﻿ Elastic Collision with Initial Velocity DistributionExamples | Product | Murata Software Co., Ltd.

# Example64Elastic 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.

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