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

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Abstract

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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Most cited references 2

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Minimum Circumscribed Ellipse (MCE) and Stress Scale Factor (SSF) criteria for multiaxial fatigue life assessment

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Very high cycle fatigue measuring techniques

S. Tschegg (2014)

Author and article information

Affiliations
[1] Universidade de Lisboa,Portugal
Journal
Frattura ed Integrità Strutturale
Gruppo Italiano Frattura
01 July 2016
: 10
: 37
: 131-137

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Categories
Technology
T
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
Materials of engineering and construction. Mechanics of materials
TA401-492
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