This is the same (ongoing) assembly analysis I posted about before. See the attached image to see my setup. There are two parts in this assembly: the main outer tube (plastic) and the inner tube (steel) which you can see from the purple contact feature outline & its end sticking out the back of the left side of the image. The inner tube is a simple cylindrical tube. This analysis ran fine before I added that spring, which is attached from the top of that circular edge on the plastic part, to ground. I put 1 lbf/in for each of Kxx, Kyy, & Kzz (just as a starting point). Any ideas?
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