Week - 3 Drop test Challenge

Aim:

Drop test challenge using Ls-dyna, cellphone dropped to a plate under initial velocity.

To create:

To update the simulation file (input file ) from the given K format type of file and create the below properties.

• material card
• a section card
• assigns material and section card to the part.
• boundary conditions for plate.
• initial velocity to the phone.
• control termination card.
• a contact interface between cell phone and plate.
• output database as both binary D3 plot and ASCII.

SOFTWARE USED :

Solver tool - LS-Prepost 4.10 and LS-Run 1.0.100838 (Student)

Procedure

• Import the file
  file>import>LS-Dyna>keyword file

• Check keywords
• Side bar>Model and part>keyword manager
  
  
  

• Only solid elemetns is required for this analysis, delete the shell elements.

Material Creation

Creating material MAT

Side bar > model and part > keyword manager > MAT > all> select required the material for plate and phone

Plate-020 RIGID.

cell phone- 024 PIECEWISE_LINEAR_PLASTICITY

Following kg/mm/ms, where

• MID- material ID
• RO- Mass density
• E- young modulus
• SIGY- yield stress
• ETAN- Tangent modulus
• PR- Poissons ratio

Section card

For analysing section solid we create section_solid

• Side bar > model and part > keyword manager >all > solid > created the new SECIDs for both parts.

Assigning material cards and section cards to parts

• Side bar > model and part > keyword manager >model> parts

Creating nord set id

• Side bar > model and part >entity cretion> set data>cre> setID 1>cellphone_node
• Side bar > model and part >entity cretion> set data>cre> setID 2>plate_node
  
  

Creating boundary condition for plate

• Side bar > model and part >entity cretion>boundary>Spc>cre>set> alll fix[111111]

Initial Velocity

• Side bar > model and part > keyword manager >all > initial>velocity>NSID 1>VZ -6.000

Checking Diection of velocity

• Side bar > model and part > display entity> initial>velocity>NSID

Assigning control termination

• Side bar > model and part > keyword manager >all >control>termination>endtrim 5

Create contact interface

•  Side bar > model and part >entity cretion> set data>set_segm>select area plate
• Side bar > model and part >entity cretion> set data>set_segm>select area cellphone

Creation contact between cellphone and plate

• sidebar> model and part>keyword manager> Contact>automated_surface_to_surface

output database as both binary d3plot and ascii

• sidebar> model and part>keyword manager> data base>binary_d3plot

      

• sidebar> model and part>keyword manager> data base>ASCII_option> GLSAT (DT 0.1), MATSUM (DT 0.1)

Model check up

Run simulation

• File> Run LS-DYNA
  

Post Processing

• contour plot of von misees stress

• Energy plot of drop test

RESULT

Test is performed using LS Dyna solver and ploted the curves.;

Maximum=0.0255823MPa 

Conclusion

I have learned to create following prperties.

• material card
• a section card
• assigns material and section card to the part.
• boundary conditions for plate.
• initial velocity to the phone.
• control termination card.
• a contact interface between cell phone and plate.
• output database as both binary D3 plot and ASCII.