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Time-Independent and Time-Dependent Deformation of Metals / TH. Alden

Conference Author
Mechanical Testing for Deformation Model Development (1980 : Bal Harbour, Florida)
Published
West Conshohocken, Pa. : ASTM International, 1982.
Physical Description
1 online resource (19 pages) : illustrations, figures, tables
Additional Creators
Alden, TH., American Society for Testing and Materials, and ASTM International
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Summary
In most contemporary theories the deformation of metals is treated as a time-dependent or viscous process. A quasi time-independent character is sometimes introduced by means of an athermal back ¿̐ưstress¿̐ư from long-range obstacles, but only at T = 0 K or in other limited temperature ranges is the deformation predicted to show time-independent behavior. Several experimental results, mainly on pure face-centered-cubic metals, are in disagreement with this theoretical approach. The most important results are that (1) time-independent strain (loading strain) has been measured on sudden increase of stress during creep deformation, even for very small stress increments; and (2) the strain rate ratio measured in a load relaxation experiment, R = ??r/??l, is consistently less than unity and increases toward unity as the stress approaches saturation. These results are reviewed and new data from load relaxation on lead and the superplastic Pb-Sn eutectic are presented. It is the author's conclusion from these data that time-independent deformation may be more important than is normally acknowledged. Thus, in future efforts at modeling plasticity, the possibility of a dual time-dependent, time-independent nature ought to be considered.
Dates of Publication and/or Sequential Designation
Volume 1982, Issue 765 (January 1982)
Subject(s)
Other Subject(s)
ISBN
9780803148307 (e-ISBN)
9780803107373
0803107374
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 33.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1982. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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