What affects the accuracy and convergence of a contact analysis?
(FKN) Stiffness used for the Contact is a major factor affecting Convergence of Contact problems. Using Higher values of Stiffness may diverge the solution. Its advised to start with a small enough value and get a converged solution. Re-solve with increased value of stiffness so long as the problem stops converging. Trial-and-Error + Experience will help you predict the Contact Stiffness needed to solve a Contact Analysis. Another recommended practise is to run the analysis with an initial small contact stiffness and then slowly increase the stiffness over a series of load steps. This will ramp the contact stiffness value from the initially considered Stiffness, thus improving convergence behavior. The results for the last loadstep would have been analyzed with more stiffness and hence would be more accurate than previous results. Return to Top 38. What is Hertz Stiffness? How is it calculated? Hertz Stiffness provides an approximate value for the Penalty Stiffness value. Kh = l*E wher
