Use of ¿̐ưMarker Blocks¿̐ư As An Aid in Quantitative Fractography in Full-Scale Aircraft Fatigue Testing : A Case Study / RV. Dainty
- Conference Author:
- Fractography of Ceramic and Metal Failures (1982 : Philadelphia, Pennsylvania)
- Physical Description:
- 1 online resource (24 pages) : illustrations, figures, tables
- Additional Creators:
- Dainty, RV., American Society for Testing and Materials, and ASTM International
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- Damage tolerant design criteria and the current use of random or flight-by-flight loading methods in the full-scale testing of aircraft structures have necessitated the development of new techniques for acquiring accurate fatigue crack growth information from fracture surface analysis. This paper describes a technique that utilized a 64-cycle constant-amplitude ¿̐ưmarker block¿̐ư, in an otherwise random load spectrum of 4469 cycles, to derive fatigue crack growth data from an aluminum alloy spar cap and two wing skin rivets. The presence of an undetected incipient crack in the spar cap, from a previous full-scale test, provided an opportunity of accounting for the entire random loading crack growth history in terms of the ¿̐ưmarker band¿̐ư spacings. It was possible to identify the marker bands in the scanning electron microscope at relatively short crack lengths of 2.6 mm for the spar cap and 0.5 mm for the rivets. A total of 89 of the 90 marker blocks applied in the test were accounted for on the spar cap fracture surface. Examination of the rivet fracture surfaces revealed 12 and 8 marker bands, respectively, over crack lengths of some 3 mm.
- Dates of Publication and/or Sequential Designation:
- Volume 1984, Issue 827 (January 1984)
- Other Subject(s):
- 9780803148963 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 15.
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- 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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- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1984. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
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- Mode of access: World Wide Web.
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- ASTM International PDF Purchase price USD25.
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