code and the experimental results for artificial cracks in CFRP laminate plates indicates that the proposed novel fast forward scheme can predict ECT signals over 300 times faster but without worsening numerical accuracy, which enables it to be applied to efficient reconstruction of cracks in CFRP plates and for probe optimization.

Highlights

In recent decades, carbon fiber reinforced polymer (CFRP) has growing applications in wide engineering fields, e.g., aerospace, transportation, renewable energy etc., due to its light weight and high specific mechanical properties compared with traditional metallic structural materials
Du et al.: Fast Forward Simulation Scheme for Eddy Current Testing (ECT) of Crack in a Structure of CFRP Laminate developed a finite element and edge element hybrid numerical code based on the reduced vector potential (Ar) formulation for simulation of the ECT of CFRP material [16]
The traditional fast solver cannot treat the ECT of anisotropic material such as the CFRP plate, as the conductivity needs to be a constant [30], [31]. In view of these backgrounds, the aim of this paper is to develop a fast forward numerical scheme and solver based on the conventional FEM-BEM hybrid code and the databases type fast forward simulation approach to solve the ECT problem for the anisotropic CFRP material, and to demonstrate its feasibility and efficiency through comparison with both the experimentally measured signals and the numerical results simulated with the conventional full FEM-BEM code

Summary

INTRODUCTION

Carbon fiber reinforced polymer (CFRP) has growing applications in wide engineering fields, e.g., aerospace, transportation, renewable energy etc., due to its light weight and high specific mechanical properties compared with traditional metallic structural materials. Y. Du et al.: Fast Forward Simulation Scheme for ECT of Crack in a Structure of CFRP Laminate developed a finite element and edge element hybrid numerical code based on the reduced vector potential (Ar) formulation for simulation of the ECT of CFRP material [16]. The coefficient matrices [H11] and qu containing the information of the CFRP material and the exciting coils can be calculated a priori as they are independent of the crack for a given inspection CFRP target plate Once these unflawed fields have been re-calculated and stored as databases, one does not need to compute them again for calculating perturbed ECT signals due to a crack of different profile. The computational burden can be significantly reduced for the forward analysis but without worsen the numerical precision

ESTABLISHMENT OF THE DATABASES OF

IMPEDANCE SIGNAL CALCULATION

CONCLUSION