# Model: 3D Piston. Diesel Engine Piston Studies the deformation and distribution of stresses in a suggested design at steady-state conditions Applied piston.

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Model: 3D Piston

Diesel Engine Piston Studies the deformation and distribution of stresses in a suggested design at steady-state conditions Applied piston loads at steady-state analysis are: –Peak combustion pressure –Thermal loads –Inertia loads Calculates the stresses, which should be below the levels for fatigue of the material

Piston Geometry symmetry ¼ is modeled due to symmetry

Crown Top land Bowl Boundary Conditions - Mechanical The peak cylinder pressure is applied over the crown, combustion bowl and top land area.

No displacement in the normal direction No displacement in the normal direction Boundary Conditions – Mechanical Symmetry boundary constraints

Boundary Conditions – Mechanical The pin is assumed to be rigid Contact boundary conditions at the pin hole

Boundary Conditions – Thermal Combustion gas temperature T inf = 900 o C All other boundaries: Cooling water and oil temperature T inf = 80 o C Convective boundary conditions

Weak formulation for the mechanical part: Internal virtual strain energy Strong formulation for the heat transfer equation Domain Equations

Results - Temperature Distribution Highest temperatures at the crown and bowl area  Lowest fatigue limit

Results - Deformation The gas pressure causes a bending action over the pin The thermal loading causes an expansion

Results - von Mises Stresses Maximum effective stress at the pin boss area and at the bowl edge above the pin hole

Results A high tensile stress at the bowl edge causes fatigue cracks

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