Development of a Very High Cycle Fatigue (VHCF) multiaxial testing device

The very high cycle region of the S-N fatigue curve has been the subject of intensive research on the last years, with special focus on axial, bending, torsional and fretting fatigue tests. Very high cycle fatigue can be achieved using ultrasonic exciters which allow for frequency testing of up to 3...

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Bibliographic Details
Published inFrattura ed integritá strutturale Vol. 10; no. 37; pp. 131 - 137
Main Authors Vieira, M, Freitas, M de, Reis, L, R Ribeiro, A M
Format Journal Article
LanguageEnglish
Published Cassino Gruppo Italiano Frattura 01.07.2016
Subjects
Analysis
Bending fatigue
Devices
Fatigue (materials)
Fatigue testing
Fatigue testing machines
Fatigue tests
High cycle fatigue
Horns
Machinery
Metal fatigue
Multiaxial fatigue
Piezoelectricity
Strain measurements
Testing
Ultrasonic technology
Very high cycle fatigue
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Summary:The very high cycle region of the S-N fatigue curve has been the subject of intensive research on the last years, with special focus on axial, bending, torsional and fretting fatigue tests. Very high cycle fatigue can be achieved using ultrasonic exciters which allow for frequency testing of up to 30 kHz. Still, the multiaxial fatigue analysis is not yet developed for this type of fatigue analyses, mainly due to conceptual limitations of these testing devices. In this paper, a device designed to produce biaxial fatigue testing using a single piezoelectric axial exciter is presented, as well as the preliminary testing of this device. The device is comprised of a horn and a specimen, which are both attached to the piezoelectric exciter. The steps taken towards the final geometry of the device are presented. Preliminary experimental testing of the developed device is made using thermographic imaging, strain measurements and vibration speeds and indicates good behaviour of the tested specimen.
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ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.37.18