Variations on a critical distance theme. (November 2021)

• Record Type: Journal Article
• Authors: Navarro, A.; Chaves, V.; Balbín, J.A.
• Is Part Of: International journal of fatigue. Volume 152(2021)
• Publication Date: 2021-11
• Subjects: Notch -- Notched fatigue strength -- Notched fatigue limit -- Critical distance -- Plasticity correction; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2021.106453
• Languages: English
• ISSNs: 0142-1123

Abstract

Abstract: We investigate how the fatigue limit of notched specimens calculated with the Theory of Critical Distance (TCD) changes when variations in the value of the critical distance itself are considered. We motivate our study by showing how attempts at introducing a plastic zone correction in the derivation of the formula for the critical distance lead to a new length which can be significantly larger than the original one. The predictions effected with both lengths were not found to be so different, though. And this led us to study circular holes and V-notches, for which solutions for the ratio K f ∕ K t can be derived analytically. Highlights: Studies sensitivity of TCD predictions to changes in critical length. Motivated by attempt at introducing plastic zone correction in TCD formula. Derive alternative formula that yields larger characteristic length. Calculations with the two different lengths render similar notched strengths.