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Assessment of the period to fatigue macrocrack initiation near stress concentrators by means of strain parameters
Author(s) -
Ostash O. P.,
Panasyuk V. V.,
Kostyk E. M.
Publication year - 1999
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 - 10.1046/j.1460-2695.1999.t01-1-00191.x
Subject(s) - concentrator , radius , materials science , stress (linguistics) , displacement (psychology) , strain (injury) , structural engineering , composite material , constant (computer programming) , optics , engineering , physics , computer science , medicine , psychology , linguistics , philosophy , computer security , psychotherapist , programming language
A new approach to the experimental assessment of the local strain at a stress concentrator has been presented. It is based on a procedure of notch opening displacement measurements at certain points in the vicinity of a notch related to the effective notch radius ρ eff = ρ + d * , where ρ is the notch radius and d * is a material constant. Different stress concentrators in structural elements were modelled for a wide variation of notch radii ( ρ = 0.1–6.5 mm) and different geometries of specimens. Hence, a basic relationship, which directly relates the local strain range Δ ε* to the period of fatigue macrocrack initiation N i has been established. Thus, by applying the value of Δ ε* , assessed from a direct measurement at the notch root, it is possible to determine the period N i to initiate a fatigue macrocrack of length a i = d * for some structural components of complicated geometry.