An O-ring is a mechanical gasket in the shape of a torus designed to be seated in a groove. It is used to create a seal at the interface. The model consists of three axisymmetric parts: piston, housing and o-ring. The o-ring sits inside the gland, cut into the piston. This is a challenging problems as it involves multiple nonlinearities: material nonlinearity, geometric nonlinearity and contact between multiple components. As the geometries and loads are axisymmetric, the problem is analyzed using an axisymmetric model.
The analysis of the o-ring is performed in three steps. In the first step, interference is resolved and in the second step housing is moved upwards. In the third step, a fluid pressure is applied. Simulation of the o-ring shows that it rolls inside the gland instead of sliding which effects its life.
Note: This exercise is part of the Solving Non-linear Problems with Abaqus course.