problem with contact and thermal expansion

[pitizone]

Hello,

I'm a new user of this forum and I write this message because I don't use correctly contact in my Ansys analyse.

Indeed, I want to study the effects of thermal expansion of a first part on a second part. Initially, there is a gap between the two parts. The problem is that I don't managed to adjust the stiffness and the penetration:

*If the stiffness is low enough, the analyse converge but the first part cross the second.

*If I increase the stiffness, the contact converge but the expansion is not stopped by the contact. The penetration is too important.

*If I continue to increase this parameter, the analyse no converge.


Is there anyone to help me to adjust the parameter to have correct results?

thanks
Jérôme

 

[pitizone]

I ask a new question:

In fact, I want to know if the normal stiffness is proportional to the apply load? and is there any calculation to know approximately the value of this parameter ? (because in Ansys help, we don't know how this value is used in the resolution).

(I used contacts with thermal expansion; the loads (due to the expansion) are maybe too important)

thanks for your help
jérôme