XANSYS Message: 168 [Go back to message list] [bookmark on del.icio.us]
No rating yet Subject: Stress concentrations Author: Brent Brower Date: 1999-01-11 11:12:00This is a problem that has bugged me in the past and I am now having trouble with it in a contact problem that I am working on:
I am analyzing a press fit of a "rod" into a hole. The rod that is pressed into the hole has circumferancial rings turned on it. The problem is that one of the elements on the edge of the rod where the press fit is occurring has a huge stress differential across it. Increasing the mesh density just increases the maximum stress at the node "touching" the hole wall. The stress is so high at the one element that when VonMise's stress is plotted it is red and the rest of the model is blue.
I have had this problem before, usually when constraining displacement. Using pressure loads instead of fixing displacement would work in the past, but since the stresses are caused by contact this is not an option.
Any help here would be appreciated.
The model is 2D axysemmetric, with plane 82 elements.
This is ASCII attempt to illustrate my problem.
000000 | 000000 | 000000 | Centerline is at the left edge. 000000000| "ROD" 000| 000000000| 000000 | 000000 | 000000 | 000000000| 000000000| 00000000X| High Stress at the X 000000 | 000000 |_______