J. Kaleta et J. Zebracki, APPLICATION OF THE VILLARI EFFECT IN A FATIGUE EXAMINATION OF NICKEL, Fatigue & fracture of engineering materials & structures, 19(12), 1996, pp. 1435-1443
This paper presents the possibility of using the reverse magnetostrict
ion (Villari) effect in fatigue testing of ferromagnetic materials. Th
e tests were conducted on cyclically loaded nickel with no auxiliary e
xternal magnetic held. The following properties were determined: magne
tic induction B, magnetic held strength H, energy of the magnetic hyst
eresis loop Delta M (in the B-H coordinate system), plus such mechanic
al quantities as stress sigma strain epsilon, plastic strain epsilon(p
) and energy of the mechanical hysteresis loop Delta W (in the sigma-e
psilon coordinate system). A variety of magneto-mechanical characteris
tics are presented and their susceptibility to loading parameters of t
he fatigue process are discussed. A relationship between Delta W and D
elta M is demonstrated. The Villari effect is shown to be especially u
seful in determining the cyclic yield limit.