The present study has attempted to analyze the distributions of vertical magnetic flux density Bz above growing fatigue cracks subjected to various stress ratios R in SUS 304 stainless steel in which plasticity-induced martensitic transformation has occurred at room temperature in air. FEM calculations have been made to obtain Bz distributions above fatigue cracks by using composite permanent magnet models. The martensitic transformation regions around fatigue cracks were modeled as composites of permanent magnets having different B-H properties varying according to the content of α′ martensitic phase transformed. The resultant distributions of leakage magnetic flux density above fatigue cracks obtained by FEM agree well with those obtained by experiments.

Topics:
Fatigue cracks, Finite element methods, Finite element model, Magnetic fields, Phase transitions, Stainless steel, Composite materials, Magnetic induction, Martensitic transformations, Permanent magnets, Leakage, Plasticity, Stress, Temperature
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Copyright © 2004
 by ASME
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