﻿ Frictional Contact (#2)Examples | Product | Murata Software Co., Ltd.

# Example44Frictional Contact (#2)

### General

• A ball collides with a plate. The friction is exhibited during the collision..

• The deformation due to the friction can be observed.

• Unless specified in the list below, the default conditions will be applied.

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### Analysis Space

 Item Settings Analysis Space 2D Model unit mm

### Analysis Conditions

 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

### Model

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.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 0/Sheet Body Plate 008_Cu 1/Sheet Body Block 000_Polyethylene(PE)

The material properties are based on the Material DB.

### Boundary Conditions

 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

### Results

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.

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