ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The objective of this study is to evaluate the effect of stress relief groove on frettingfatigue strength. Fretting fatigue tests and finite element analyses were done. The shape of groovewas controlled by groove radius R and tangential angle θ. The depth of groove was specified by Rand θ. Fretting fatigue strength was increased with an increase of θ and then it turned into adecrease. The decrease was caused by the transition of failure mode from fretting fatigue at thecontact part to plain fatigue at the groove root. The transition was caused by an increase of stressconcentration at the groove root with an increase of the groove depth. Therefore, the maximumimprovement of fatigue strength was achieved by the largest θ limited by fatigue strength of thegroove root. In the analysis, the groove generates high compressive stress field at the contact edge,where small cracks never propagate. Therefore, assumptions to relieve the contact pressureconcentration at the contact edge were taken into the analysis model. The values of stress intensityfactor ranges for small cracks introduced near the contact edge were almost the same betweengrooved and non-groove specimens
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.856.pdf
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