Modeling of Three-Dimensional Effects on Fatigue Crack Closure Processes in Small-Scale Yielding / RH. Dodds, S. Roychowdhury
- Conference Author
- Fatigue and Fracture Mechanics, 34th Volume (34th : 2003 : Tampa, Florida)
- Physical Description
- 1 online resource (19 pages) : illustrations, figures, tables
- Additional Creators
- Roychowdhury, S., Dodds, RH., American Society for Testing and Materials, and ASTM International
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- In ductile metals, plasticity-induced closure of fatigue cracks often retards significantly measured crack growth rates in the Paris regime and contributes strongly to the observed R-ratio effect in experimental data. This work describes a similarity scaling relationship based on the 3D small-scale yielding framework wherein the thickness, B, defines the only geometric length-scale of the model. Dimensional analysis suggests a scaling relationship for the crack opening loads relative to the maximum cyclic loads (Kop/Kmax) governed by the non-dimensional load parameter ¿̐ưK=Kmax/?0 ?B, i.e., a measure of the in-plane plastic zone size normalized by the thickness. Both Kop and Kmax refer to remotely applied values of the mode I stress-intensity factor. Large-scale, 3D finite element analyses described here demonstrate that Kop/Kmax values vary strongly across the crack front in thin sheets but remain unchanged when Kmax, B, and ?0 vary to maintain ¿̐ưK = constant. The paper also includes results to demonstrate that the scaling relationship holds for non-zero values of the T-stress (which affect the Kop/Kmax values) and for an overload interspersed in the otherwise constant amplitude cycles. The present results focus on R = Kmin/Kmax = 0 loading, although the scaling relationship has been demonstrated to hold for other R > 0 loadings as well. The new similarity scaling relationship makes possible more realistic estimates of crack closure loads for a very wide range of practical conditions from just a few analyses of the type described here.
- Dates of Publication and/or Sequential Designation
- Volume 2005, Issue 1461 (January 2005)
- Subject(s)
- Other Subject(s)
- ISBN
- 9780803155053 (e-ISBN)
9780803124103
0803124104 - Digital File Characteristics
- text file PDF
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- Includes bibliographical references 36.
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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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- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2005. 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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