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Calculation of the energy J‐integral in plastic zone ahead of a crack tip by infrared scanning
Author(s) -
Iziumova A.,
Plekhov O.
Publication year - 2014
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/ffe.12202
Subject(s) - dissipation , work (physics) , materials science , infrared , j integral , fracture mechanics , crack closure , mechanics , fatigue testing , heat equation , structural engineering , composite material , mathematical analysis , mathematics , physics , thermodynamics , engineering , optics
The work is devoted to the experimental study of the energy dissipation in titanium OT‐4 under fatigue crack propagation. To investigate a spatial and time temperature evolution at fatigue crack tip, a set of experiments was carried out using specimens with pre‐grown centered fatigue crack. The temperature evolution was monitored by infrared camera. To estimate the values of heat dissipation and J‐integral for cracks with the pronounced plastic zone, an original mathematical algorithm for experimental data treatment was developed. The algorithm includes spatial‐time filtering and relative motion compensation procedures. The value of J‐integral was calculated using the HRR‐solution for stress distribution near the fatigue crack tip and an approximate equation relating the J‐integral to the value of the plastic work.