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Stress Analysis on Cylinder Head of Four Stroke Variable Compression Ratio Diesel Engine

Dokku Srinivasarao, M.Amareswari Reddy, M.N.V. Krishna Veni, P.Chandr Sekhar, M.Rama Krishna, K. Satyanarayana

Abstract


The main objective of this work is to envisage the design performance based on the stress/strain and behavior of cylinder head under diverse operating conditions. The effects of engine operating conditions such as combustion gas maximum internal pressure and temperature on the cylinder head have been analyzed.  The maximum gas pressure vs crank angle are taken from the experimental set up of a variable compression ratio (VCR) Diesel engine. The analysis was carried out at compression ratio 18.5 using a finite element analysis (FEA). which is use to simulate and predict the Von-Mises stresses and strain pattern and thermal distribution of the cylinder head structure .The geometrical modeling was carried out using  CATIA and analysis is done on  ANSYS. In this investigation, structural and thermal analysis of the cylinder head highlights several areas of interest. The maximum stress is found not more than the material strength of cylinder head, and therefore the basic design criteria, i.e. no yielding and no structural failure under firing load case are satisfied. This steady-state finite element method (FEM) stress analysis can play a very efficient role in the speedy prototyping of the cylinder head. We have done analysis on five different materials. The results of the thermo-mechanical analysis show that when the engine is running, the stress in the region is compressive, caused by thermal loading and combustion pressure. The fatigue analysis is carried out to know the factor of safety and life of the cylinder head it indicates maximum life of 1x106 cycles at compression ratio 18.5 is determined through finite element analysis. 


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