Blog posts

In order to obtain numerical solution of problemsthat involves a hyperelastic material model, we use what is known as incremental/iterative solution techniques of Newthon's type. The basic idea is to contruct a discrete system of nonlinear equation, KU=F, and solving it using a Newton's method or a modified version of it. As we know, its lead to a systematic linearization of the internal force vector and by the chain rule to the linearization of the material model.

Picking a node within a 3D Solid Volume

Submitted by looyong on Wed, 12/16/2009 - 19:18

hi all,

I have a solid 3D part made of concrete. I would need
the results of a few points inside the concrete. However, I realised it
was not easy to pick them when doing a Set because the nodes are hidden
(they are not on the surface. I have 1) partition my model exactly at
the points when I need to pick 2) i name the points as datum points.

Using the CAE interface, how can i pick this nodes? I have attached a pic for better understanding. Can anyone please advise?

Thank you.

Project Tuva (Feynman's lecture series)

Submitted by Arun Krishnan on Wed, 12/16/2009 - 18:30

character of the physical law

Here is an interesting link I came across while searching for the Feynman lectures -- Project Tuva.

http://research.microsoft.com/apps/tools/tuva/

It provides each of Prof. Feynman's seven lectures delivered at Cornell as a part of the Messenger lecture series. This format of posting lectures by Microsoft is absolutely amazing. I hope more such lectures especially videos of keynote lectures in leading conferences and congresses can be made available online.

-Arun

solving equations

Submitted by uni_students2009 on Wed, 12/16/2009 - 11:10

Hello every one,

Please look at attach file and let me know your idea about solving this nonlinear system equations.

UEL, ABAQUS input file

Submitted by Schutter on Wed, 12/16/2009 - 09:20

Hi all,

I have created a triangular element for abaqus, I did this in Matlab, compiled that to C, compiled that to an object file. When I run a simple script, where I do not use the element, but just say that user=userelement.obj, the system runs without a problem. When I change my input file as follows:

* user element, type=U3, nodes=3, coordinates=2, variables=31

*UEL PROPERTY, ELSET=ALL

1

*Element, type=U3

1, 1, 2, 3

Creep simulation - welded zones

Submitted by fayasserarafat on Tue, 12/15/2009 - 12:54

ABAQUS/CAE

User subroutines in ABAQUS

creep

I am trying to simulate creep damage in welded components in ABAQUS. I have four different sections in the same model assigned to four different materials. They are weld metal, base metal and Heat affected zones. I have to write a creep subroutine. For all the zones, creep equation is the same , but the parameters or constants change. i want to know how can I assign different parameters for different materials in the fortran source subroutine? what is the variable used for Material 1 , material 2 etc in standard ABAQUS?