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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
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.