hadi's blog

Hello everyone,

I have a basic question in ABAQUS. For developing a user element in ABAQUS, the strain-displacement tensor, or the so-called B-matrix, needs to be calculated in the UEL subroutine. Applying the B-matrix on the displacement vector gives rise to the strain vector. However, we know that there are more than one strain measure for corresponding, or in other words, different conjugate stress measures.

 What is here not clear for me is what type of strain tensor is calculated by applying B on the displacement vector: (eps=B.d) what is eps here?

Hi,

I have written a user material for Abaqus to simulate the behavior of trabecular bone in large strain compression. The model undergoes elastic and plastic deformation. In the plastic regime, hardening and damage are growing depending on cumulated plastic strain.

Dear iMechanica users,

If you are concerned with user subroutines in ABAQUS, the link below may be helpful:

http://openpdf.com/ebook/umat-abaqus-example-pdf.html

Best, Hadi

Dear iMechanica users,

I would like to write a UEL for 2 or 3D element types used in large deformation, but, I really have little experience in it. Is there any UEL example apart from the simple 1D example in Abaqus manual and the complicated one written by Eugenio (XFEM)?

Thanks,

Hadi

Dear all,

I intend to read the element sets which I have in my Abaqus input file from the user material code (UMAT) and check to which elset the current element, which is characterized by "NOEL" in the UMAT, belongs.

Best,

Hadi

Dear friends,

Dear all,

in order to access the last value of my state variable SDV at specific integration points and specific elements, I need to write the SDVs into .fil file in order to be able to read them inside my UMAT at each time increment.

I use the subroutine DBFILE to read the .fil file; the keyword to access the state variables is "5", but I don't know how I can go to the value which has been already written to the current integration point.

Could anyboby help?

Thanking in anticipation,

hadi

I intend to create a
composite model, containing a cylindrical fiber surrounded by a cube, by Abaqus CAE v 6.7-1. I create
two separet parts, one for the cube and the other one for the cylinder. Then, I
cut the cube by the fiber; the third part (lets say the cut part) is created
automatically. Now, I need to mesh the parts and merge them.