﻿ Analysis of an Fallen ObjectExamples | Product | Murata Software Co., Ltd.

# Example33Analysis of an Fallen Object

### General

• An object consisting of a substrate and a frame falls onto the floor and bounces off.

• The deformation, the displacement and the mechanical stress are solved.

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

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### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

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

The acceleration, the transient analysis, and the high-level setting tabs are set up as follows .

 Tab Setting Item Settings Acceleration Acceleration (X,Y,Z) = (0, 0, -9.8)[m/s2] Transient analysis Time step 0.0005[sec] Calculation steps 20 Output steps 1

### Model

The object falls from the height of 1.5[m].

The calculation starts when the object is 0.001[m] off the floor, at which time the object has the initial velocity of -5.420369[m/s].

The frame and the substrate are solid bodies. The floor is a rigid body.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Mesh Size Material Name 9/Solid FRAME 10 001_Al * 10/Solid SUB 5 008_Cu * 11/Solid RIGID Rigid

* Available from the Material DB

Material property of the rigid body is set up as follows.

 Material Name Tab Settings Rigid Elasticity Young’s modulus: 1.0e20[Pa] Poisson’s ratio: 0.0 Density 1000[kg/m3]

Initial velocities are set in the body attributes.

 Body Attribute Name Tab Settings FRAME Initial Velocity (X,Y,Z) = (0, 0, -5.420369)[m/s] SUB Initial Velocity (X,Y,Z) = (0, 0, -5.420369)[m/s]

### Boundary Conditions

The bottom face of the frame makes a contact with the top face of the rigid floor.

The displacement of the rigid floor is set to zero, because it is fully fixed.

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings Contactor/Face Mechanical Contact surface Contact Surface Classification: Contactor surface Target/Face Mechanical Contact surface Contact Surface Classification: Contactee surface Fix/Face Mechanical Displacement Select UX, UY, and UZ all. Set all components to zero.

* After setting the contact surface, go to the [Model] tab,

and click [Boundary Pair] . Pair “Contactor” and “Target” in the Boundary Pair dialog box.

### Results

The general mesh size is set to 14.

The contour diagrams below show von Mises equivalent stress. Note that “Specify ratio” is set to 10 on the Displacement Diagram tab of [Graphics Setup].

The rigid body is hidden.

The moment of the collision (t = 0.0002[sec])

0.0001 seconds after the collision (t = 0.0003[sec])

0.0003 seconds after the collision (t = 0.0005[sec])

These diagrams show that the substrate deforms as time passes since the collision.

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