Meshing of bumper assembly with mesh size of 6mm. To perform simulation on crash tube model using Radioss

Objective:

• Meshing of bumper assembly with mesh size of 6mm.
• To perform simulation on crash tube model using Radioss.

Procedure:

• Import bumper assembly model into hypermesh
• Mesh the bumper assembly with mesh size of 6mm
• Add 1D element connector to it such as spot weld

Case1:

• Import crash tube model into hypermesh as Radioss
• Run the model as it is

• we can see internal energy starts from zero and goes on increasing

• by the above simulation we can see that till the notch area crash tube failing first and after that rest of the tube is crushing

Case2:

• Change the Inacti=6 and run the file

• comparing 1st and 2nd case contact force is same

• we observe that von mises value similar for 1st and 2nd case

Case3:

• Create the Type11 contact and run the file

• contact energy increases slightly

• in this case contact force is slightly increased compared to case 1 and case 2 becase of gapmin factor

Case4:

• Remove both notches and remove boundary condition on rigid body node then run

• in this case stress is less contact force is less because of the removal of notch and boundary condition

Case5:

• Create a new notch in the middle ,select the whole section and run.

• we can see contact force is less compared to all the above cases

Case6:

• Create a new notch with nodes only from opposing 2 faces and run.

• we can see the highest peek point due to opposing notches

Conclusion :

• by comparing all the results we can say type 11 with recommended property with opposing notch gives the best results