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Defining Ansys Superelement SUB File Manually

Photo by  James Owen  on  Unsplash A surprisingly popular blog-post written here is Exporting Stiffness Matrix from Ansys . A sensible follow up question is what can one do with the exported stiffness matrix? In a recent Xansys Forum post, a question was raised on how we can edit the stiffness matrix of a superelement and use it for our model.  An approach presented below is to first create a superelement that has the same number of DOF and nodal location that will serve as a template. An APDL script can then be written to edit the stiffness matrix entries as desired before exporting to a new superelement *.SUB file for use in future models. The self-contained script below demonstrates this.  /prep7 et ,1, 185 mp , ex, 1, 200e3 mp , prxy, 1, 0.33 w = 0.1 ! single element (note nodal locations) n , 1, w, -w, -w n , 2, w, w, -w n , 3, -w, w, -w n , 4, -w, -w, -w n , 5, w, -w, w n , 6, w, w, w n , 7, -w, w, w n , 8, -w, -w, w e , 1, 2, 3, 4, 5, 6, 7, 8 /solu antype , substr     ! analy

SpaceClaim - Eye

The Original Eye*

SpaceClaim has a pretty neat feature of being able to import pictures. This comes in useful when trying to compare a picture of a part cross-section to the CAD. Rough dimensional analysis can be done. To take it a step further, the model could be updated so that the contours match the cross section picture.

Other uses for it is to help 'inspire' CAD when the models are created from scratch. More accurate proportions and curvatures could be represented in the model. An example of which is shown below where the vitreous humor and crystalline lens of a Wikipedia picture was approximated.

The Scary Eye

We could insert the picture here:
Insert Picture File here

With the picture imported, it could be used as a background image for tracing splines to recreate key features. For example, two areas were recreated here:
Adding Splines to Create Areas

Another view of the model:
Areas at Different Plane from Picture

Given a bit more time finessing the initial areas and rotating it, the following volumes were created:
3rD Eye Blind

With that, a 3D eye model was modeled after a picture. It is a world better than having me create the volumes free-hand. Happy Halloween!

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