سؤدد نوري غني الدجيلي

Experimental investigation is performed to simulate the steel rod corrosion into the machinery parts after used and exposure to different corrosive medias. Five samples of carbon steel used in this study and it is submerged into three types of water medias (pure water, drainage water , and sulfuric spring water) with periods ( 3, 6, 12, and 24 Weeks). It was concluded that the values of the corrosion rate at low exposure time (t=3 Weeks) are greater than that for long exposure with the fact that the weight loss of carbon steel increased with time. In addition to, it was found that corrosion rates of these products vary in the different corroding media the steel rods into pure water media has a higher corrosion resistivity than that it submerged into a drainage water media and a sulfuric spring water media , and that the samples into a drainage water media has a higher corrosion resistivity than that into the sulfuric spring water media. Also the rod samples with high percent carbon essentially corroded more than that it has low percent of carbon samples at the same environments.

This paper investigates the effect of bearing shell elastic deformation on the steady state behavior of misaligned journal bearings. Performance trends of elastic and rigid bearings with different degree of misalignment (Dm) have been compared. Bearing shell elastic deformation, thermal effects, pressure and temperature variation for a bearing working under turbulent lubrication have been taken into consideration. It is found that misaligned bearings working at higher misalignment coefficients have higher load carrying capacity since the oil film thickness approaches to zero in this case. Considering the effect of bearing shell elastic deformation with the effect of oil film temperature causes lower values of bearing load. Some of the results obtained in this paper have been compared with that published by other workers and found to be in a good agreement.

An investigation to the turbulent lubrication performance of journal bearing considering journal misalignment and bearing elastic deformation has been established and validated through this work. Oil film pressure, side leakage flow rate, friction coefficient and misalignment moments at variant journal misalignment and bearing elastic deformation are calculated based on the modified Reynolds equation to include the effect of turbulent flow of oil due to high speeds of journal .Suitable models for journal misalignment and bearing elastic deformation have been used and included to the oil film thickness. Some of the results obtaind through this work have been compared with that obtained by the other workers and found to be in agood agreemnt. It has been shown that the combined effect of the bearing shell elastic deformation and the journal misalignment has a considerable effect on the bearing parametres and can not be neglected.