Effect of viscosity stress on the low cycle fatigue of the cylinder head

Document Type : Research Article

Author

Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

Abstract

Loading conditions and complex geometry have led the cylinder head to become the most challenging parts engine. One of the most important durability problems in engine is due to the cracks valves bridge area. Thus, simulation and analysis of fatigue cracks is essential. In this paper, low cycle fatigue (LCF) life analysis of the cylinder head is performed by using finite element method and ANSYS software to predict the temperature and stresses and then LCF life by using Morrow theory and nCode Design Life software. Mechanical properties of aluminum-silicon-magnesium alloy obtained by LCF tests at different temperatures. The combination of Chaboche nonlinear isotropic-kinematic hardening model with viscous stress law is used in order to considering the effect of stress viscosity. LCF tests were simulated by ANSYS software, and very good agreement was shown between the experimental and simulation results of LCF tests. The results of finite element analysis showed that the maximum temperature and stress values in the cylinder head are 205.67°C and 83.958MPa. According to the fatigue life analysis results, neglecting the stress viscosity effect caused an estimation of 105 cycles or about 5.9% higher than the limit. Therefore, it is necessary to consider the stress viscosity effect in the analysis of the low cycle fatigue life of the cylinder head.

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 8
In Progress
November 2025
Pages 1-1

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