The Response Surface Methodology (RSM) based on D-optimal design was employed to investigate the tribological characteristics of journal bearing materials such as brass, bronze and copper lubricated by a biolubricant, Chemically Modified Rapeseed Oil (CMRO). The wear and friction performances were observed for the bearing materials tested with TiO 2 , WS 2 and CuO nano additives dispersed in the CMRO. The tests were performed by selecting sliding speed and load as numerical factor, and nano based biolubricant/bearing materials as the categorical factor to evaluate the tribological characteristics such as coefficient of friction (COF) and specific wear rate. The results showed that RSM based on D-optimal design was instrumental in the selection of suitable journal bearing materials for a typical system especially lubricated by nano based biolubricant. At a sliding speed of 2.0 m/s, load of 100 N, the bronze bearing material with Downloaded by [University of Sussex Library] at 06:53 12 August 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 CMRO containing CuO nanoparticles give lowest COF and wear rate. In addition, ScanningElectron Microscopy (SEM) examination of the worn bearing surfaces showed that the bronze bearing material lubricated with CMRO containing CuO nanoadditive is smoother than copper/brass bearing material.
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