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Load step: A load step is the top level defined over ¡§time¡¨, where solution options, loads, and BC are applied.
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Substeps: A substep is an increment of load within a load step. Substeps are used to apply the load gradually. Each substep is associated with a value of ¡§time¡¨.
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Equilibrium iterations: An equilibrium iteration is an attempt by ANSYS to obtain a converged solution for the given substep. Equilibrium iterations are performed for each increment of the load.