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Mechanical Contact Problem, Fully Coupled vs Segregated Approach in Augmented Lagrangian Approach

Posted 11.10.2022, 01:12 GMT-4 General, Studies & Solvers, Structural Mechanics Version 6.0 0 Replies

Shyam Kishor
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Hello all, I am modelling a problem of rolling having two contact pair with large deformation. In defining the contact physics I followed these methods-

Method1- Solving using Penalty Method-

Solved succesfully with non-smooth result of contact pressure and there is noise in the curve of contat pressure along boundary.

Methhod 2 (a)- Augmented Lagrangian- Fully Coupled method

There is convergence error-

                     Failed to find a solution for all parameters,
                     even when using the minimum parameter step.
                     Maximum number of dogleg iterations reached.
                     Returned solution is not converged.
                     Not all parameter steps returned.

Method 2(b)- Augmented Lagrangian - Segregated Approach

Solved succesfully with smooth result of contact pressure (best result).

  • Now my question is that why I am not able to solve using method 2(a)?
  • I want to understand the mathmatics behind the these methods please suggest me any good recourses for it.
0 Replies Last Post 11.10.2022, 01:12 GMT-4
COMSOL Moderator

Hello Shyam Kishor

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