Actions for Accelerating Random-Sequence Fatigue Tests by Response Compensation and Cycle Deletion

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Accelerating Random-Sequence Fatigue Tests by Response Compensation and Cycle Deletion / F. Sherratt, PW. Davall

Conference Author
Use of Computers in the Fatigue Laboratory (1975 : New Orleans, La.)
Published
West Conshohocken, Pa. : ASTM International, 1976.
Physical Description
1 online resource (22 pages) : illustrations, figures, tables
Additional Creators
Davall, PW., Sherratt, F., American Society for Testing and Materials, and ASTM International
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Summary
A way of applying on-line compensation for system dynamic response has been used on servohydraulic and electromagnetic single-input loading devices. While continuously measuring rig response by fast Fourier transform methods, a computer monitors the demand signal and applies to the rig a version of this, modified by the inverse transfer function. Signals generated by conventional white-noise filtering, by a digital technique which allows power spectrum and amplitude probability distribution to be chosen independently, and by random selection from joint peak-trough probability distributions have been handled by the process. A by-product of the system is the detection of changes in specimen response which may coincide with the start of macrocrack growth. Acceleration of tests by deleting small amplitude cycles from the demand history is shown to have weaknesses if elements in the joint peak-trough probability matrix are simply put to zero, and an alternative way using variable width dead zones in an off-line simulation is proposed.
Dates of Publication and/or Sequential Designation
Volume 1976, Issue 613 (January 1976)
Subject(s)
Other Subject(s)
ISBN
9780803146860 (e-ISBN)
9780803105935
0803105932
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 16.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1976. 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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