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simple composite plate. 'too many attempts made for this increment'

simple composite plate. 'too many attempts made for this increment'

simple composite plate. 'too many attempts made for this increment'

(OP)
Hi I am modelling a 16ply (45/0/-45/90)2s laminate in Abaqus and am having real trouble getting to a solution under very simple loading conditions. I have simply fixed a flat plate of the laminate at one edge and then attempted to apply a force at the other end.

Under no loading conditions have I been able to converge to a solution. (pressure load, distributed load, point load)- I have tried to lower the load to very small so that the plate would not be undergoing large distortions..

I get the error..

'Too many attempts made for this increment'

whereby in my message log, the solver has tried for smaller and smaller increments from 1 to 1x10-5; and none of them converge.

My mesh is very fine.

I have experience with Ansys but never Abaqus so I am quite new to this software. I think I am doing something fundamentally wrong to be consistently getting this error message. Any suggestions for rectifying this problem I would be v grateful!

Luke

 

RE: simple composite plate. 'too many attempts made for this increment'

Do you have the plate's edge constrained in all 6 DOFs?  What type of elements are you using?  Try fixing all edges and applying the pressure load and see if it solves.  I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

RE: simple composite plate. 'too many attempts made for this increment'

(OP)
Thanks for your reply Rob. I had modelled a quarter of the plate and applied X-symmetry and Y-symmetry boundary conditions. I am using continuum shells with SC8R elements.

I have since realised my problem... I applied my X-symmetry where my Y-symmetry should have been and my Y-symmetry where my X-symmetry should have been! An embarrassingly simple mistake.

I am now moving onto modelling progressive failure; my plate is in tension now with a hole in it and I am trying to make it so failed elements are deleted and then the load reapplied.

Thanks

Luke

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