Problems with self contact
Problems with self contact
(OP)
Hi,
I'm tring to model a forging process with ABAQUS/Explicit, but I've got a problem with self contact (or maybe surface définition). one surface of the elastic-plastic material is schrivelling up during the simulation and after a certain elapsed time one of my boundary node is moving inside the matérial, making the simulation failing.
I defined my surface like this (I aslo tried without the internal surface, without succes, and my elements are CAX4R):
*Elset, elset=S1, instance=lopin, generate
1, 150, 1
*Elset, elset=S1_int, internal, instance=lopin, generate
1, 150, 1
*Surface, type=ELEMENT, name=S1
S1_int, S1
The contact is defined with:
*Surface Interaction, name=contact
*Friction
0.2
*contact Pair, interaction=contact
S1, S1
Any advice would be very appreciated, thanks in advance!
François.
I'm tring to model a forging process with ABAQUS/Explicit, but I've got a problem with self contact (or maybe surface définition). one surface of the elastic-plastic material is schrivelling up during the simulation and after a certain elapsed time one of my boundary node is moving inside the matérial, making the simulation failing.
I defined my surface like this (I aslo tried without the internal surface, without succes, and my elements are CAX4R):
*Elset, elset=S1, instance=lopin, generate
1, 150, 1
*Elset, elset=S1_int, internal, instance=lopin, generate
1, 150, 1
*Surface, type=ELEMENT, name=S1
S1_int, S1
The contact is defined with:
*Surface Interaction, name=contact
*Friction
0.2
*contact Pair, interaction=contact
S1, S1
Any advice would be very appreciated, thanks in advance!
François.





RE: Problems with self contact
While I was trying to solve my problem I ran the example problem "ale_sinusoid_forgingaxi" (contained in Abaqus example problem manual, section 1.3.9) to see how it was defined. Exactly the same problem happens at the end of the simulation if I divide de velocity by 10 and multiply the simulation time by 10.
Could someone explain me why some nodes/elements don't react correctly in this case?
I've made a lot of attempts to solve this, without succes, and my work is blocked...Thanks in advance!
François.
RE: Problems with self contact
Regarding your contact problem, you could look at using general contact rather than the contact pair algorithm. Look at *CONTACT and *CONTACT INCLUSIONS.
Good luck!
Martin
RE: Problems with self contact
Martin
RE: Problems with self contact
Still trying to understand why the "ale_sinusoid_forgingaxi" failed, I just tried to divide the analyse in two steps (I was only using one step), specifying the option op=new for adaptive mesh, and I got a solution!
So maybe it will work for my work... I'll give news soon, it would maybe be helpfull for others.
Thanks anyway, Martin,
Francois.