I have Higher order elements (with mid-side nodes) on the two contacting surfaces & I want to analyse the problem using NTN Contact. Can I create NTN Contact between the mid-side Nodes?
Due to the uneven nature of the kinematically consistent reaction forces at the nodes of midside-noded elements, NTN contact should NOT be applied to mid-side nodes. In effect, usage of NTN implies that only lower order elements be used for underlying mesh of contacting parts. Return to Top 46. While editing the real constants of a Contact element, like FKN can negative values be entered? In the Real Constant menu, a negative value indicates an absolute value; and a positive is considered as a factor. So if FKN was specified as 0.1, its considered as 0.1*E Else, if FKN was specified as -2e10 then the value of FKN for the analysis is -2e10 Return to Top 47. How does FTOLN affect convergence & Accuracy of results? After FKN, FTOLN is the next parameter that affects both convergence & accuracy. Its usually known as Penetration Tolerance(TOLN) This is a factor of the depth of the underlying element. If the underlying elements depth was [h], and if FTOLN is specified as 0.1 (default value),
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