On specimen design for size effect evaluation in ultrasonic gigacycle fatigue testing

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 s...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2014-05, Vol.37 (5), p.570-579
Main Authors: Paolino, D. S., Tridello, A., Chiandussi, G., Rossetto, M.
Format: Article
Language:English
Subjects:
Amplitudes
Applied sciences
Design engineering
Exact sciences and technology
Fatigue
Fatigue life
Fatigue tests
Gaussian
Mathematical analysis
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Normal distribution
risk-volume
Stress analysis
Stress concentration
Stress distribution
Stresses
ultra-high-cycle fatigue
ultrasonic testing machine
very-high-cycle fatigue
wave propagation equations
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Summary: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.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12149