Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 100, Issue -, Pages 602-610Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.12.028
Keywords
Crack initiation; Crack path; Cylindrical contact; Fretting; Multiaxial fatigue
Funding
- Ministerio de Economia y Competitividad [DPI2014-59160-P]
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The initial crack path is analysed in a series of fretting fatigue tests with cylindrical contact. In such tests, both specimens and pads are made of A17075-T651 alloy and a non-proportional multiaxial stress state with a significant stress gradient is present. The crack initiation path along the fracture surface is optically measured using a focus variation technique. The contact stress/strain fields analytically obtained, in conjunction with either the Fatemi-Socie (FS) or Smith-Watson-Topper (SWT) multiaxial fatigue parameters, allow us to determine the controlling parameters of the crack initiation process observed in the tests, and to estimate the crack path during the early stage of the crack growth. These estimations are compared with the experimental results. Finally, a fracture mechanics approach is also employed where the crack paths measured are compared with the stress intensity factor (SIF) of cracks with different lengths and orientations showing also good results. (C) 2016 Elsevier Ltd. All rights reserved.
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