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Hello Everyone,

I'm trying to model an extended shear tab connection using ABAQUS 6.13-2, I've tried to model 4 connections and I compared the results I've got with the experimental work, and I noticed that the FEA is way stiffer that the experimental work, I have only one warning and it says "If significant clearance/overclosure exists between surface pair (assembly__pickedsurf579,assembly__pickedsurf580) and the master surface does not have rotational degrees of freedom, adjustment is recommended for correct enforcement of the tie constraint"

Hello,



I have a problem with a stacked colum of elastomeric membranes (natural rubber or silicone).



I am looking for a compression buckling criterion that applies for hyperelastic materials in presence of large deformations (up to 400%).



I've read about Haringx formula, that should apply for these materials, but I suspect that it is valid for small strains only.



My question is:



- is there a suitable buckling criterion for this case?

Help needed!! in Abaqus

I have UMAT written to update stress and material tangent components for a user defined material model. I need stretch ratio as an input for my material model. For this I am using deformation gradient from UMAT. Problem is, when there is constant strain (strain rate = 0), for example when material stretched to 100% strain (rubber) and then held at that strain for certain time to see stress relaxation, the deformation gradient should give the same value of 100% strain, but to my surprise this is changing. Can any one help me with this.   

Hello All,

I am trying to make a 2D shell layer on XZ plane. To capture buckling of shell layer with 3-point bending load, I am required to model a 2D sketch on XZ plane. Modeling this way I can use shell elements' bending degrees of freedom. But ABAQUS always pick defauly XY plane to start with. 

Does anyone know how to draw a sketch on XZ plane?

Thanks,

Jay Patel