The quantitative interpretation by measurement using the magnetic memory method (MMM)-based on density functional theory

Abstract

The paper demonstrates the relationship between a local stress concentration state and the self magnetic leakage field (SMLF) measured by the metal magnetic memory (MMM) effect using a first-principle calculation based on the density functional theory (DFT). In order to verify the theoretical approach, blasting experiments with X70 steel pipes were performed to document the reliability of the investigation methods. Interestingly concerning the theoretical approach is the linear change of the local SMLF signal with the increase of stress which is in very good agreement with the experimental observations. A new research program for quantitative interpretation of the MMM effect was initiated.