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NOTCH ROOT CRACK CLOSURE UNDER CYCLIC INELASTICITY
Author(s) -
Sunder R.
Publication year - 1993
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.1460-2695.1993.tb00112.x
Subject(s) - striation , materials science , crack closure , hysteresis , composite material , cyclic stress , fracture (geology) , structural engineering , fractography , amplitude , stress (linguistics) , fracture mechanics , optics , condensed matter physics , engineering , physics , linguistics , philosophy
Aluminium alloy sheet coupons with a central hole were tested in fatigue under specially designed programmed load sequences. Electron microscopy of the fatigue fracture surfaces showed striation mode fatigue crack extension up to more than a millimeter before onset of rapid failure. Crack opening stress was determined from striation patterns. Under variable amplitude loading and conditions of notch root cyclic inelasticity, crack opening stress exhibits noticeable hysteresis. The hysteresis is attributed to a difference between crack closure and opening stresses. A linear model of this phenomenon appears to describe observed behaviour.