The subsurface stress field associated with three-dimensional fretting contacts is characterized fully. Particular emphasis is placed on the effect of this stress field on fretting fatigue crack initiation and propagation. The calculation relies on recent close-deform expressions for the subsurface stress field. Induced by circular stick/slip regions of contact. Assuming fatigue crack initiation is controlled by the effective stress in the von Mises yield criteria allows the effect of normal and tangential loads and the coefficient of friction on fatigue crack initiation to be predicted. It is shown that the effect of friction of the subsurface maximum shear of the classical Hertzian contact is slight. However, the coefficient of friction and tangential load have strong effect on the tensile stress at the edge of contact. These tensile stresses are consistent with fretting a fatigue cracks that lead to the multi-site damage of primary concern to the aging aircraft problem.
Fretting fatigue crack initiation: aging aircraft concerns
Reibverschleißbedingte Ermüdungsrißbildung: Bezug zur Alterung von Luftfahrzeugen
1994
7 Seiten, 15 Bilder, 13 Quellen
Aufsatz (Konferenz)
Englisch
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