Week - 3 Drop test Challenge

Objective:

To simulate crash test for a mobile phone.

Procedure:

1.Meshed model is imported in to LS-Dyna.

2.We need to define cards for the model.

Cards needed to create are

• Part
• Material
• section
• contact interface
• Initial velocity
• Output requests

3.We need to define the material card for both mobile phone and rigid body.

Mobile phone	Rigid wall

Here MAT_24 Linear plasticity card is selected for Mobile phone and MAT_20 rigid is used for Rigid body.

Aluminium properties are selected for Mobile phone.

4.Section card is created for defining sections for shells and solids.

Shell	Solid

5.These two cards are imported in to part card to define components.

Rigid	Mobile phone

6.Contact interface should be defined between rigid body and mobile phone.Selected interface is surface to surface.

7.Intial velocity is added to the nodes of the mobile phone.It is 10 mm/ms

8.For Output requests like forces and displacement.We need to create DATABASE cards in the model.

ASCII	D3PLOT

9.We save and export the file to LS-Run

Solution:

Simulation animation we get after running is,

With the given velocity and material,Mobile phone bends after hitting rigid wall.

Deformation rate in the mobile phone is given below.

Here the displacement is upto 20mm.That is really high for a mobile phone which can impact on the performance of inner circuits.Where as energy plot is given by

Internal energy in the model is increasing when the deformation starts.This happens because of the molecular movement inside the component.

Kinetic energy decreases in the component after body hits rigid body as it slows down. Total energy is the sum of kinetic and internal energy.