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When using Automatic, the computed orientation of the beam axis, ea, is indeterminate with respect to its direction. If needed, you can control the direction by selecting the Direction adjustment check box. Then, enter a vector giving an Approximate orientation, ea,approx. The positive orientation of the bolt axis will be chosen so that .
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For User defined, enter the bolt diameter, dp. Then enter the Orientation of the bolt axis, ea, and a Point on axis, P.
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In order to specify contact conditions like this, one or more Contact Pair nodes must be defined in the Definitions branch of the component.
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When a contact feature is present in your model, all studies are geometrically nonlinear. The Include geometric nonlinearity check box on the study step Settings window is selected and cannot be cleared.
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See also Simplified Modeling of Bolt Threads in the Structural Mechanics Modeling chapter for a complete description of how to model bolt threads.
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