Pre-stress on screw
Pre-stress on screw
(OP)
Hi all,
Regarding the way of establish pre-stress as follow:
Let the screw component (e.g. head or thread) penetrate into the connected steel sheets for a certain pre-calculated depth,
during the first load step, penetrated component will be pushed back due to the contact elements introduced earlier,
thus creating a compressive force between 2 connected sheets.
Is it practical, or in my concern, is it possible for most FE software? I am using LUSAS.
Thank you all in advance.
Regarding the way of establish pre-stress as follow:
Let the screw component (e.g. head or thread) penetrate into the connected steel sheets for a certain pre-calculated depth,
during the first load step, penetrated component will be pushed back due to the contact elements introduced earlier,
thus creating a compressive force between 2 connected sheets.
Is it practical, or in my concern, is it possible for most FE software? I am using LUSAS.
Thank you all in advance.





RE: Pre-stress on screw
The options will vary between software packages, depending on how much control they allow the user to have (I'm haven't used LUSAS, but it seems pretty capable). Often, hand calculations are sufficient for most bolted joints. For thinner flanges, things like flange waffling and the like may need to be simulated, but a simpler method may be sufficient. Personally, I think that using tension only elements with a specified initial strain seems clever.
RE: Pre-stress on screw
Would you mind explain the flange waffling? I think it would be useful for me, as my test subject also included thin-walled steel sheet.
RE: Pre-stress on screw
RE: Pre-stress on screw