Nguyen Xuan Khoa
School of Mechanical and Automotive Engineering, Hanoi University of Industry, No. 298, Cau Dien Street, Tay Tuu Ward, Hanoi, 100000, Vietnam.

Nguyen Van Tuan
Mechanical Power Engineering and Automation Research Group, University of Transport Technology, Hanoi, 100000, Vietnam.

DOI https://doi.org/10.33889/IJMEMS.2026.11.5.079

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Abstract

Turbocharging is applied to internal combustion engines to improve power density and fuel economy, and is used broadly. This can be especially beneficial if used in conjunction with engine downsizing to enable efficient city driving while maintaining the necessary power output for highway speeds. These advantages come at a price, however; the mechanical loading imposed on the crankshaft-connecting rod assembly, which consequently impacts the durability of the crankshaft. The authors compared the stress state of the crankshaft of a turbocharged gasoline engine under two conditions, namely, naturally aspirated and turbocharged, to examine the effect of mechanical load on the operating conditions of the crankshaft. The authors used the engine model based on AVL-Boost software to generate pressures and dynamic loads to be used as boundary conditions for the 3D finite element model of the crankshaft. The study was performed at two operating modes, one for the maximum torque and the other for the maximum power with the boost pressure ratio of 1.5. The outcomes show that with turbocharging the equivalent stress of the crankshaft is higher and it reaches a maximum of 301.79 MPa at 4200 rpm. The high-stress areas were primarily concentrated at the transition zones between the crankpin and the crank web. The results of calculations indicated that the loads applied on the crankshaft of the turbocharged gasoline engine were still below the allowable loads for 40XHMA steel. These findings demonstrate that the original crankshaft design maintains sufficient durability under the investigated turbocharging conditions, while also providing a basis for future research into structural optimization and fatigue strength assessment.

Keywords- Turbocharged gasoline engine, Crankshaft, Strength verification, Finite element analysis.

Citation

Khoa, N. X. & Tuan, N. V (2026). Application of the Finite Element Method for Stress Evaluation of a Gasoline Engine Crankshaft under Turbocharged Conditions. International Journal of Mathematical, Engineering and Management Sciences, 11(5), 1986-2002. https://doi.org/10.33889/IJMEMS.2026.11.5.079.