Document Type

Patent

Publication Date

4-30-1991

Abstract

A non-destructive evaluation technique for deriving stress in ferromagnetic materials including deriving anhysteretic and hysteresis magnetization curves for the material in both unstressed and stressed states. The anhysteretic curve is expressed as a Langevin function. The stress is expressed as an equivalent magnetic field dependent on stress and change of magnetostriction with magnetization. By measurement of these bulk magnetic properties, stress can be derived.

Patent Number

US 5,012,189

ISURF Reference Number

01128

Assignee

Iowa State University Research Foundation, Inc.,

Application Number

US 07/354,819

Date Filed

5-22-1989

Language

en

File Format

application/pdf

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