Effect Of Casting Defects And Roller Burnishing
On Fatigue Properties Of A Cast Aluminum Alloy
AC4CH
Author(s)
Y. Nakamura, H. Masuda, T. Shimizu, M. Nakajima
& Y. Uematsu
Abstract
In order to clarify the effect of casting defects on the high cycle fatigue
properties, rotary bending fatigue tests were carried out on a cast aluminum
alloy, JIS AC4CH, with two different levels of defect size. As a result of fatigue
tests, the fatigue strength decreased with increasing the defect size. The
fatigue limits were estimated by the area parameter model and compared with
experimental values. The maximum defect size evaluated by the extreme value
statistics was used in the prediction. The predicted values of fatigue limits for
specimens with the different defect sizes were not in good agreement with the
experimental values. In addition, the effects of the roller burnishing process on
surface conditions and fatigue properties were also investigated. Vickers’
hardness and compressive residual stress on the specimen surface were increased
by the burnishing process. An improvement of fatigue property was found in the
burnished specimen. It is due to the disappearance of casting defect on the
specimen surface, and increase of hardness and compressive residual stress.
Keywords: fatigue, cast aluminium alloy, casting defect, roller burnishing,
statistics of extreme value.
Keywords
Keywords: fatigue, cast aluminium alloy, casting defect, roller burnishing,
statistics of extreme value.
Related Book
Other papers in this volume
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