Week - 3 Drop test Challenge

CELLPHONE DROP TEST

OBJECTIVE:

To familiarize the LS-PrePost interface by performing the drop test of a cell phone model.

1. To create and assign material and section ids to the parts.
2. To create node sets to define the boundary conditions.
3. To setup termination cards and output files.
4. To plot the results

MODEL USED:

Unit system: kg mm ms

BOUNDARY CONDITIONS:

1. The base part is completely fixed.
2. Initial velocity of 5m/s is applied on the cell phone.
3. The simulation time is set to 5ms.

CASE SETUP:

1. Import the model to the Ls-PrePost.
2. Now, delete the shell elements in the model.
3. Create a boundary spc card for the base components restricting all degrees of freedom.
4. Now, create a node set selecting all the nodes of the cellphone model.
5. Create an initial velecity card for the cellphone node set. The given initial velocity for this node set is 5m/s.
6. Now, create material cards for the cellphone part and for the rigid base.
7. Create section IDs for the solid body.
8. Assign material id and section id to the Parts.
9. Create CONTROL TERMINATION CARD.
10. Create a contact card with automatic surface to surface contact.

RESULTS:

Equivalent stress:

z-stress:

INTERNAL, KINETIC AND TOTAL ENERGY:

As expected at the time of contact the kinetic energy dropped and the internal energy increased.

CONCLUSIUON:

Found the maximum stress generated on the cell phone at the time of impact.

Understood the use of basic tools and features in the LS-PrePost.