Nondestructive evaluation of ferromagnetic materials by a magnetometer like experimental arrangement
The paper presents experimental results regarding the influence of mechanical stresses and thermal treatments on the Barkhausen noise and magnetization characteristic of MolyPermalloy and MuMetal ferromagnetic samples. The samples are different in stress magnitude and localization and in their thermal history. The level of Barkhausen noise and the changes in magnetization characteristic are estimated by measuring the sensitivity and transduction gain of magnetometer like coils configurations which employ the studied ferromagnetic samples as their nonlinear ferromagnetic cores. The present method is unique in the sense that the two factors (one factor is related to the internal magnetic noise, and the other one is related to the form of the magnetic characteristic) are obtained by employing a single relatively simple experimental arrangement. Various types of stresses, which are different in magnitude and localization, become distinguishable one from the other, when considering their differential effects on the two factors. Several possible experimental arrangements are shown.
- Research Organization:
- Ben-Gurion Univ. of the Negev, Beer-Sheva (Israel)
- OSTI ID:
- 6369459
- Journal Information:
- J. Nondestr. Eval.; (United States), Vol. 6:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
FERROMAGNETIC MATERIALS
EDDY CURRENT TESTING
MAGNETOMETERS
SENSITIVITY
MOLYBDENUM ALLOYS
PERMALLOY
HEAT TREATMENTS
MAGNET COILS
MAGNETIC FIELDS
MAGNETIZATION
NOISE
STRESSES
TEMPERATURE EFFECTS
TRANSDUCERS
ALLOYS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC TESTING
EQUIPMENT
IRON ALLOYS
MAGNETIC MATERIALS
MATERIALS
MATERIALS TESTING
MEASURING INSTRUMENTS
NICKEL ALLOYS
NONDESTRUCTIVE TESTING
TESTING
360104* - Metals & Alloys- Physical Properties
360103 - Metals & Alloys- Mechanical Properties
420500 - Engineering- Materials Testing