Finite differences software for the numeric analysis of a non-destructive electromagnetic testing system
In this paper, theoretical bases for the development of a software for electromagnetic effects simulation based on the approximation method of finite differences using Scilab are presented. A methodology for programming the algorithm is discussed and a simulation test is conducted in order to validate it, which consists of a coil with a ferromagnetic core. Finally, this software is used in studies related to magnetic flux leakage by a simulation of a system for the measurement of magnetic flux density in plates with different defects, which include both 2D and 3D and defects with orientation of 45 degrees.
Contribuciones al método de las diferencias finitas para la resolución de las ecuaciones de Maxwell en el dominio del tiempo
En la memoria, junto a una completa revision bibliografica, se hace un estudio de los esquemas en diferencias finitas para la resolucion de las ecuaciones de maxwell en el dominio del tiempo; abordandose los conceptos de consistencia, convergencia y estabilidad en tres dimensiones.Tambien se estudia el metodo de conformacion para aproximar mejor la geometria del objeto dispersor, evitando asi falsas soluciones numericas. Se proponen modificaciones para disminuir las inestabilidades que surgen en el proceso de solucion escalonado en el tiempo. Los resultados obtenidos se validan con resultados teoricos y experimentales en dos y tres dimensiones.
Nondestructive Evaluation of Mechanical Property by Apparatus for Magnetic Measurements of Charpy Test Pieces
Since the magnetic and mechanical properties of steels are well correlated, the mechanical properties of steels can be evaluated by measuring their magnetic properties. Therefore, an apparatus for measuring the BH curves of Charpy impact test pieces was developed in order to nondestructively evaluate the integrity of nuclear reactor pressure vessels. In this study, the operation of the developed apparatus was confirmed and the relationship between the magnetic and mechanical properties of steels are discussed