Most cases will produce a tetrahedral mesh. Contact areas give accurate representation of bolt head and nut contact area to flange. Good geometric representation of stiffness of bolt/nut will be captured if mesh is dense enough. Bolt model 1: Key features of this approach: Analysis settings: – Upper / lower flanges fixed at pipe OD – 2 step (load/lock ). linear analysis – 500N pre-load to all bolts 9 © 2011 ANSYS. Upper / lower flanges are multi-body.Overview of model. each has a different method of modelling the bolt release any temporary restraining boundary conditions – Step 3: Apply in-service loads 8 © 2011 ANSYS. Three step analysis: – Step 1: preload by load or adjustment – Step 2: fix the pretension. Mesh – Minimum DOF for best representation – Consider contact areas for load transfer/stress – Hex / tet. May 28.Model and analysis considerations Approach to modelling the bolts usually involve making engineering decisions about the following: No stress detail in flange Beam Connection + Easy to set up + Low computational time + No geometry required. Beam connection Solid Body + Most accurate + All contact details available + Easy post-processing. 2014 Line Body + Easy to set up + Low computational time + Some post-processing tools. High computational time 7 © 2011 ANSYS.Bolt modeling Bolt can be modeled as. In the following slides following aspects will be considered: – Geometry – Meshing – Contact – Pre-tension loading – Post processing 6 © 2011 ANSYS.Bolt modeling To demonstrate different ways to model bolts. It also explores examples and best practices and explains enhancements in ANSYS v15 3 © 2011 ANSYS, Inc. #Guides ansys 15 full#
This presentation shows different approaches of modeling bolted connection using full 3D models to beam models. Bolted analysis is no different than any other FEA calculation. Basic requirements of a bolted connections are: – Bolt should transfer the load realistically across the connecting elements – Bolt must have adequate strength – Joint must remain intact – Connection must have adequate fatigue and fraction life. Bolted connections are common to many industries. 
Bolt Modeling - Bolt Modeling Method 1 – 3D bolt representation - Bolt Modeling Method 2 – 3D bolt representation - Bolt Modeling Method 3 – bolt thread contact - Bolt Modeling Method 4 – bolt thread contact - Bolt Modeling Method 5 – screw joint - Bolt Modeling Method 6 – line body representation - Bolt Modeling Method 7 – line body representation - Bolt Modeling Method 8 – beam connection. 
An overview of methods formodelling bolts in ANSYS V15 Dragana Jandric ANSYS Inc Technical Support EnginPresentedMay at28,the 2014 ANSYS Regional Conference Chicago © 2011 ANSYS, Inc.
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