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THE EMISSION OF RAYLEIGH WAVES FROM BRITTLE FRACTURE INITIATION, AND THE POSSIBLE EFFECT OF THE REFLECTED WAVES ON CRACK ARREST
Author(s) -
Thaulow C.,
Burget W.
Publication year - 1990
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.1460-2695.1990.tb00605.x
Subject(s) - rayleigh wave , acoustic emission , materials science , crack closure , stress wave , rayleigh scattering , brittleness , fracture mechanics , structural engineering , mechanics , acoustics , composite material , optics , surface wave , engineering , physics
— The pop‐in initiation and arrest behaviour in weldments of a structural steel, have been characterized with acoustic emission measurements. It was found that strong Rayleigh waves radiate from the crack tip in a preferred direction. Literature examinations and reanalysis of previous crack arrest test results, clearly indicate that the Rayleigh waves will be reflected back from edges on the crack surface and cause a crack closure effect upon arrival at the running crack tip. The phenomenon is tentatively called AUTOARREST (automatic arrest caused by release of stress waves from the crack itself).