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- Title
Effects of cyclic frequency and contact pressure on fretting fatigue under two-level block loading.
- Authors
Iyer; Mall
- Abstract
Fretting fatigue tests involving the contact of flat and cylindrical titanium alloy Ti–6Al–4V surfaces, and constant- and two-level block remote bulk stresses are described. The constant-amplitude tests have been performed at cyclic frequencies of 1 and 200 Hz. The two-level block spectra involve the superposition of a 1-Hz, low-cycle fatigue (LCF) constant-amplitude component and a 200-Hz, high-cycle fatigue (HCF) component. Two values of contact pressure are considered. The cyclic frequency of 200 Hz is found to curtail the constant-amplitude fretting fatigue life regardless of the contact pressure applied. Increasing the contact pressure reduces life at 1 Hz but does not have any effect at 200 Hz. Under two-level block loading, the fretting fatigue life is determined primarily by the stress amplitude and high-cyclic frequency of the HCF component of the load spectrum. The LCF component is found to play a secondary role in the determination of the two-level block fretting fatigue life. Fracture topographies for the different test conditions are documented.
- Subjects
TITANIUM alloy fatigue; METAL fatigue; STRAINS &; stresses (Mechanics); METAL fractures; SCIENTIFIC experimentation
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2000, Vol 23, Issue 4, p335
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1046/j.1460-2695.2000.00288.x