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), a penetration of (0.1*h) is allowed. If this value was exceeded during the solution, then solution does not converge. Its aborted. In effect, this value can be treated as the Maximum allowable penetration. Setting too small a value can also affect in the form of excessive iterations or non-convergence. Return to Top 48. How and where is contact detected? For STS elements, only the Target
