Rigid Body Motion/Out of convergence in ansys Classic 14.5

In summary, rigid body motion in ANSYS Classic 14.5 is the movement of an object as a whole without internal deformation or strain. It uses the finite element method to handle this motion by breaking the body into smaller elements. Convergence in ANSYS Classic 14.5 is the process of reaching a stable solution and is achieved through adjusting input parameters and troubleshooting any issues. Common causes of out of convergence in ANSYS Classic 14.5 include incorrect boundary conditions, material properties, element types or sizes, and rigid body motion, all of which can be addressed through various methods.
  • #1
Bruce321
2
0
Hi all,

I am analysing a 2D D-shaped Neo Hookean model in contact with a Rigid link. The details are in the input file attached. Can someone guide me on how to solve this issue?:headbang:

Thanks,
Bruce
 

Attachments

  • Input.txt
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  • #2
The best way to see what is moving in your model is to run a modal solution on it. Extract the first 10 or 20 modes and then animate them and see how your model is moving. You will have to add mass to the model for the solution to work.
 

1. What is rigid body motion in ANSYS Classic 14.5?

Rigid body motion in ANSYS Classic 14.5 refers to the movement of an object as a whole, without any internal deformation or strain. It is a type of structural analysis that assumes all points on the body move in the same manner and direction. This type of analysis is useful for large, solid structures that are not affected by small deformations.

2. How does ANSYS Classic 14.5 handle rigid body motion?

ANSYS Classic 14.5 uses the finite element method to handle rigid body motion. This method breaks down the body into smaller elements and calculates the movement and deformation of each element. The results are then combined to determine the overall movement of the rigid body.

3. What is convergence in ANSYS Classic 14.5?

Convergence in ANSYS Classic 14.5 refers to the process of reaching a stable solution for a given analysis. It is important to achieve convergence in order to ensure accurate and reliable results. This process involves iteratively adjusting the input parameters until the solution no longer changes significantly.

4. How does ANSYS Classic 14.5 handle convergence issues?

ANSYS Classic 14.5 has various features to help handle convergence issues. These include automatic time stepping, adaptive mesh refinement, and convergence controls such as adjusting the convergence criteria and maximum iterations. Additionally, the user can troubleshoot convergence issues by checking the model geometry, material properties, and boundary conditions.

5. What are common causes of out of convergence in ANSYS Classic 14.5?

Out of convergence in ANSYS Classic 14.5 can be caused by various factors such as incorrect or unrealistic boundary conditions, incorrect material properties, inappropriate element types or sizes, and insufficient time steps. It can also be caused by rigid body motion, which can be addressed by using appropriate constraints or defining the rigid body as a separate part in the model.

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