Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy

Wojciech Macek; Ricardo Branco; José Domingos Costa; Cândida Pereira

doi:10.1016/j.mechmat.2021.103972

Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy

Abstract

The paper studies the effect of strain-loading sequence on fatigue lifetime and fracture surface topographies in 7075-T651 aluminum alloy specimens. Fatigue tests were performed in two ways: (i) constant-amplitude loading and (ii) two series of variable amplitude loading with non-zero mean strain values. The topography of the fatigue fractures was measured over their entire surfaces with the help of an optical confocal measurement system. The results of fatigue tests in the form of equivalent strains, εaeq, such as the weighted mean of strain components, εa1, εa2, and fatigue life, Nf, were used as the sum of the partial number of cycles N1, and N2. This study indicates, inter alia, that the values of the fracture surface parameter core height Sk, found in the two-step loading pro gram, are linearly dependent on the equivalent strain, and logarithmically dependent on the fatigue life.

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DOI:: Digital Object Identifier (open in new tab) 10.1016/j.mechmat.2021.103972
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Category:: Articles
Type:: artykuły w czasopismach
Published in:: MECHANICS OF MATERIALS no. 160,
ISSN: 0167-6636
Language:: English
Publication year:: 2021
Bibliographic description:: Macek W., Branco R., Costa J. D., Pereira C.: Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy// MECHANICS OF MATERIALS -Vol. 160, (2021), s.103972-
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.mechmat.2021.103972
Verified by:: Gdańsk University of Technology