An x-ring, also called quad ring, is an elastomeric seal with four contact lips designed to be seated in a groove. The simulation model consists of three axisymmetric parts: piston, housing and x-ring. The x-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 is performed in four 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. In the fourth step fluid pressure is held constant for 1000 minutes and viscoelastic effects are considered.
Note: This exercise is part of the Solving Non-linear Problems with Abaqus course.