Abaqus how to avoid objects penetrate to each other

[BelleT]

Hello,

This is my first time using Abaqus to conduct a dynamic analysis. I'm trying to simulate drop test of a helicopter skid landing gear but the skid is not colliding to the ground but penetrates into it. Does anyone know how to solve this issue?

Thanks heaps!
BelleT

 

[FEA way]

Is general contact defined ? Did you apply initial velocity or displacement/velocity boundary condition to the deformable part ?

 

[BelleT]

Hi thanks for the reply!

Yeah I have created general contact and put "Hard" contact as the normal behaviour. And yeah I applied initial velocity to the landing gear (deformable part).

 

[FEA way]

You may have to refine the mesh. But also try adding mass and inertia to the reference point of the rigid body.

 

[BelleT]

I have tried to refine the mesh of the deformable part and their seed size are 0.5 now. Should I also refine the mesh of the rigid part?

I have also added a small mass(1kg) and inertia to the RP of the rigid body. Parts still penetrate to each other after trying both ways. Do you have any other suggestions? I have uploaded my .cae file if that helps.

Cheers

 

[FEA way]

Mesh of the rigid body should be less refined than the one of the deformable body.

This mass and inertia assigned to the rigid body should be higher because Abaqus uses it to calculate contact stiffness. Try increasing them significantly.

 

[BelleT]

I have tried to increase the mass and inertia of the rigid body significantly (~600 times of the deformable object) but I am still getting the same results. My deformable parts are made from wire with a beam section, I am not sure if this matters although i think it shouldn't as I am selecting 'All* with self' as the contact domain.

Thanks for your help along the way.

 

[Mustaine3]

Read in the manual how the shape/cross-section of beam elements is used in contact. I think this could explain the issue you see.
Maybe shell elements would be a better choice for you model.