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  • Users: slimjimmy
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  1. slimjimmy

    5 cutbacks at start of new step - cutback reason "material point calculations"

    Hi everyone, I'm running a analysis with 4 forming steps. The model runs fine up to the 4th step. At the start of the 4th step, I get 5 cutbacks on the first increment. In Job diagnostics the cutback reason is "material point calculations". To debug, I have added in dummy 4th step with no...
  2. slimjimmy

    Python script - permission error in calling another python file

    Hi, I'm running a basic python script through the scripting interface in Abaqus. In the script another python file is called which operates on a element stresses previously outputted into a text file. The script runs fine on windows, however I have recently changed to Ubuntu and am now having...
  3. slimjimmy

    Modelling inflation of a sheet using Holzapfel (HGO) model

    Hi Everyone, I'm am preforming a simple analysis whereby I'm inflating a thin rectangular sheet of tissue using the built in Holzapfel (HGO) model. The sheet is constrained in 3 dof on three sides and unconstrained on the remaining side. A pressure load is applied to the inner face to inflate...
  4. slimjimmy

    Numerical problems associated with large differences in mechanical properties

    Hi Everyone, I am having difficulties running my models in abaqus. I think it is due to some mass scaling issues as I have large differences in mechanical properties between different parts of my model. Can someone help me out with some insight/documentation that can explain numerical issues...
  5. slimjimmy

    Connecting two nodes togther

    Hi Guys, I am running an analysis to attach two nodes togther. In step 1 I am displacing a node X to a Node Y such that both are in the same position at the end of the step. In the second step i want to tie constrain them such the if I move node Y node X will be attached and follow it. I have...
  6. slimjimmy

    Mass Scaling ABQ/Explicit Artery-Stent contact

    Hi Everybody. I'm modelling Nitinol stent crimp and expansion into an idealised artery in Abaqus/Explicit. I am having numerous problems with the ratio of kinetic energy to internal energy with the analysis. I was hoping somebody may provide me with some insight on this. I am modelling the...
  7. slimjimmy

    Unwrapping a stent cylindrical mesh

    Hi Guys, I have a stent (cylinder like) mesh and I want to edit some features. Does anybody know of a way to "unwrap" this mesh from its cylinder like form to a planar form. Any help would be great cheers
  8. slimjimmy

    Applying Boundary condition to a node in an input file

    Hi Guys, How do you apply a boundary condition to a specific node in an Abaqus input file? When an input file is generated a set is created for each node. Here is an example ** BOUNDARY CONDITIONS ** ** Name: BC-1 Type: Displacement/Rotation *Boundary *_PickedSet5, 1, 1, 0.1 *_PickedSet5, 2...
  9. slimjimmy

    Applying nodal displcaments from one mesh to another

    Hi Guys, I have two mesh models, one in a reference unloaded geometry and the other in a loaded geometry. I want to add a further part to these meshed models such that i can look at the stress on this part due to the deformation of the previous meshed part. However the problem i have is...
  10. slimjimmy

    UANISOHYPER STRAIN help

    Hi Guys, First time poster here. Im writing a UMAT to implement the fung elastic model into abaqus. The equation is U=c/2(e^^Q -1) and Q is int terms of the material coefficients of the strain components Eij. Im using the UANISOHYPER Strain in abaqus, and what i need to define is U - the...

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