Experimental Study on Regard to Stress and Strain in Operating Condition of Diesel Engine Cylinder Head

Abstract

The temperature and thermal stresses were examined on the fire surface of the gray cast iron cylinder head. The measurements were carried out by thermo-couple and strain gage during high temperature and high pressure in operating condition. The cylinder head temperature was predicted from the engine performance data that is the fuel consumption etc. in the result of the regression analysis. The calculated temperature was good accuracy for the measured temperature. The thermal stress was measured during the engine operating cycles by many improvements of the preparation and data analysis. The thermal load was bigger than the mechanical loads considerably. The compression plastic deformations were occurred on the fire surface by the large compression thermal stresses. As the result of the plastic deformations in engine stop and go cycles, the tensile stresses were observed on the valve bridge of the fire surface after the engine operation.