![]() For the Arc-Length control method, it is used internally to estimate an initial incremental value for the arc length. For the Force and Displacement control methods, it is used to progressively increment time from Start time to End Time. The time increment in the Solution tab is interpreted based on the control method selected.Time values are always real for nonlinear dynamic studies.Time values are pseudo values unless: 1) you are using material models with creep effects, 2) you are considering thermal effects from a transient thermal study. The Start time and End Time specified in the Solution tab, in seconds, are not used by the Arc-Length control method.To select the Displacement or the Arc-Length control method, click the Advanced Options button in the Solution tab.In other words, all loads are changed proportionally at each solution step. ![]() The Displacement and Arc-Length control methods calculate a multiplier for all loads at each solution step. The Force control method allows you to control each load and restraint individually by a time curve. The interface uses the Force control method by default as it is the proper choice in most cases. Nonlinear analysis requires specifying a solution control method.Nonlinear studies are solved in the time domain. When defining a nonlinear study, you can choose a static or dynamic study.
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