Initial Von Mises stresses on motorcycle frame

Altair Forum User

Dear forum, 

 

I am simulating a motorcycle crash with a rigid wall and I have a problem in the frame. I applied an initial velocity to all the components of model and since the first frame of the simulation there are Von Mises stresses on my frame, before impact. I wasn't able to find the problem. 

I use TYPE7 contacts and rigids to join parts.

Could these stresses being caused from inertia?

 

Thank you in advance 

Nachiket Kadu_22143

Altair Forum User said:

Dear forum, 

 

I am simulating a motorcycle crash with a rigid wall and I have a problem in the frame. I applied an initial velocity to all the components of model and since the first frame of the simulation there are Von Mises stresses on my frame, before impact. I wasn't able to find the problem. 

I use TYPE7 contacts and rigids to join parts.

Could these stresses being caused from inertia?

 

Thank you in advance 

How much stresses we are talking about here??

Altair Forum User

Hi,

 

Can you check if there is any initial penetration in your model?

 

If possible, please share starter and engine .out files.

Altair Forum User

I think I found the problem. I forgot to assign an initial velocity to the mass (admas) of my engine. Now the initial stresses are gone! Could this be the only problem? 

Korosh_20927

Altair Forum User said:

I think I found the problem. I forgot to assign an initial velocity to the mass (admas) of my engine. Now the initial stresses are gone! Could this be the only problem? 

hi

How can you Assign mass?

Simon Križnik

Hi,

 

the procedure to add mass:

 

When assigning loading like initial velocity and gravity make sure to also select nodes or components of added mass.

 

Korosh_20927

thank you