*MAP SOLUTION for non NLGEOM analysis?

[mrgoldthorpe]

I am carrying out an analysis where I'm mapping the solution from one mesh (Model 1) to different meshes (Model 2 etc.) of the same geometry. Cracks are then introduced into the latter. The analysis is not NLGEOM.

I'm finding that some regions of Model 1 are not located in Model 2, with the result that stresses etc. in those regions of the Model 2 are set to zero. However, the undeformed geometry of both meshes is in fact the same.

I suspect that this failure to map properly is because the *MAP SOLUTION facility assumes that the analysis is NLGEOM and so maps from the deformed configuration of Model 1 to the undeformed Model 2. Can anyone confirm that is indeed the case?

If so, any advice on how I can get around this in a simple manner?

 

[xerf]

I have never used *MAP SOLUTION, but...

I read about a code Zencrack that you might find useful.

http://www.zentech.co.uk/zencrack.htm

I think it is designed as an add-on to ABAQUS. Unfortunately, I do not have access to it so I am not able to detail.

I have just noticed that *MAP SOLUTION uses UNBALANCED STRESS, that is probably uses the same approach as for imposing initial stress states. As far as I know this approach relies on trying to enforce the equilibrium by 'adjusting' the user-supplied initial state of stress. When I tried it I ended up with zero stress, i.e. ABAQUS eliminated entirely the initial stress field.

 

[mrgoldthorpe]

Xerf, thanks for the reply. I don't have access to Zencrack so won't pursue that but continue along a pure ABAQUS route.

I'm actually mapping a field from a weld simulation to a variety of meshes (potentially) containing cracks in the same geometry. The field doesn't get eliminated in the new mesh. In fact, after the equilibrium step, it's a very good representation of the residual stress field in the old model in parts. However, some regions of the new model don't receive any stresses at all because I believe they lie outside the deformed configuration of the old model. The equilibrium step after the mapping adjusts things to restore stresses there; but I'm not happy with the overall mapped solution.

 

[xerf]

I think I remember reading that if the new mesh is outside the boundaries of the old mesh, the solution mapping does not work.

Would it be difficult to adjust the node coordinates in the new model to match the deformed mesh in the old model ?