Characterizing stress concentration by metal magnetic memory signal of Hp(x)

A novel method for quantitative characterization of stress concentration based on the tangential component of metal magnetic memory (MMM) signal, H-p(x), was studied via fatigue testing and MMM testing of notched plate samples. In this research, the changing regularity of H-p(x) signals is found out. A method to calculate stress concentration factor from H-p(x) signals is established, and a new conception of magnetic stress concentration factor K-H, H-p(x)(max)/H-p(x)(ave), is put forward to quantitatively characterize stress concentration in mechanical components. The research provides the potential possibility of quantitative inspection for metal magnetic memory testing.