Challenge

Week - 5 - Modelling Spotwelds

  AIM:

       Run a crash box simulation using beam spot weld and solid hexa spotweld and compare the result (axial and shear force).

 EXPLANATION:

  •       Modelling of spotweld is very important as it help to keep the sheet metal together.
  •       Material modelling and its failure method are very important parameter which needs to be considered while simulation.
  •      In LS-DYNA there are 4 method to model spot weld they are using beam elements and tied contact;solid hexa and contact spotweld.

 PROCEDURE:

    STEP 1:

            Given model for modelling the spotweld.

         

     STEP 2:

           To create Beam spotweld-----Go to elem tool----edit element----create---beam type----proceed.

                           

    STEP 3:

           Select the node plate.

           

                    BEAM_SPOTWELD HAS BEEN CRETAED.

        

      STEP 4:

              Go to create entity----rigid wall----create ---planar.

        

     STEP 5:

               Create set ID-----SET NODE/SET PART/SET SHELL.

          

           

           

     STEP 6:

              Create MAT------PIECEWISE_LINEAR_PLASTICITY-----FOR STEEL.

            

     STEP 7:

            Create-----MAT-----SPOTWELD---STEEL

            

                              RIGID WALLL -----PLANAR

             

                  SECTION----BEAM-----ELFORM 9 to be created.

              

                              SECTION-----SHELL-----FOR PLATES

               

                         CONTACT-----TIED_SHELL_EDGES_TO SURFACE----cretaed.

               

                         INITIAL VELOCITY----9.8m/s to be created.   

               

        STEP 8:

                 Go to LS-RUN------run the simulation.

               

                

      STEP 9:

                 BEAM_SPOT WELD hs been created-------simulation has been done.

               

                        STRESS----X-stress----ASCii 

                

                           ASCII-----STRESS-----Y STRESS---simulation.

                  

                           ANIMATION OF FINAL SIMULATION OF  BEAM SPOT WELD

               

       STEP 10:

                 Created hexa solid spot weld-----delete the beam spot weld.

                

                           SOLID_HEXA SPOT WELD

                

                            For solid spot weld section _solid need to create

               

                          CONTACT---- SPOT WELD need to be created.

              

      STEP 11:

                Final animated of solid spot weld.

             

    STEP 12:

            Go to ASCII-----load----axial force ----for solid spot_weld.

                         

                      ASCII------shear force-----for solid spot weld

                

    STEP 13:

                 ASCII-----beam ---spotweld-----axial force

                    

                 ASCII-----BEAM---SPOTWELD-----SHEAR FORCE

          

      STEP 14:

                  Total /internal /kinetic energy of GLSTAT -------------solid spotweld

         

                        ENERGY----- HOURGLASS----GLSTAT

            

                             SLIDING ENERGY

             

    STEP 15:

                  BEAM SPOTWELD

              Total----kinetic----internal energy

           

                      HOURGLASS ENERGY

          

           

   STEP 16:

                Aceerlation of nodal point----solid spotweld.

           

                           Accerlation of nodal point-----beam spotweld.

               

  STEP 17:

            Maximum directional stress and strain along the length of the crashbox (X strain, Y strain )

                                BEAM SPOTWELD

         

           

                         SOLID SPOTWELD

           

            

   STEP 18:

                 Secforce of beam spotweld

          

                     Secforce of solid spotweld.

                     

  RESULT:

      CASE 1:

               The relevant the beam spotweld----with the simulation

         

        

      CASE 2:    

                  The solid spot weld  with the simulation

          

         

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