Xg. Mu et al., A STUDY OF THE FATIGUE SOFTENING AND HARDENING OF STEEL BY THE MAGNETOELASTIC EFFECT METHOD, Journal of testing and evaluation, 23(2), 1995, pp. 126-129
With a specially designed sensor and testing system, a study was made
on the changing pattern of the magnetic induction sensitivity signal i
nduced by magnetic anisotropy during the fatigue processing of carbon
steel. It was found that signal change has several characteristic stag
es and obvious extreme points. The points coincided with the position
of the fatigue strain peaks. The signal change was related to fatigue
softening and hardening, and synchronous with the change in the surfac
e residual stress.