Week - 3 Drop test Challenge

Objective: To perform drop test simulation of a cell phone on a plate with initial velocity using LS Dyna.

Modal Image: 

                   

Procedure:

   1) Open the given Keyword file in LS Dyna. For this

       goto File >> Open >> LS Dyna Keyword File >> Select the given file >> click on open.

       File will be open in LS Dyna window

   2) Keyword Check. For this

       Go to right tool panel >> Model and Part >> Keyword >> check the model properly

       We can see that both shell and solid elements are there, but for the given analysis we required only solid element. 

       Hence delete the shell element. 

       For this select the element and click Keyword Del

                       

   3) Create Material Card (Cell Phone). For this

       go to right panel >> Keyword manager >> all >> MAT >> 024 - Piecewise_Linear_Plasticity >> Title = "Cellphone_Material" >> Density = 2.7x 10^-6 >> Elasticity = 70 >> PR = 0.33 >> SIGY = .276 > ETAN = .562 >> Accept >> Done 

   

   Create Material Card (Cell Phone). For this

       go to right panel >> Keyword manager >> all >> MAT >> 020 RIGID >> Title = "Plate_Material" >> Density = 7.8x 10^-6 >> Elasticity = 210 >> PR = 0.26  >> Accept >> Done 

  

  4) Create the section Card for Cellphone
       go to right panel >> Keyword manager >> all >> Section >> Solid >> Title = "CellPhone_Section" >>EL = 1 >> Accept >> Done 

       

   Create the section Card for Plate

       go to right panel >> Keyword manager >> all >> Section >> Solid >> Title = "Plate_Section" >>EL = 1 >> Accept >> Done 

     

   5) Assign Material Card and Section Card to part

       For this go to  right panel >> model and part >> keyword manager >> model >> part >> assign the MID and SECID cards to their respective parts.

                    

                        

  6) Apply Boundary Condition

      Create node set ID  (Plate) 

      For this go to  right panel >> model and part >> create entity >>set data >> set node >> select the nodes by area in plate >> node set created for plate >> title = plate_node >> Apply >> Done

Create node set ID  (Cellphone) 

      For this go to  right panel >> model and part >> create entity >>set data >> set node >> select the nodes by area in cellphone >> node set created for plate >> title = cellphone_node >> Apply >> Done

     

    Boundary Condition to plate (Rigid)

    For this go to  right panel >> model and part >> create entity >> boundary >> Spc >> create >> set >> all fix [111111] >> node set id foe plate >> select nodes >> apply >> done 

           

   7) Assign Initial velocity to cell phone

      For this go to  right panel >> model and part >> display entity >> select velocity >> velocity direction will be displayed 

                   

   9) Assign control termination card 

      For this go to  right panel >> model and part >> keyword manager >> all >> control >> termination >> specify termination time is 5 ms  >> accept >> done 

      

  10) Create contact interface between cellphone and plane

       create set of segments for cellphone 

        For this go to  right panel >> model and part >> create entity >> set data >> *SET_SEGM >> select cellphone elements >> cellphone segment created 

      create set of segments for plate

        For this go to  right panel >> model and part >> create entity >> set data >> *SET_SEGM >> select plate elements >> plate segment created 

                                    

   Now create contact card 

    For this go to  right panel >> model and part >> keyword manager >> all >> contact >> AUTOMIC SURFACE TO SURFACE >> select plate segment as master and cellphone segment as slave >> accept >> done

                       

   11) Define the output database as both BINARY D3PLOT & ASCII

        For this go to  right panel >> model and part >> keyword manager >> all >> database >> DATABAE_BINARY_D3PLOT >> DT = 0.1 >>  accept >> Done

      

     go to  right panel >> model and part >> keyword manager >> all >> database >> ASCII_Option >> for GLSTAT & MATSUM , DL = 0.1 >> accept >> done 

    

  12 ) Model Checkup 
        

        go to  right panel >>  Model Checking >> Keyword Check >> recheck >> correct the error if any , warnings can be ignore
                   

    13) Run the simulation

         1. Open  LS Run.

         2. Open the file and run the analysis, If it achieved normal termination, means model is ready for post processing. 

             

     14) Post Processing

          1. Open another LS Pre Post window.

          2. go to file >> open >> LS Dyna Binary Plot >> select the d3 plot file 

          3. Plot stress contour

              go to right pannel >> Post >> frienge component 

              

          4. For energy plot result 

             go to right pannel >> Post >> ASCII 

              

  Conclusion

     1. Performed a drop test simulation of a cell phone droped on a plate under initial velocity using LS-Dyna.