But, contact is not the only source of convergence problems. Today in Abaqus/Standard, the best way to avoid the convergence issues associated with contact is to follow the recommendation and use general contact. So, any discussion of convergence will naturally lead to a discussion of contact and vice versa. Why are contact and convergence often linked?Ĭontact presents challenges to the nonlinear solution method used by Abaqus/Standard. It will use the finite-sliding contact tracking by default but it can be configured to use the small-sliding tracking algorithm. General contact has penalty constraint enforcement to improve convergence characteristics. General contact includes the supplemental formulations for edge-toface, edge-to-edge, and vertex-to-face contact which can be very helpful and which are not available with contact pair definitions. Some of this issues are contact snagging, contact chattering, and unwantedĬontact penetrations. This discretization also allows users to avoid issues associated with the node-to surface discretization. General contact uses the surface-to-surface contact discretization to enhance solution quality. The recommended contact in Abaqus/Standard today is general contact. Latest and greatest contact in Abaqus/Standard The Abaqus user may be unable to build a satisfactory Abaqus/Standard model for this case unless they are aware of the techniques for handling convergence issues and for defining effective contact. Wrinkle and buckle and eventually come into contact with itself. When the thin disked is pulled through the ring, for example, it will An additional challenge when modeling many of these structures is the presence of contact. The really interesting finite-element models, like the one shown in the picture here, exhibit behaviors that can present challenges to the nonlinear solution method employed by Abaqus/Standard. Contact and Convergence in Abaqus/Standard
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