August 25, 2023 at 12:16 pmSolutionParticipant
There is always mesh discretization issues with contact between curved surfaces. In general, curved contact and target surfaces can be well approximated by linear (lower order) or quadratic (higher order) contact and target elements when the mesh is sufficiently refined. However, in certain circumstances this is not the case; for example, when linear elements are used or when the midside nodes of quadratic elements do not lie exactly on the initial curved geometry. Thus, in some contact applications, using a faceted surface in place of the true curved geometry can significantly affect the accuracy of contact stresses. These issues are minimal if the meshes on the two surfaces match. Contact matches enable to match mesh nodes between topologically disconnected solids within a specified tolerance. In attached WB file, contact status is shown with the contact matches used to match the nodes on contact surface Similar contact status result can be obtained for a coarse mesh using Geometry correction option in the details of the contact. The geometry correction option was implemented to help resolve these issues for non-matching meshes. The Smoothing option in the geometry correction enables you to improve the accuracy of circular edges (2D) and spherical or revolute surfaces (3D) by evaluating the contact detection based on the exact geometry instead of the mesh. In attached WB file, please check the contact status for the system with geometry correction “smoothing” enabled. If you set the contact and target correction options to “smoothing” in the Details Windows of the contact, the non-matching mesh results should closely agree with the mesh matching results.
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