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FATIGUE CRACK GROWTH UNDER ULTRASONIC FATIGUE LOADING
Author(s) -
Ni J. G.
Publication year - 1997
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.1460-2695.1997.tb00398.x
Subject(s) - ultrasonic sensor , materials science , structural engineering , finite element method , displacement (psychology) , stress intensity factor , paris' law , stress (linguistics) , modal , fracture mechanics , vibration , stress concentration , modal analysis , acoustics , composite material , crack closure , engineering , psychology , linguistics , philosophy , physics , psychotherapist
— In this paper, a stress and modal analysis of an ultrasonic vibration system consisting of a notched specimen and one or two amplifying horns have been performed by using 3D finite element calculations. The stress intensity factors in ultrasonic fatigue crack propagation are evaluated by means of displacement and energy approaches. The particular advantages as well as limitations of the two approaches are briefly discussed. Two types of ultrasonic fatigue loading, with a different stress ratio, are exerted on the specimen. From a comparison of the results a conclusion is formed that the energy approach is more accurate; it also has a wide range of practicality in engineering industries.