Time Stepping
Time Stepping
(OP)
I am trying to stretch an oring over a rod and then compress the oring. I figured out how I could stretch the oring by tapering the begining of the rod but now I want to compress the oring and I am having a lot of problems (mostly the fact that I don't know what I am doing). Is there a way to have Cosmosworks 2005 solve restraints in a given order. I need the Oring stretch to complete before the compression. Thanks in advance.






RE: Time Stepping
If you say compress - do you mean compress in a radial direction (i.e. flattening)? or, do you mean self-retracting into an o-ring groove?
Anyway, if like Cosmos DesignStar, I guess you might want to use different timecurves associated to different restraints. E.g.: One timecurve could already reach its peak value of 1 at time=0.5 and then stay high untill time=1. The other timecurve could first stay low and only start rising from time=0.5 onwards to reach its peak at time=1.
Gert
RE: Time Stepping
I have been trying to adjust the time curve but it seems to have no effect on the model. I want one thing to reach a destination before the second thing comes into contact with it and I just cant make it happen. It is a non-linear study of an oring that requires a preload. I want to stretch the oring to fit over a rod and seat onto a surface perpendicular to the rod face... Then I want another face that is perpendicular to the rod to come into contact with the oring and compress it to a given %. The Oring never seems to get into place before the second perpendicular surface gets to it. Any suggestions???
RE: Time Stepping
I do not know how familiar you are with your software and this type of analysis. So, forgive me if I am mentioning stuff you already checked...
If a component has to stay at a certain position, you need to keep the timecurve high till the end of the analysis time. The analysis end time needs to correspond to the max time on your timecurves. I assume you did actually assign the relevant timecurve to each restraint, and you are using a 1 to 1 scale factor to view the results.
RE: Time Stepping
RE: Time Stepping
Thanks for the feedback, now we all know.