Abstract
Most of the endurance tests regarding the strength of diesel engines are intended to examine whether the structural parts can stand more than 107 cycles of gas pressure stress through a long period continuous operation under a certain constant load.
However, the combustion chamber wall is particularly required to stand the combined fatigue strength for the repeated thermal stresses and repeated gas pressure stresses.
Therefore, an endurance test method for the strength of the diesel engine combustion chamber was studied.
And in order to ascertain a method of fatigue life estimation which becomes a basis of the above endurance test, a comparison was made between the results of the engine fatigue test of the cast iron-made piston and cylinder cover and the results of theoretical fatigue life estimation which is based upon a concept of the combined fatigue strength.
