Ultrasonic Methods For The Study Of Stress Cycling Effects In Metals

Item

Title
Ultrasonic Methods For The Study Of Stress Cycling Effects In Metals
Date
1961
Index Abstract
Contrails only
Photo Quality
Incomplete
Report Number
WADD TR 60-920
Creator
Truell, Rohn
Chick, Bruce
Anderson, George
Elbaum, Charles
Findley, William
Corporate Author
Metals Research Laboratory, Brown University
Laboratory
Materials Central
Extent
23
Identifier
AD0271067
AD0271067
Access Rights
OTS
Distribution Classification
1
Contract
AF 33(616)-6945
DoD Project
7360
DoD Task
73606
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Report Availability
Full text available by request
Date Issued
1961-04
Abstract
The use of ultrasonic methods for studying defect formation and its consequences in connection with stress cycling and fatigue of aluminum is the subject of the report.

The measurement of changes of ultrasonic attenuation and velocity during stress cycling are show together with the accompanying changes in the metallographic character of the surface sample as determined by acetate replicas and optical methods as well as oxide replicas and electron micrographs.

The results of these measurements, especially in the very early stages of stress cycling, support the ideas (advanced in previous reports) that the cycling is accompanied by a dying out of dislocation damping effects, including recovery, as the result of the immobilization of the dislocation oscillation by slip processes together with the increase in scattering caused by the development of defects and strain regions accompanying further slip. It has become quite clear that further advances in this area of work will require the study of high purity aluminum and single crystal aluminum.

The creation and improvement of equipment for the automatic recording of attenuation and velocity changes has been a major part of the effort thus far, and a discussion of this equipment appears here.
Subject
Fatigue (Mechanics)
Ultrasonic Radiation
Alloys
Aluminum Alloys
Crystal Lattices
Deformation
Electron Microscopy
Measurement
Microscopy
Simulation
Stresses
Surfaces
Test Equipment
Test Methods
Ultrasonic Properties
Velocity
Publisher
Wright-Patterson Air Force Base, OH : Aeronautical Systems Division, Air Force Systems Command, United States Air Force
Distribution Conflict
No
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Format
23 pages ; 28 cm.