For surface supports, this option is only available if a nonlinearity in the local z direction has also been defined (failure if contact stress in z is negative/positive). In the dialog box where you can edit the nonlinearity, you will find the "Friction in plane xy" option.
This option works as shown in the graphic dialog box: The support in the x and y directions is fully accepted only when reaching contact stress Tau (contact stress Sigma multiplied by the friction coefficient). It is necessary to reduce this linearly in advance.
Therefore, in order to use this option, a support must nevertheless be defined in the horizontal directions. It can be defined as fixed or with an elastic spring. If the spring is defined with 0, no support is considered even though a friction coefficient has been entered.
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