I made a simple model of bar elements and in the midle I used on an element 1000 N bolt preload and constrained both ends. After running the analysis I created freebodies:
All reaktion forces and internal forces are 1000 N except of element with bolt preload. On this element I got 12000 N (in reversed direction).
What is this 12000 N, which value?
I attached the model too.
nobody know answer to my question?
I made many analyzes in which I got irreal values of internal loads with help of Freebody, last time in Femap v11.4.2.
For example in test model of my previous post the internal load is -12000 N according to the Freebody and the Bar EndA Axial Force is 1000 N (rounded) on this element:
I get the same result, you need to play with FREEBODY CONTRIBUTIONS from Peripheral elements & Freebody elements: