Example44 Frictional Contact (#2)

Item	Settings
Solver	Mechanical Stress Analysis [Galileo]
Analysis Type	Transient analysis
Large deformation	Select “Large displacement”.

The transient analysis is set up as follows.

Tabs

Setting Item

Settings

Transient analysis

Table

Number	Calculation steps	Output steps	Time step [s]
1	60	1	0.25×10^-5

A polyethylene ball collides with a copper plate whose bottom face is fixed.

The ball has the downward initial velocity, which is set in the body attribute.

Two bodies constitute a boundary pair, on which the coefficient of friction is set.

The material properties are based on the Material DB.

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
Fix/Edge	Mechanical	Displacement	Select the XZ component. UX=0, UZ=0
Contactor/Edge	Mechanical	Contact surface	Contact Surface Classification: Contactor surface
Target/Edge	Mechanical	Contact surface	Contact Surface Classification: Contactee surface

The contactor and the contactee constitute a boundary pair. The coefficient of friction is set as follows.

Boundary Pair	Coefficient of Friction
Contactor-Target	0.4

The principal stress distribution at time t=5.0e-5[s] is shown below.

Due to the friction, the compression stresses are inclined in the Z direction with reference to the norm (1, 0, 1).

For comparison, the friction-free model is simulated for the same time duration.

Due to no friction, the stresses are distributed symmetrically with reference to the norm (1, 0, 1).

The traces of the center of the ball are shown below.

It starts at the top left, which is X=0 and z=0.

The traces are the same until the ball collides with the plate.

After the collision, the ball bounces in the different directions.

It bounces off horizontally when there is no friction, whereas it bounces back when there is a friction.