If the base name is changed, it only affects how bolt labels are generated in Bolt Selection subnodes that are added later on. You may then, in particular, want to manually edit the default Bolt Selection subnode.
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For Pretension stress enter a value or expression for σp, the pretension stress in the bolt. The pretension force is computed through multiplication by the actual area of each selected bolt.
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For Tightening torque, enter the following data:
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The Nominal bolt diameter. The default is From geometry, in which case the bolt diameters are derived from the cross section selections in the Bolt Selection subnodes. To use another value, select User defined, and enter the bolt diameter, d.
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The Bolt hole diameter. The default is Automatic, in which case the bolt hole diameter is set to 1.1 times the nominal bolt diameter. To use anther value, select User defined, and enter the bolt hole diameter, dh.
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The Bolt thread mean diameter. The default is Automatic, in which case the bolt thread mean diameter is set to 0.9 times the nominal bolt diameter. To use another value, select User defined, and enter the thread mean diameter, dt.
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The Half thread angle, α. The default is 30[deg], which is used in for example the ISO and UTS standards.
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The Bolt head friction coefficient, μh. This is the friction coefficient between the bolt head and the material under it, including the effect of, for example, washers. The default is 0.15.
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The Bolt thread friction coefficient, μt. This is the friction coefficient between inner and outer thread. The default is 0.15.
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Modeling of Pretensioned Bolts: Application Library path Structural_Mechanics_Module/Tutorials/bolt_pretension_tutorial
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This section is present only in models created in versions prior to 5.3, in which the new Bolt Pretension study type was introduced. The purpose is to maintain backward compatibility for older models.
Select Solve in bolt pretension study only check box to make the bolt pretension degrees of freedom behave as in a version 5.3 model, that is being solved for only in a study step of the Bolt Pretension type. By default, the check box is cleared, and then the bolt pretension degrees of freedom are solved for in any type of study step, unless you explicitly suppress that.
The settings of the Solve in bolt pretension study only check box only affects new study sequences being generated. Existing study sequences will keep the current state for the bolt pretension degrees of freedom.
Once you select the Solve in bolt pretension study only check box, the Solver Suggestion section will be hidden. Thus, it is not possible to clear the check box again. The degrees of freedom created under this Bolt Pretension node from now on assumes the version 5.3 behavior.
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