NDLI: Modeling of Fatigue Slip Bands and Application to Notch Fatigue Problems

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Matsuno, Hiroshi
Copyright Year	2008
Abstract	In the present paper, equivalent stress ratios (REQ-ratios), which have been proposed as parameters for correspondence between cyclic stress conditions of notched and unnotched specimens, are reviewed. The REQ-ratios are formulated based on a concept of plastic adaptation hypothesized for a fatigue slip band from a viewpoint of macro-mechanics. A method for diagramming fatigue strength of metals based on the parameter of the REQ-ratios is newly proposed. The method diagramming together the fatigue strength of notched and unnotched specimens is applied not only to fatigue problems of usually annealed, normalized and heat-treated materials but also to those of severely heat-treated and surface-treated ones. Fatigue strength diagrams are characterized with two types of fatigue strength: σw1 and σw2. The character of σw2 appears not only in specimens with sharp notches but also in unnotched specimens fatigue-tested at lower RN-ratios. Criteria on fatigue strength σw1 and σw2 are derived from the fatigue strength diagrams and formulated as empirical equations. Characteristics of fatigue slip bands are reviewed and two types of fatigue mechanisms are proposed related with fatigue strength σw1 and σw2 from a viewpoint of micro-mechanics. Consequently, it is found that the hypothesis of plastic adaptation is a very useful and fundamental idea for modeling a fatigue slip band and also for analyzing fatigue data of practical metals and alloys.
Starting Page	305
Ending Page	314
Page Count	10
File Format	PDF
ISBN	9780791848654
DOI	10.1115/IMECE2008-66542
e-ISBN	9780791838402
Volume Number	Volume 4: Design and Manufacturing
Conference Proceedings	ASME 2008 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2008-10-31
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Fatigue mechanism Fatigue strength σw2 Hypothesis of plastic adaptation Equivalent stress ratio Fatigue strength σw1 Fatigue slip band Fatigue strength diagram Fatigue Fatigue strength Modeling Stress
Content Type	Text
Resource Type	Article

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