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Optical analysis of crack tip stress fields: a comparative study
Author(s) -
PATTERSON E. A.,
OLDEN E. J.
Publication year - 2004
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.1460-2695.2004.00774.x
Subject(s) - photoelasticity , stress intensity factor , strain gauge , opacity , structural engineering , range (aeronautics) , stress (linguistics) , materials science , forensic engineering , fracture mechanics , engineering , optics , composite material , physics , solid mechanics , linguistics , philosophy
Four optical techniques for evaluating stress intensity factors in opaque specimens are described in outline, and compared for both an artificial crack and a fatigue crack. The results are compared to a standard solution for the geometry considered. All the techniques gave acceptable results over a range of stress levels and crack lengths. The methods of caustics and strain gauges were less good, whilst photoelasticity gave consistent results over a wide range of stress levels. Comments on the ease of application and the resource implications are also made in order to assist practitioners.