Car_Pole_Crash_Contact

Question

Hi All,

I tried to repeat the car_pole_crash tutorial. However, I could not make the contact relation between pole and vehicle defined as rigid wall properly (as in tutorial instructions).

I am sharing my model and instruction file in the attachment. I would be glad if you could help. Thanks.

Emre

Car_pole_crash_05_jan_19.pdf

fullcar_emre_hw_17.hm

emre güngör_22182 · Answer

Thank you for your opinion. Paying attention to what you said, I defined two different grnod sets and ran two separate runs. As a result of the analysis, I found the internal energy (1.75e8) and the displacement of node 4278 (304 mm) correct. However, I found the maximum von mises stress of 0.429 GPa, according to the course this value should have been about 1.5GPa. I could not understand the reason for my mistake at this point.

fullcar_emre_v17_hw_17.hm

fullcar_emre_v18_hw_17.hm

Adriano_Koga · Answer

2 things are missing in your definition:

1) the normal direction is not right, as you can see in the picture, your pole is facing downwards. You can reverse the normal direction

2) the slave nodes of the contact is not defined (grnode). You need to create a set of nodes (GRNOD) and select the desired nodes (probably the front of the car or even the whole car). after creating this GRNOD, assign it as slave set of nodes for your contact, where the pole is the master.

I believe the tutorial is missing this, but i haven't lookd at it in details.