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On the use of the peak stress method to assess the linear elastic and the fatigue notch factors of notched components under tension
Author(s) -
Meneghetti G.,
Zappalorto M.
Publication year - 2017
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12613
Subject(s) - finite element method , tension (geology) , radius , structural engineering , stress (linguistics) , stress concentration , constant (computer programming) , materials science , compact tension specimen , welding , simple (philosophy) , mathematical analysis , mathematics , mechanics , composite material , fracture mechanics , engineering , ultimate tensile strength , physics , crack closure , computer science , crack growth resistance curve , linguistics , philosophy , computer security , epistemology , programming language
A simple method is proposed, which allows the theoretical stress concentration factor at a rounded notch tip to be assessed from the fictitious stress value arising at the tip of the corresponding pointed V‐notch. Such a stress value suffices to be determined by a finite element analysis carried out using a mesh pattern with a constant average element size, d, strictly related to the actual root radius, ρ, and the opening angle, 2α, of the radiused notch. The relevant expression linking d to ρ and 2α is obtained in closed form and the accuracy of the proposed method is discussed versus the results of a number of finite element analyses carried out on notched plates under tension. Eventually, the possibility of using the peak stress directly as a strength parameter is explored, and an example related to the fatigue strength of welded joints is provided to support this idea.