CAE Software【Femtet】Murata Software Co., Ltd.
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.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
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 |
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 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] |
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.
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.