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SURFACE FLAWS IN CYLINDRICAL SHAFTS UNDER ROTARY BENDING
Author(s) -
Carpinteri A,
Brighenti R,
Spagnoli A
Publication year - 1998
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 - 10.1046/j.1460-2695.1998.00120.x
Subject(s) - ellipse , bending , materials science , bending moment , structural engineering , stress intensity factor , bar (unit) , surface (topology) , geometry , neutral axis , position (finance) , point (geometry) , composite material , fracture mechanics , engineering , mathematics , physics , beam (structure) , meteorology , finance , economics
The propagation of a surface flaw in a cylindrical shaft subjected to rotary bending is analysed using a two‐parameter theoretical model. The stress‐intensity factor distribution along the crack front is numerically determined for any position of the flaw with respect to the bending moment axis. The crack front is assumed to present an elliptical‐arc shape with aspect ratio α = a / b ( a , b = ellipse semi‐axes), whereas the relative depth ξ of the deepest point on the front is equal to the ratio between the maximum crack depth, a , and the bar diameter, D . The results for rotary bending are compared to those for reversed cyclic bending.