different abaqus version behavior

[amar]

Hi,
I have a problem I in explicit, large def.contacts, hyperelastic material. I ran it in abaqus 6.4-4 and got it to work. Now the same problem, same input file same everything ran it in abaqus 6.5 and it aborts with large distortion of elements. I was wondering why that would happen and if anyone has experienced similar problems?
amar

[Jorgen]

That sounds like a really annoying problem! I have not noticed anything like that with V6.5. It sounds like you might have discovered a bug in V6.5.

I recommend that you submit your question together with the input file directly to ABAQUS. They should hopefully be able to figure out the problem is :wink:

Jorgen

[hhspiny]

That sounds like a really annoying problem! I have not noticed anything like that with V6.5. It sounds like you might have discovered a bug in V6.5.

I recommend that you submit your question together with the input file directly to ABAQUS. They should hopefully be able to figure out the problem is :wink:

Jorgen

My past experience with abaqus have been quite good. I reported two bugs to abaqus before and got confirmation in a few days. the recent one with cohesive element got confirmed with several hours. however, since contact and hyperelasticity model have not gone through much improvement from 6.4 - 6.5. on the other hand, the damage models and cohesive elements have many bugs, took me quite sometime as I always suspect I did something wrong first.

[amar]

Hello,
I talked to abaqus support. But I dont think they have any solution as to why the analysis wont work in 6.5. One solution was to change the default HOURGLASS=ENHANCED in 6.5 to STIFFNESS but that also did not work. One more thing was that I have the 'NO SEPARATION' on between the hyperelastic material and other componets, that might be causing a problem in 6.5. Taking that off the problem works but the results (seen from the deformation plot) are wrong.
I am not sure why the problem works in all ways in 6.4-4 and not in any way in 6.5.
amar