Contact + preload result in very less displacement

Mintu

I performed a linear static analysis in a simple bolted,

I established 500N preload and at the interface i gave 0.1 static friction in property type,

I did 3 load setups one only with pretension, another with only external load and another with STATSUB(PRETENS) calling the pretenion case,

I requested ELFORCE on bolts and CONTF in the interface region,

The contact force is all good i applied 500N preload and the contact force is 350N

but the axial force in all 2 load case remained same 500N except for only work load and the displacement i got in only pretension case 1.03E-06,

but when i tried the case without any contact between plates,

I got the displacemnt 0.2mm good,

axial force in pretension = 500

axial force in workload = 63N

axial force in workload + statsub(pretens) = 563N

what is happening with contact,

I want an friction contact at the interface

bh2m_herve

hello Mintu,

please clarify:

"

but when i tried the case without any contact between plates,

…

what is happening with contact,

I want an friction contact at the interface "

As an alternative you can run a single setup with all loads at once.

Kind regards.