Challenge 3 Drop Test of Phone

                                          Drop Test Of Phone

Aim: To create an input deck from the given FE model of Phone and Ground

Step 1: The file is loded to Ls-Prepost

Step 2: *Section cards are created for both Shell and Solid. For shell skin part, I have assigned a thickness of 1mm with ELFORM 2 and for Solid parts, i have assigned an ELFORM value of 1.

Step 3: Materials are being created. For all the three parts, i have assigned the material properties for steel. For the skin part, i have choosen *Material_Elastic (MAT001). For the Solid Ground part, i have choosen MAT20 Rigid and for Phone solid part, i have choosen MAT24 Piecewise_Linear_Plasticity.

Steel properties: E=2.1e5, Density=7.85e-9, Pr=0.3, σy=400 and ETAN=10000

Step 4: Sections and materials are assigned to the respective parts in Parts tab.

Step 5: Single point contraints has been defined to the ground parts by arresting all the DOF to ensure that it should not displace when the phone hits the ground.

Step 6: An *initial_velocity of 10000 mm/sec has been given to the phone in negative Z direction.

Step 7:  Control Termination has been given to the model with DT=0.005 ms

Step 8: Database Binary D3plot card has been given to the model with DT=0.0001 ms so that the output data will be written every 0.0001th milli second of the total run time (0.005 ms).

Step 9: Contact has been defined with the card Automatic_Surface_To_Surface by defining the Phone (plastic part) as slave and Ground (Rigid) as master. 

Step 10: The model is checked with "model checking" tab and the the file has been saved as Keyword file (.k).

Step 11: The Key file is being loaded into ls-program-Manager and is allowed to run. At the end, Normal termination has occured and D3 plots are automatically written and saved to the folder.

Step 12: The D3 plot file is opened in ls-prepost and the output has been checked. 

RESULTS OBTAINED:

1. Plots of KE, IE and TE

2. Von Mises Stress. The maximum value obtained is 1.26x10^2 Mpa.

3. The Effective Plastic Strain obtained is 2.1x10^-3.

4. Z displacement of a particular element

Conclusion: 

An input deck from the given FE model of Phone and Ground is created and the results are being plotted.

*All the necessary files are attached with this report.

Thanks & Regards,

Rakesh