A STUDY OF CUMULATIVE FATIGUE DAMAGE UNDER VARIABLE LOADING-MODE CONDITIONS

Authors
Citation
W. Zhang et Kj. Miller, A STUDY OF CUMULATIVE FATIGUE DAMAGE UNDER VARIABLE LOADING-MODE CONDITIONS, Fatigue & fracture of engineering materials & structures, 19(2-3), 1996, pp. 229-239
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science","Engineering, Mechanical
ISSN journal
8756-758X
Volume
19
Issue
2-3
Year of publication
1996
Pages
229 - 239
Database
ISI
SICI code
8756-758X(1996)19:2-3<229:ASOCFD>2.0.ZU;2-6
Abstract
The accumulation of fatigue damage was investigated by studying deform ation processes and the kinetics of short crack initiation and propaga tion under variable loading-mode conditions. Fatigue tests were carrie d out under push-pull and torsion, both separately and sequentially, t hat is specimens were subjected to push-pull loading prior to torsion. The results show that specimens tested in push-pull followed by torsi on have a much longer fatigue life than virgin specimens. The mechanis ms of this phenomenon were explored by experimental observations and t heoretical analyses of crack initiation and propagation. The effect of stress state on cumulative damage is described in some detail.