The mixed and fluid film lubrication characteristics of plain journal bearings with shape changed by wear are numerically\r\nexamined. A mixed lubrication model that employs both of the asperity-contact mechanism proposed by Greenwood and\r\nWilliamson and the average flow model proposed by Patir and Cheng includes the effects of adsorbed film and elastic deformation\r\nis applied. Considering roughness interaction, the effects of the dent depth and operating conditions on the loci of the journal\r\ncenter, the asperity-contact and hydrodynamic fluid pressures, friction, and leakage are discussed. The following conclusions\r\nare drawn. In the mixed lubrication regime, the dent of the bearing noticeably influences the contact and fluid pressures. For\r\nsmaller dents, the contact pressure and frictional coefficient reduce. In mixed and fluid film lubrication regimes, the pressure\r\nand coefficient increase for larger dents. Furthermore, as the dent increases and the Sommerfeld number decreases, the flow rate\r\ncontinuously increases.
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