Overview
In this example (Radioss deck attached in the *.zip file) the 3D bolt preloading or pretension is achieved using 1D spring element , /PROP/TYPE32(SPR_PRE).
The preloading magnitude and duration is set within the property /PROP/TYPE32 using a curve (of function).
As the /PROP/TYPE32 spring only has 1 DOF , in order to add the remaining DOF, and stiffness in these DOF's, it is recommended to add another spring, type /PROP/TYPE13 in parallel.
Please refer to the documentation of PROP/TYPE13 below, and the comment 10.:
https://2021.help.altair.com/2021.2/hwsolvers/rad/topics/solvers/rad/prop_type32_spr_pre_starter_r.htm
Also as recommended, the connection between the nodes of springs and each endo of the bolt mesh mesh is done thru rigid body element, /RBODY.
And when dealing with /RBODY, it is advised to connect the spring nodes as secondary node of the rigid body. And the main node of the /RBODY is not connected to any element.
Pre-Requisite
Run model on Radioss 2021 or newer.
Usage/Installation Instructions
Run as with with Radioss 2021 or newer
Post-Requisite
The result file *.h3d can be post processed with HyperView
and the time history file *T01 can be post processed with HyperGraph
