Evaluation of a Simple Proof Test of Planar Ferrite Cores

TL;DRAbstract

Abstract : Ferrites are soft magnetic materials that have a wide range of uses in microwave circuits. Many otherwise flight-qualified parts may have a variety of defects arising from fabrication and handling. A finite-element analysis (FEA) was performed to design a simple proof test for a particular planar ferrite core geometry. A 3-point bend test and three different geometries of 4-point bend tests were modeled to determine the distribution of tensile stress on the bottom of the part. The objective was to generate a minimum stress gradient to achieve uniform stress levels throughout the entire part. The simulations indicate that the largest tensile stress is between 1880 and 1,131 psi. Three-point bend tests conducted on two cores indicated that failure was consistent with predictions of the models. The locations of the failures in the tests render these simple proof tests inappropriate for the specific defects of interest.Ferrites are soft magnetic materials that have a wide range

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