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Ultrasonic fatigue testing device under biaxial bending

Article dans une revue avec comité de lecture
Article dans une revue avec comité de lecture
Author
ccBRUGGER, Charles
ccPALIN-LUC, Thierry
OSMOND, Pierre
7736 PSA Peugeot - Citroën [PSA]
BLANC, Michel
7736 PSA Peugeot - Citroën [PSA]

URI
http://hdl.handle.net/10985/17095
DOI
10.3221//IGF-ESIS.37.07
Date
2016
Journal
Frattura ed Integrità Strutturale

Abstract

A new fatigue testing device has been developed to test specimens under biaxial loading at 20 kHz. A flat smooth specimen with a disc geometry is placed on a torus frame and cyclically loaded at the center of its upper face. Disc bending generates a biaxial proportional stress state at the center of the lower face. Any positive loading ratio can be applied. A cast aluminum alloy (used to produce cylinder heads) has been tested under biaxial bending using this device in order to determine its fatigue strength at 109 cycles under high hydrostatic pressure. Self-heating is moderate but macroscopic fatigue cracks after testing are very long. First results in VHCF regime are consistent with literature results obtained under similar stress state but in HCF regime and at 20 Hz.

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