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