Abstract
In the field of internal combustion engines, diesel engines have the advantage of a high thermal efficiency and of operating on cheap fuels of high calorific value. To maintain these advantages brake mean effective pressures (b.m.e.p.) are continually being increased, but limitations are imposed by the cylinder head and the piston design. Usually such problems are overcome by development testing. However, these methods give little fundamental understanding of the stress distributions and how they vary under different load and temperature conditions. In this work a method for predicting pressure and steady-state thermal stresses in pistons, of different materials, for medium speed diesel engines is discussed. The pressure is applied to simulate the engine peak pressure loading and the temperature represents the time average temperature distribution in the piston under engine running conditions. The induced stresses and strains are calculated numerically.
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