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An energy‐based critical fatigue life prediction method for AL6061‐T6
Author(s) -
LETCHER T.,
SHEN M.H. H.,
SCOTTEMUAKPOR O.,
GEORGE T.,
CROSS C.
Publication year - 2012
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2011.01669.x
Subject(s) - energy (signal processing) , strain energy , strain (injury) , structural engineering , materials science , low cycle fatigue , hysteresis , monotonic function , fatigue testing , process (computing) , stress (linguistics) , strain energy density function , cyclic stress , fracture mechanics , reliability engineering , forensic engineering , composite material , computer science , engineering , mathematics , statistics , finite element method , mathematical analysis , physical therapy , physics , philosophy , quantum mechanics , operating system , linguistics , medicine
ABSTRACT An energy‐based critical fatigue life prediction method is developed and analysed. The original energy‐based fatigue life prediction theory states that the number of cycles to failure is estimated by dividing the total energy accumulated during a monotonic fracture by the strain energy per cycle. Because the accuracy of this concept is heavily dependent on the cyclic behaviour of the material, a precise understanding of the strain energy behaviour throughout each failure process is necessary. Examination of the stress and strain during fatigue tests shows that the cyclic strain energy behaviour is not perfectly stable as initially presumed. It was discovered that fatigue hysteresis energy always accumulates to the same amount of energy by the end of the stable energy region, which has led to a new ‘critical energy’ material property. Characterization of strain energy throughout the fatigue process has thus improved the understanding of an energy‐based fatigue life prediction method.