1. Arbitrary system AR This type of specification can be used to model: any of the previously specified systems systems with complex topology not covered by the standard systems systems for which boundary conditions are not covered by SA-SD systems For this class of systems the topology must be described in detail. Boundary conditions corresponding to a 1) stress-free configuration, as well as 2) the wanted static configuration and parameters for a load incrementation procedure from 1) to 2) must be specified. The load incrementation procedure is specified as input to the STAMOD module. 1.1. Data group identifier ARBItrary SYSTem AR Standard system SD Control data