How to treat unloading step 1

[tsukuba]

I am just starting to use ANSYS. I want to simulate indentation cycle of loading and unloading. But I don't know how to use ANSYS in the unloading step. Should I superpose a problem of loading at max load with another problem of opposite load?
Your suggestions or comments are highly appreciated.
Thanks in advance.

 

[yogeshb]

To simulate unloading, you have to create another load step file with load = @zero. Solve the solution for your earlier and this new load step.
I would suggest to do this trial on simple problem before applying to actual case.

Hope this will help you.


Regards,
Yogesh Birari

 

[tsukuba]

But I cannot understand the meaning of load = @zero in the last response. For example, if I do a trial for elastoplastic
problem of a cantilever beam with an end load, how can I create the unloading step file?

Many thanks

Tsukuba

 

[tsukuba]

It is greatly appreciated if you can give me a command line file for a simple problem such as cantilever or something else.


Thanks.

 

[tsukuba]

I think I got it.
If load=P for loading step, the load in unloading step should be load=0, not load=-P.
But why cannot I find any explanation in ansys documents?
Did everyone have to do a lots of trials to understand this point?!!!

 

[dericcio]

Hi I have realized a similar problem, but adding a load step with no loading ansys automatically fix every node so I had to erase in the load step file *.s03 ... the rows that constrains nodes. Ansys had given me a solution but I havn't evaluate it yet.

 

[tsukuba]

Hi,dericcio,
Would you mind to share your successful experience with a ansys newbie?
Although I understand how to treat the loading and unloading, the convergency to simulate my
indentation problem is very bad.
I like to hear your message more, if you have a similar problem.
Thanks.