Fida Hussain Jamali,Saifullah Samo,Intizar Ali Tunio,Abdul Fatah Abbasi,Qadir Bakhsh Jamali,




Dynamics Analysis,Engine Crankshaft,Finite Element Analysis,Fatigue Life,Stress Distribution,Deformation Distribution,


For many years, engines have been one of the main power machinery of different kinds of applications, and the main part of power machinery is a crankshaft that converts the piston's reciprocating displacement with four-link mechanisms into rotary motion. . The major limitation of the engine crankshaft is fatigue failure due to repeated load caused by bending and torsional load. In this paper, the comparative dynamics structural analysis was carried out for three different materials such as forged steel, cast iron, and chromium-molybdenum steel with different angles of turns of cranks from 0° to 720° and to predict the stresses, deformation, and fatigue life of crankshaft without compromising its weight, strength and reliability. The 3D CAD model was simulated with FEA software. The simulated results show that by applying bending load and torsional load for three materials, the maximum stresses produced in the fillet area of the main bearing journal and in the fillet area of the crankpin journal at a crank angle of 360° respectively. The deformation results revealed that maximum deformation occurs at the mid-surface of the crankpin. From fatigue life prediction it was observed that forged steel and chromium-molybdenum steel shows better fatigue life as compared to cast iron. Moreover, in the comparative study, it was concluded that chromium-molybdenum steel shows fewer stresses and better fatigue life. Therefore it is suggested that chromium-molybdenum steel would be the better option for manufacturing crankshaft.


I. Aldhaidhawi Mohanad, Muneer Naji, Abdel Nasser Ahmed. : EFFECT OF IGNITION TIMINGS ON THE SI ENGINE PERFORMANCE AND EMISSIONS FUELED WITH GASOLINE, ETHANOL AND LPG, J. Mech. Cont.& Math. Sci., Vol.-15, No.-6, June (2020) pp 390-401
II. Degefe, M., P. Paramasivam, and T. Dabasa, “Optimization and Finite Element Analysis of Single Cylinder Engine Crankshaft for Improving Fatigue Life”. American Journal of Mechanical and Materials Engineering, 2017. 1(3): p. 58-68.
II. Fonte, M., et al., Failure mode analysis of two crankshafts of a single cylinder diesel engine. Engineering Failure Analysis, 2015. 56: p. 185-193.
III. Gopal, G.; Kumar, L. S.; Reddy, K. V. B.; Rao, M. U. M. and Srinivasulu, G. Analysis of Piston, Connecting Rod and Crank Shaft Assembly. Materials Today: Proceedings 2017, 4, 7810-7819.

IV. Horváth, P. and Égert, J. Stress Analysis and Weight Reduction of a One-Cylinder Engine Crankshaft. Acta Technica Jaurinensis 2015, 8, 201-217.
V. Metkar, R.M., et al., “Evaluation of FEM based fracture mechanics technique to estimate life of an automotive forged steel crankshaft of a single cylinder diesel engine”. Procedia Engineering, 2013. 51: p. 567-572.
VI. Montazersadgh, F.H. and A. Fatemi, Dynamic load and stress analysis of a crankshaft. 2007, SAE Technical Paper.
VII. Pratiksha M. Nargolkar. “Analysis of Crankshaft”. International Journal of Scientific Engineering and Research, 2015.p.122-127.
VIII. R. Jagadeesh Kumar, K. Phaniteja, K. Sambasiva Rao. “Transient Structural Analysis Of A Single Cylinder 4 Stroke Petrol Engine Crankshaft,” international journal of advanced technology in engineering and science., 2017 vol .5, pp 559-612.
IX. Sandya, K.; Keerthi, M. and Srinivas, K. Modeling and Stress Analysis of Crankshaft Using Fem Package Ansys. International Research Journal of Engineering and Technology IRJET 2016, 3, 687-693.
X. Saurabh P. Jangam, Satish Kumar, Shruti Maheshwari.” Literature review on analysis of various components of IC engine”. Materials Today: Proceedings,2018.:p. 19027–19033.
XI. Thejasree, P., G.D. Kumar, and S.L.P. Lakshmi, “Modelling and Analysis of Crankshaft for passenger car using ANSYS”. Materials Today: Proceedings, 2017. 4(10): p. 11292-11299.
XII. Witek, L.; Sikora, M.; Stachowicz, F. and Trzepiecinski, T. Stress and Failure Analysis of the Crankshaft of Diesel Engine. Engineering Failure Analysis 2017, 82, 703-712.
XIII. Williams, J.R., F. Montazersadgh, and A. Fatemi, Fatigue Performance Comparison and Life Predictions of Forged Steel and Ductile Cast Iron Crankshafts. 2007, University of Toledo.

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