Study of Fretting Fatigue Behavior of Cylinder head Aluminum Alloy, with and without nano-Clay-Particles

Document Type : Research Article

Authors

1 Semnan University

2 سمنان-مهندسی مکانیک

Abstract

Fretting fatigue occurs when contact stresses cause cracks to form and continue to grow between two objects or surfaces in contact. By considering frictional fretting and cyclic mechanical loads, the phenomenon of fretting fatigue can occur in vehicle engine parts. The presence of cyclic loads and the presence of fretting in the engine cylinder head increase the probability of the fretting fatigue phenomenon. In this study, the effect of lubrication and the fretting force value on the fretting fatigue behavior of the aluminum alloy used in the cylinder head has been investigated. The results were also obtained to compare samples with and without nano-particles. In addition, microstructure and fracture surface were examined by optical microscopy and field emission scanning electron microscopy. The results showed that lubrication could reduce the fretting damage. Moreover, increasing the fretting force decreased the fatigue lifetime of the sample with nano-particles. According to the results obtained from the tests, the effect of nano-particle amplification on the aluminum alloy with and without lubrication and at the fretting force equal to 15 N, increased the fatigue lifetime by about 50 times.

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Main Subjects


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