Week - 3 Drop test Challenge

Cellphone Drop Test

Aim:

To create a complete simulation file from this to perform a drop test of the cellphone. *INITIAL_VELOCITY card is to be used to give velocity specifications for the cellphone.

Procedures:

Using the below Keywords in the order the required and appropriate constraints , velocity and properties are defined inn LS-Pre Post.

KEYWORD USED:

1. *CONTROL_TERMINATION -simulation time
2. *SECTION_SHELL - Shell id
3. *SECTION_SOLID - soolid id
4. *MAT_RIGID - ground material
5. *MAT_ELASTIC - phone material
6. *SET_NODE_LIST - phone nodes
7. *SET_SEGMENT (phone & ground segments)
8. *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE - contact between phone and ground
9. *INITIAL_VELOCITY - phone falling velocity
10. *DATABASE_ELOUT- Elements Results
11. *DATABASE_GLSTAT - Global energy Results
12. *DATABASE_MATSUM - Mat Results
13. *DATABASE_RCFORC - force Results
14. *DATABASE_BINARY_D3PLOT - plot Results

Result:

After running the simulation the results are plotted and the simulation video and element impact are as shown as below,

At the moment of impact, the cellphone experienced maximum stress is 2.294e-01 Pa and Minimum stress 2.294e-02 Pa.
The Ground is set to rigid with constraints on all directions in both translation and rotation.

The Simulation Video is as follows,

Video Link:https://drive.google.com/file/d/1It6gLXXP3YMf2ntDVE9_BYauNNUKeGzY/view?usp=sharing

Plot and Contour:

The Results of simulation is plotted below as per element and node. For specific results three random nodes at top, middle and boottoom are selected for the plot. Similarly Four random elements at top, middle and boottoom are selected for the plot.

All the variables tend to change at the time of 2 secoonds is observed on the plots.

Elements chosen for the plot are as mentioned as below,

Element Displacement

Element Velocity

Energy

Element Von_mises Stress

Effective plastic strain

Node Displacement

Node Coordinate

Node Acceleration

Node Velocity

Rigid Body Acceleration

Rigid Body Displacement

Rigid Body Velocity

Discussion:

The time duration of the simulation is 10 seconds and the stress distribution is as mentioned below. At the end of the simulation maximum stress is 3.746e-02 above the middle side elements of the phone, minimum stress is 3.0746e-03 is bellow the middle side elements of the phone.

The middle elements experiences aboout 2.622e-02 Pa of force.

Thus this is a simple droptest with velocity.

Conclusion:

Thus the droptest of celphone is stimulated with velocity using LS-DYNA and the polts are plotted accordingly.