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Local Strain Measurement for Prediction of Fatigue Macrocrack Initiation in Notched Specimens
Author(s) -
Ostash O. P.,
Chepil R. V.
Publication year - 2003
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1046/j.1475-1305.2003.00043.x
Subject(s) - displacement (psychology) , materials science , strain (injury) , structural engineering , experimental data , range (aeronautics) , mechanics , composite material , mathematics , engineering , physics , statistics , medicine , psychotherapist , psychology
On the basis of direct measurement of the opening displacement of the notch contour the procedure of the evaluation of local elastoplastic strains range, Δ ɛ *, is developed. The experimental values of Δ ɛ * are compared with the calculational data using known equations by Neuber, Glinka, etc. It is shown that for Δ ɛ * < 2% the experimental and calculational values are in good agreement but only in the case when the gradient of strains near the notch tip is taken into account. The proposed experimental method is used for the prediction of period N i to fatigue macrocrack initiation in specimens of a complicated shape.