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On specimen design for size effect evaluation in ultrasonic gigacycle fatigue testing
Author(s) -
Paolino D. S.,
Tridello A.,
Chiandussi G.,
Rossetto M.
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.12149
Subject(s) - materials science , amplitude , stress (linguistics) , gaussian , structural engineering , strain gauge , finite element method , ultrasonic sensor , ultrasonic testing , mechanics , composite material , engineering , acoustics , physics , optics , philosophy , linguistics , quantum mechanics
ABSTRACT Literature datasets showed that gigacycle fatigue properties of materials may be affected by the specimen risk‐volume, i.e., the part of the specimen subjected to applied stress amplitudes above a prescribed percentage of the maximum applied stress amplitude. The paper proposes a Gaussian specimen shape able to attain large risk‐volumes for gigacycle fatigue tests, together with a general procedure for its design: wave propagation equations are analytically solved in order to obtain a specimen shape characterised by a uniform stress distribution on an extended length and, as a consequence, by a larger risk‐volume. The uniformity of the stress distribution in the Gaussian specimen is numerically verified through a finite element analysis and experimentally validated by means of strain gauge measurements.