ANSYS Static Structural Analysis, Defining a Rigid Body and contacts


I have a problem in ANSYS Static Structural Analysis when there are contacting surfaces. I explained the situaition below, could you please help me?


I need to realize a static structural simulation where there are two contacting bodies as one of them is defined as rigid (brown body) and the other one is defined as deformable (yellow body) shown in the picture below.

The Force on the Circular Surface:

In the picture; the brown body is rigid and the yellow body is deformable. I apply a force in the negative x direction on the circular surface as shown in the picture. Note: This force is caused by frictional forces so the loading type is possible in reality and comprehensible.

The Displacement on Circular Surface:

I also define displacement for this circular surface as to be zero in the y and z directions and to be free in the x direction. For the contact surfaces. (Detailed note: This circular surface is actually mounted on a sliding rod, and rod moves with the yellow part)

The Contact Surfaces between brown and yellow parts:

For the contact surfaces, I tried many things but couldn't successfully define them and oobtain the results. I tried to define frictionless contact region, but I got nothing but failures because of this.

Note: When the force is applied, because of the bending trend of the yellow part, the contacting surfaces can be seperated throughout the course of analysis. So the contact surfaces which are fully in contact with the rigid body at the beginning is most probably going to be seperated.

Would you please enlight me with your wise ideas about how to do this?

Thanks for your time reading my question and your sincere thoughts, sincerely


Best Answer


  • @mtcnonn

    I don't understand your problem.

    It seems like you have two bodies and you are separating them. In that case, there is nothing left to analyze except the acceleration of the yellow part, which you can do with a hand calculation of F = ma.

  • mtcnonnmtcnonn Member
    edited November 2020

    Thanks for your kind responses, I overcome the problem by applying the right way of the force and by defining the cylinder part as filexible body whose BCs are fixed support instead of defining a rigid body. I used frictional contact (Augmented gauss points, stiffness factor of 0,1) between the conducting surfaces and when checked contact info there was no problem seems there as well. The analysis realized in a few iteration steps, like 5-6 on average and the results were satisifying the BCs like force and moment equilbrium.

    However, there was a little corcern I have about the contact surfaces. When I accomplished results, I could see the contact surface area in both contact surfaces for some analyses. But among the other fork simulations, I encounter in the solution output file which is under alaysis section in the mechanical interface that there was no surface area information. (Surface areas are in touch when there is no force applied at the beginning). Could you tell me if you have any thoughts about this faulty?

    Thanks ,

    Murat Can

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