setting simulation recroaching together bolted

[tailele]

Good day, I've had the need to work with ansys lately, and for this reason I started to perform some simple static verification (to initially take hand) , coming from a different software (star ccm+ ). Currently changing work, it was necessary to take hand with ansys that I had got to use it sporadically at university. In particular I wanted to ask for advice on a simplified verification of a model that I currently (for educational purposes) have in charge.
the model is symmetrical long x and z, so I set the symmetry constraints with the orthogonal axes; following the fourth model for the simulation of the bolt element I simplified the bond of the bolt and nut , set the dado-bullone contact type no separetion , ametric contact with bolt thread (by setting of primitive diameters and step ) ; set the axistra contact plate to finish setting the analysis set in 2 step where as first step go preload the bolts, and as second step block the preload and insert the force. for simplicity I insert an image of the study. I very gladly accept suggestions to get a correct way of proceeding if you feel the incorrect set, or the incorrect set constraints. Thank you in advance for your collaboration. Good job

 

[tailele]

Good day, I've had the need to work with ansys lately, and for this reason I started to perform some simple static verification (to initially take hand) , coming from a different software (star ccm+ ). Currently changing work, it was necessary to take hand with ansys that I had got to use it sporadically at university. In particular I wanted to ask for advice on a simplified verification of a model that I currently (for educational purposes) have in charge.
the model is symmetrical long x and z, so I set the symmetry constraints with the orthogonal axes; following the fourth model for the simulation of the bolt element I simplified the bond of the bolt and nut , set the dado-bullone contact type no separetion , ametric contact with bolt thread (by setting of primitive diameters and step ) ; set the axistra contact plate to finish setting the analysis set in 2 step where as first step go preload the bolts, and as second step block the preload and insert the force. for simplicity I insert an image of the study. I very gladly accept suggestions to get a correct way of proceeding if you feel the incorrect set, or the incorrect set constraints. Thank you in advance for your collaboration. Good job

I think that the Commission will be able to take the necessary steps.
1- I expected a slight bending of the unloaded beam and instead from the graphics you do not see
2- I don't understand why I know an abnormal shift of bolts coming out of the seat

I attach an image to show the situation. probably some contact is wrong.

 

[lucadileta]

hello suit, the fact that bolts get out of the seat is due to 99% to an error in contact settling, check the mesh around them and study the quality. contacts in ansys do not guarantee the contact at 100, excuse me the turn of words, in fact in those areas the knots must be placed in an acceptable and in sufficient number to allow the software to do its work.