idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
idw - Informationsdienst
Wissenschaft
The Fraunhofer Institute for Nondestructive Testing IZFP carries out research and development activities in the field of nondestructive testing processes along the entire materials value chain. For customers in the automobile, aerospace, rail, energy, construction and agriculture industries, the institute offers a wide range of NDT expertise and technologies. From June 13 to 17, 2016, our researchers and engineers will present the issue of simulation regarding electromagnetic inspection techniques using FEM analysis at the 19th World Conference on Non-Destructive Testing (WCNDT) in Munich.
Currently, the development of new production integrated applications of micromagnetic NDT methods require a detailed expert knowledge in order to proof the feasibility and to optimize the application of specific devices, sensors, mechanics and set-up parameters. Often, a huge amount of experiments is necessary to establish the formulas, describing the correlations between micromagnetic and mechanical material characteristics. These developments are often very costly in terms of time and money, which is why the use of such NDT techniques often remains limited. Analytical and numerical simulations can be used in order to predict the a priori electromagnetic behaviour of the material in different inspection situations and to reduce the experimental efforts in order to accelerate new developments. Therefore, Fraunhofer IZFP has developed an FEM simulation platform using Flux software (developed by Cedrat) [1] which is able to simulate the electromagnetic field distributions and reproduce the 3MA micromagnetic signatures in different inspection situations.
The 3MA electromagnetic NDT system, developed at Fraunhofer IZFP is based on the determination of various electromagnetic properties of the material, which are detected by measurement at several frequencies and modulations. It combines 4 different magnetic NDT methods (harmonic analysis, eddy current, Barkhausen noise, and incremental permeability) [2]. For better interpretation of measuring results and equipment optimization it is necessary to simulate the signals of these NDT methods. The numerical modelling of the inspection situation by 3MA device is very challenging due to the multi-scale and complex geometry of the system, the multi-scale time signal and the management of nonlinear and hysteretic behaviour of the material. Then, an intelligent strategy calculation method is developed in order to manage the convergence and time calculation problem. The robustness of the tool is assessed by comparison between simulation and measurement.
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