Cumulative Damage Analysis in Structural Fatigue / LF. Impellizzeri
- Conference Author:
- Effects of Environment and Complex Load History on Fatigue Life (1968 : Atlanta, Ga.)
- Physical Description:
- 1 online resource (29 pages) : illustrations, figures, tables
- Additional Creators:
- Impellizzeri, LF., American Society for Testing and Materials, and ASTM International
- Access Online:
- ezaccess.libraries.psu.edu
- Restrictions on Access:
- License restrictions may limit access. and Subscription required for access to full text.
- Summary:
- The influence of residual stress on fatigue is studied using electron microscopy on fracture surfaces of specimens tested under spectrum loading. The level of residual stress that exists at the point of stress concentration is shown to be one of the parameters affecting striation spacing. A review of numerous variable amplitude test results generated by government agencies and aerospace companies further suggests that a straightforward technique quantitatively defining the effect of continually changing residual stress patterns should provide a reliable tool for predicting cumulative damage in fatigue. The two major difficulties relating to the utilization of residual stress considerations in a cumulative damage rule are: (a) determining the level of residual stress existing at the notch root; and (b) computing its effect on N, cycles to failure. A cumulative damage rule including the developments in (a) and (b) above is presented. Essentially, the rule involves the use of conventional ?n/N computations, except the selection of a value for N is affected by the levels and variations of residual stress existing at a discontinuity. Loading parameters that affect fatigue-life predictions using the cumulative damage rule include peak load level, load ratio, block size, and load-level sequence. Typical laboratory spectrum-test results that are investigated include the NASA gust spectrum. Specimens tested to this spectrum sustained 9 blocks to failure in a low-high sequence, 26 blocks in a high-low sequence, and 20 blocks in a high-low-high-sequence. Corresponding life predictions are 10.9, 25.2, and 19.6 blocks to failure.
- Dates of Publication and/or Sequential Designation:
- Volume 1970, Issue 462 (January 1970)
- Subject(s):
- ISBN:
- 0803100329, 9780803100329, and 9780803145849 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 28.
- Other Forms:
- Also available in PDF edition., Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription., and Full text article also available for purchase.
- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1970. 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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