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A MODIFIED FRACTURE MECHANICS APPROACH TO METAL FATIGUE

1992; Wiley; Volume: 15; Issue: 10 Linguagem: Inglês

10.1111/j.1460-2695.1992.tb00026.x

8756-758X

D.L. DuQuesnay, H. Abdel‐Raouf, T. H. Topper, A. Plumtree,

Non-Destructive Testing Techniques

Abstract 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.