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Electric Field Leakage Nondestructive Testing Principle and its Simulation

A new electric field leakage (EFL) testing principle is presented. The aim of this paper is to theoretically demonstrate its potential for inspection of external and internal discontinuities in conducting materials (particularly for nonferrous metals) by injecting a direct current into the tested object and measuring the electric field leaking from the discontinuity. Firstly, the principle of EFL testing is illustrated based on the boundary conditions of electric field. Then, the electric field characteristics outside a direct-current-carrying conductor are described. Last, simulations are carried out to further discuss the possibility of the EFL testing principle.

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