Week - 3 Drop test Challenge

Week - 3 Drop test Challenge:

objectives: To perform a drop test in ls dyna by using the given model.

procedure:

• open the file in ls dyna FILE>open>k.file>ok.

                                          

                                                    img:model of cellphone and ground

• As we know in LS-DYNA every entities are created by the *KEYWORDS,so now we have to create a deck by using *KEYWORD to make it ready for it to solve the problem.
• first thing create *MAT and  *SECTION for the both the cellphone and the ground.
• Go to the Keyword manager and click on 'all'.

                                    

                                                          img:keyword manager

• go to the *MAT and choose 024-MAT_PIECEWISE_LINEAR_PLASTICITY as the material model,and enter the properties.Create two MAT_24 for the mobile and the ground and give diffrecnt material property for the mobile and the ground.

                                   

                                                                 img:024-MAT_PIECEWISE_LINEAR_PLASTICITY CARD

• And go to *SECTION for to create a section for the both mobile and the ground,sincde it both are solid we create a *SOLID card.ELFORM let be 1 for both the part.create a specific SECID for both the *SECTION.

                                

                                                                                  img:*SECTION_SOLID

• Now it time to associated with rhe part go to the part keyword and assign the both *SECTION and *SOLID to the *PART.

                              

                                                                                img:*PART card

• before giving velocity to the mobile phone we have to create a set because the mobile phone has many nodes to considered to give the velocity for the entire mobile phone.So go to the create entity>set>set_node>cre>select the mobile as part,so nodes of the part will be selected and give the name for the set.

                              

                                                                                  img:*SET_NODE_ card

• now go to the *INTIAL card for give the velocity for the mobile phone,keyword manager>INTIAL>VELOCITY and enter the nodeset_ID which we created for the mobile phone.Enter the velocity as -15mm/ms at z axis.

                            

                                                                   img:*INTIAL_VELOCITY

• Now go to the create entity>spc>enter the Nodeset_ID and click ok.

                           

                                                                     img:*BOUNDARY_SPC_SET

• Now it time to create a contact between the two parts we dont want the mobile to peneterate into the ground,so go to the keyword manager>all>*CONTACT>*AUTOMATIC_SURFACE_TO_SURFACE.As we already create a node set enter the ID in SSID and MSID,in this case mobile phone is a slave so give SSID and the ground is the master so give MSID 

                       

                                                                     img:*CONTACT_SURFACE TO SURFACE card.

• give the *TERMINATION time for the model so go to the keyword manager>all>*CONTROL>TERMINATION.

                    

                                                                   img:*CONTROL TERIMINATION Card

• Go to the keyword manager>all>*DATABASE>ascii and req for GLSTAT,RCFORC same like go to the binary and requesst for D3PLOT req everything for DT as 0.05ms.
• save the file as k file and run the stimulation using either ls run or ls manager.
• once the output fileas are derived open the binary D3PLOT in ls prepost and run the animation.

                             

                                                                                                    GIF:stimulation

link:https://drive.google.com/drive/folders/1_iIKdBwmEqApeP6pFRKsUFvjQ9P9TB1E?usp=sharing

Result:

• created different *keywords for to represent all the entities in the GUI.
• model check as been done to check for any error in the keywords.
• stimulation has been done.

learning objectives:

• leaned how to create a keywords for to represent the entities
• learned how to stimulate the model.
• learned how to request for the different output files.

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