Example64 Elastic Collision with Initial Velocity Distribution

General

An object is given an initial velocity, and collides with a rotating object. Transient analysis is performed on the elastic collision.
The stress distribution, the displacement distribution, and the velocity distribution during the collision are solved.
Unless specified in the list below, the default conditions will be applied.
The mechanical stress transient analysis is available in an optional package.

Analysis Space

Item	Setting
Analysis Space	2D
Model unit	mm

Analysis Condition

To simplify the simulation, the 2D model is created and analyzed.

“Large deformation” is selected, as it is expected.

Item	Setting
Solver	Stress analysis [Galileo]
Analysis Type	Transient Analysis
Large Deformation	Select Large displacement

The transient analysis is set up as follows.

The time steps after the collision are smaller than those before the collision.

Tab

Setting Item

Setting

Transient Analysis

Table

Number	The number of steps	Output Steps	Timestep [s]
1	10	1	0.1×10-4
2	80	1	0.025×10-4

Model

Circular sheet bodies represent objects.

The contactor and contactee surfaces are paired in the “Boundary Pair” dialog box.

Body Attribute and Material Property

Body Number/Type	Body Attribute Name	Material name
0/Sheet	Body_Attribute_001	001_Al *
1/Sheet	Body_Attribute_002	001_Al *

* Available from the material DB

The initial velocity of the right object is set as follows. That of the left object is 0 by default.

Body Attribute Name

Initial Velocity

Body_Attribute_001

Read distribution

Body_Attribute_002

X component: -100[m/s]

Y and Z components: 0[m/s]

Boundary Condition

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Setting
Contactor/Edge	Mechanical	Contact Surface	Select “Contactor surface”.
Target/Edge	Mechanical	Contact Surface	Select “Contactee surface”.
Coefficient of friction : 0.4

The contactor and contactee surfaces are designated as a contact pair in the “Boundary Pair” dialog box. In contact analyses, the contact surfaces must be designated as a boundary pair.

Results

The displacement is shown below. The vectors are velocity. The unit of velocity is [m/s].

The friction with the rotating object causes deformation in the Z direction. The object with an initial velocity rotates after the collision.

On the [Results] tab,

click [Create Animation] .

The animation gives you a visual understanding of the objects’ state before and after the collision.

See other Stress Analysis examples.