Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

It is known that the magnetic properties of ferromagnetic materials change under fatigue and applied loads (1,2,3). These changes in the magnetic properties could be used as indicators of the stress state of the material, or possibly for predicting the remaining fatigue life. Previous reports have shown successful implementation of this magnetic measurement technique for NDE of steel samples in a laboratory enviroment. However, for this technique to be practical, a field-usable instrument must be developed. This paper will describe measurements using one such instrument, the Magnescope. It will also discuss the techniques used to evaluate the effects of applied loads, both tensile and compressive, and low cycle fatigue on a variety of materials.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 7: Characterization of Materials

Section

Ferrous Materials and Methods

Pages

2021-2028

DOI

10.1007/978-1-4615-3742-7_115

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Development of Magnetic Inspection Techniques for Evaluation of Fatigue Damage and Stress in Low Alloy Steels

La Jolla, CA

It is known that the magnetic properties of ferromagnetic materials change under fatigue and applied loads (1,2,3). These changes in the magnetic properties could be used as indicators of the stress state of the material, or possibly for predicting the remaining fatigue life. Previous reports have shown successful implementation of this magnetic measurement technique for NDE of steel samples in a laboratory enviroment. However, for this technique to be practical, a field-usable instrument must be developed. This paper will describe measurements using one such instrument, the Magnescope. It will also discuss the techniques used to evaluate the effects of applied loads, both tensile and compressive, and low cycle fatigue on a variety of materials.