lt="$K_{n}^{U}$" style="width:22px;height:17px;"> can be computed by 2 different formulas:</p><div><ul><li><b>Constant</b>:</li></ul></div><p><img src="ContactForceN_ElastoPlasticLinear_eq01257831337041450424.png" alt="$$K_{n}^{U} = \frac{K_{n}^{L}}{e^{2}}$$" style="width:65px;height:33px;"></p><div><ul><li><b>Variable</b>:</li></ul></div><p><img src="ContactForceN_ElastoPlasticLinear_eq05538857522549025049.png" alt="$$K_{n}^{U} = K_{n}^{L} + SF_{n}^{max}$$" style="width:122px;height:18px;"></p><p><img src=