https://matjournals.in/index.php/JOMME/issue/feedJournal of Mechanical and Mechanics Engineering2019-06-26T08:37:44+0530Mr Chandan Raicontact@matjournals.comOpen Journal Systemshttps://matjournals.in/index.php/JOMME/article/view/3908Simulation of finite element model of surface pit on f304 stainless steel2019-06-26T08:35:03+0530Mr. Surinder PalSurinder92.pal@gmail.com<p>The present study is directed on the FEA simulation of the hemispherical pits of F304 Stainless steel using Abaqus 6.14. The three-dimensional modeling of hemispherical pits was created at different diameters. The applied load was 60%, 75% and 90% of the yield stress of F304 stainless steel. Thus five hemispherical pits were created in the center of the rectangular plate at different depths and diameters. This study exhibited the diameter elongation of pits, von Mises stresses, and Max principal stresses. Furthermore, the reported results herein should be appropriate for the uncertainty of damage and elongations of pits and of degrading the material strength for f304 stainless steel at different applied loads. The sub modeling techniques have been employed to compare the simulated results with analytical results. Consequently, the results of this study suggest the critical regions of maximum stress concentration for various types of pits mainly around the pit surface, including depth and diameters.</p>2019-06-01T09:27:34+0530Copyright (c) 2019 Journal of Mechanical and Mechanics Engineeringhttps://matjournals.in/index.php/JOMME/article/view/3901Emission and Performance Study of Diesel Engine Fuelled with Preheated Biodiesel from Exhaust Waste Energy2019-06-26T08:37:44+0530Mr. M. Mouradm.mourad@mu.edu.egMr. El_Sadek Noureldeendr_elsadekhn2000@mu.edu.egThe need for alternative fuel instead of conventional fossil fuels (diesel or gasoline) has recently increased for several reasons, including the expected shortage of petroleum fossil fuels and the production of pollution by transportation. Consequently, researchers are interested in finding new alternative fuels. At present, the number of studies on biodiesel as a compression ignition engine fuel has increased. Current studies are mainly concerned with studying the use of exhaust gas temperature to preheat biodiesel fuel before it enters the combustion chamber. A heat exchanger is designed to increase the temperature of the biodiesel fuel prior to the combustion process. The performance characteristics of diesel engines and the emission of pollutants resulting from this modification were investigated under different operating conditions, including different engine loads and speeds. The results showed clear improvements in engine performance, including improved output power, specific fuel consumption and pollutant emissions. The engine power and specific fuel consumption improvements as a result of preheating reached up to 1.3 % and 8.27 %, respectively. Pollutant emission also decreased obviously, with carbon monoxide and hydrocarbon emission decreases of 12.95 % and 12.85 %, respectively. However, the emission of nitrogen oxides increased by 4.39 %.2019-06-26T08:31:22+0530Copyright (c) 2019 Journal of Mechanical and Mechanics Engineering