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A MODIFIED FRACTURE MECHANICS APPROACH TO METAL FATIGUE
Author(s) -
DuQuesnay D. L.,
AbdelRaouf H.,
Topper T. H.,
Plumtree A.
Publication year - 1992
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/j.1460-2695.1992.tb00026.x
Subject(s) - materials science , stress intensity factor , fracture (geology) , crack closure , fracture mechanics , stress concentration , fatigue limit , aluminium alloy , structural engineering , aluminium , compact tension specimen , composite material , stress (linguistics) , upper and lower bounds , mechanics , crack growth resistance curve , mathematics , mathematical analysis , engineering , physics , linguistics , philosophy
The fatigue lives, the fatigue limit stress ranges and fatigue notch factors for metallic specimens can be predicted using a modified fracture mechanics model for short cracks based on the combination of solutions for the non‐uniform strains at the surface of a metal and the development of crack closure. The resulting local stress intensity factor exceeds that indicated by linear elastic fracture mechanics at short crack lengths. The model predicts a smooth and continuous variation of the fatigue notch factor with notch size between a lower bound of unity and an upper bound equal to the theoretical notch stress concentration factor. The model is verified using experimental data for a 2024‐T351 aluminium alloy for smooth and notched specimens tested at various stress ratios.