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

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Ashouri Hojjat

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Journal Paper

Paper Information

Journal: JOURNAL OF MECHANICAL ENGINEERING AMIRKABIR (AMIRKABIR) Year:2024 | Volume:56 | Issue:9 Page(s): 1053-1074

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Information Journal Paper

Title

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

Author(s)

Ashouri Hojjat | Issue Writer Certificate

Keywords

Cylinder head

Finite element analysis

Low cycle Fatigue

Viscosity stress

Abstract

Loading conditions and complex geometry have led the Cylinder head to become the most challenging component in the engine. The cracks in valves in bridge areas are one of the vital durability problems in engines, showing the necessity of the simulation and analysis of fatigue cracks. The present study used the finite element method to analyze the Low cycle Fatigue (LCF) life. The ANSYS software was also used to predict the temperature, stresses, and LCF life through Morrow theory and nCode Design Life software. The LCF tests were conducted at different temperatures to obtain the mechanical properties of aluminum-silicon-magnesium alloy. The combination of the Chaboche nonlinear isotropic-kinematic hardening model with viscous stress law was used to consider the effect of stress viscosity. LCF tests were simulated by ANSYS software, showing a very good fit between the experimental and simulation results of LCF tests. The results of Finite element analysis suggested that the maximum temperature and stress values in the Cylinder head were 205.67°C and 83.958MPa. According to the fatigue life analysis results, neglecting the stress viscosity effect led to estimating 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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