Loads and Boundary Conditions

This section summarizes some remarks concerning loads and boundary conditions.

This page discusses:

Contact Boundary Conditions

Contact conditions are permitted in the analysis model for topology and shape optimization. Defining a contact surface directly on the edge of the design space is allowed in topology optimization. The shape optimization algorithm must be inverted (see command OPT_PARAM, parameter SCALE) if the design edge belongs to a contact surface in shape optimization. Convergence difficulties in the FE analysis might arise in cases of complex contact problems because of large changes in the model during optimization. The Use of Contact Boundary Condition Requires a Tosca Structure.nonlinear. License

Node Restrictions for Shape Optimization

Node fixations are not loaded during the loading of the analysis model. The boundary conditions (SPC = NR1 and SPC = NR2) are transferred to the optimization model by entering the command


OPTION
 READ_BC = ALL
END_

Node fixations are created in ANSYS® in the load files (*.sxx) of the analysis model with the following command, which we recommend:


D, NODE, Lab, VALUE, VALUE2, NEND, NINC, Lab2, Lab3, Lab4, Lab5, Lab6