Notch sensitivity and defect sensitivity under fatigue loading : Two sides of the same medal

Notch sensitivity and defect sensitivity are two different aspects of the fatigue behavior of materials. This paper extends the Kitagawa diagram to blunt cracks (U-shaped notches) and presents the simple expression (a*/a(0)) exp 0.5 = K(t). In such an expression a(0) is the El-Haddad length paramete...

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Bibliographic Details
Published inInternational journal of fracture Vol. 107; no. 1; pp. L3 - L8
Main Authors ATZORI, Bruno, LAZZARIN, Paolo
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 2001
Subjects
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
Materials science
Physics
Treatment of materials and its effects on microstructure and properties
Notch sensitivity
Sensitivity
Stress distribution
U shape
Stress coefficient concentration
Crack depth
Fatigue strength
Materials properties
Mechanical properties
Fatigue limit
Fatigue loading
Defects
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ISSN0376-9429

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Summary:Notch sensitivity and defect sensitivity are two different aspects of the fatigue behavior of materials. This paper extends the Kitagawa diagram to blunt cracks (U-shaped notches) and presents the simple expression (a*/a(0)) exp 0.5 = K(t). In such an expression a(0) is the El-Haddad length parameter, and a* is a particular blunt crack depth corresponding to the intersection between the delta-K(th) and delta-sigma(0)/K(t) curves. The new expression provides an explicit bridging between the notch sensitivity and the sensitivity to defects. (Author)
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ISSN:0376-9429