Title

Magnetoabsorption Techniques For Measuring Material Properties

Date

1966

Index Abstract

Not Available

Photo Quality

Complete

Report Number

AFML TR 66-76

Creator

Rollwitz, William L.

Cloassen, John P.

Corporate Author

Southwest Research Inst San Antonio TX

Laboratory

Air Force Materials Laboratory

Extent

119

Identifier

AD0805794

Access Rights

Export Control

Distribution Classification

1

Contract

AF 33(657)-10326

DoD Project

7360

DoD Task

736002

DTIC Record Exists

No

Distribution Change Authority Correspondence

USAFML LTR

Distribution Conflict

No

Abstract

Research under contract AF 33(657)-10326 was continued to determine the feasibility of using magnetoabsorption for the nondestructive evaluation of material properties. Previous efforts, reported in ML-TDR-64-123 and AFML TR-65-17, have shown that magnetoabsorption signals are derived from variations of the reversible permeability of ferromagnetic specimens with magnetic environment. Further, it had been shown that magnetoabsorption signals are readily affected by changes in reversible permeability as caused by stress, heat treatment, composition, impurity, and temperature. The effort of this period has been devoted to a refinement of the magnetoabsorption measuring equipment to detect low amplitude magnetoabsorption signals from specimens offering a small effective filling factor to a sample coil or probe. These refinements are primarily discussed in the Appendices. With this improved sensitivity, variations in harmonic content of magnetoabsorption signals arising from variations in the surface properties of a plate of maraging steel were related experimentally. Magnetoabsorption waveforms were also measured from and related to a weldment of maraging steel, stressed and stress-relieved specimens of HY-80 steel, and a bulge plate of 1020 steel. Magnetoabsorption signal changes and its harmonic amplitude variations from nickel-plated aluminum rods and other ferromagnetic wires were related experimentally to applied compressive and tensile loads.

Report Availability

Full text available

Date Issued

1966-05

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Format

1 online resource