In some model, when I add the mu of the slide base restraint, I find the force and moment of the nozzle of the equipment become very high.
I want to know what is the value of the mu of the support when you using CII?

better to ask for the meaning of life, do a search on this forum and you shall find all that you could hope to find

I usually use 0.1 for mu, but in some other software, this is no friction factor. So I want to konw if is need to set the value of mu, because the result is very different from don't set the value of mu?

There has been a lot of discussions here about Mu value. If you use the search botton (the one after 'login' and 'register') and search for "friction" you will possibly find everything that you want.

Another way is to e-mail your query to tech. support and not post here.

Considering that you may not be very experienced, the chances are that some will make insulting remarks if your question sounds trivial.

The coefficient of friction is a user entered value. Typically, 0.3 for steel on steel, 0.1 or 0.15 for slide plates. That's what I hear. But the actual value in the field can vary dramatically. In the right environment, I understand that mu can go greater than one.

Individuals and/or companies develop a "feel" for friction values (and a few other model/design uncertainties). Many firms ignore it.

My rule is to not allow friction to reduce response (load, stress, etc.). I would suggest running with and without friction and see how sensitive the results are to friction. If they are sensitive, spend more time worrying about it. If not, don't.

CAESAR II makes it easy to "test" different friction coefficients. We have that Friction Multiplier in the second tab in the static load case processor.

Hi
Come on Guru's I think you are here in this forum to Help people like GuangXu and help him of coming out of the problem.

I think You guys are doing a Good Job .
Please keep it up.