Week - 3 Drop test Challenge

Objectives:

To perform a drop test in Is dyna by using the given model.

Procedure:

• Open the file in Is dyna File>Open>k.file>ok.

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 both the cellphone and the ground.
• Go to the Keyword manager and click on 'all'.

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 different material property for the mobile and the ground.

024-MAT_PIECEWISE_LINEAR_PLASTICITY CARD

• And go to SECTION for to create a section for the both mobile and the ground, since 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.

SECTION SOLID

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

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.

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.

INTIAL VELOCITY

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

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

CONTACT SURFACE TO SURFACE CARD

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

CONTROL TERMINATION CARD

• Go to the keyword manager>all>DATABASE>ascii and req for GLSTAT,RCFORC same like go to the binary and request 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 files are derived open the binary D3PLOT in ls prepost and run the animation.

Stimulation

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:

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