June 12, 2020 at 4:45 pmrafidison23Subscriber
June 19, 2020 at 8:57 pmWenlongAnsys Employee
First, sorry about the late reply. I just saw your post.
To get started, you can look into the "static and dynamic frictional coefficient" and "frictional decay". The information can be found here: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/ans_ctec/Hlp_ctec_realkey.html%23africtioncoeffjjs62101229
This is a quite long page, but once you go to that page, search " 22.214.171.124. Static and Dynamic Friction Coefficients" and you will see the relevant information. I will come back to you later with an example.
Note that in order to create some friction, you will need to make the diameter of the cylinder slightly larger than the hole.
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June 24, 2020 at 5:41 amrafidison23Subscriber
Thank you very much for your reply, it's very helpful.
Where can I define FACT (or MU)? I know the experimental value of TAUMAX therefore FACT. I obtained the value of T-max by introducing µ in my simulation and by slightly increasing the dimension of the cylinder as you advised. However, the descent is not what I expected. Should I use a command for MU or FACT entry? if yes, could you tell me how to write it in the command?
June 26, 2020 at 1:01 pmWenlongAnsys Employee
Please see below. You can use RMODIF to change the real constant of contact element. Meanings of real constants are shown in this page: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/ans_elem/Hlp_E_CONTA174.html.
In the RMODIF command, the first input "cid" and "tid" are the contact and target element identification number, the second input is the real constant number, and 9 means the 9th real constant, the last input is the value you assign to that real constant.
June 30, 2020 at 11:39 amrafidison23Subscriber
Thanks a lot for your response.
I followed your advice and have a drop but I still have a little problem. Indeed I modelled a hole (d=0.349mm h=1mm) and a cylinder (slightly larger than a hole 0.35mm) then apply a displacement (1mm). The bond must be maintained until TAUMAX (7.3MPa) and drop to 2MPa after the same.
I introduced µ=0.1 then in the (APDL) command TAUMAX (9), FACT(21) and DC(22) as follows:
RMODIF, cid, 9, 7.3
RMODIF, cid, 21, 3.65
RMODIF, cid, 22, 0
RMODIF, tid, 9, 7.3
RMODIF, tid, 21, 3.65
RMODIF, tid, 22, 0
I expected to have the same value of TAUMAX in my results but it is not the case. The result seems to be inappropriate and changes enormously as soon as I change a parameter (mesh size for example). Have I entered my command correctly?
July 1, 2020 at 3:40 pm
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