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Can a UMAT be reseased as Open Source (GPL) ?

Submitted by Louis P. Gauthier on
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(Question tranfered from previous blog post)

Dear iMechanica members,

Can ABAQUS or other commercial software's user material be reseased as open source code? GPL for example? If so, whith the multiple licenses proposed, which one would be most
suited for releasing vumat source code. The intent is simply to make
this vumat available to as many people as possible without anyone
taking undue ownership of the material law. Also, would there be any concerns about publications or articles concerning said material law once the source code is public?

strain field measurement

Submitted by schuffe on
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strain field measurement

HI,

i am looking into strain field measurement for coupon tension tests for
the purpose of correlation to fea results . a collegue told me that
there is an open source project

which calculates strain field from camera images. does anybody know something about it?

Cheers,

schuffe

Tsai-Wu Fc with Ansys

Submitted by Dimadima on
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ansys

Good evening,

in the order to perfom a calculation of Tsai-Wu Fc in Ansys there are two fundamentally different methods:

1. with the help of nodal stresses.

2. or with the stresses from the element table.

I want to know what is the difference, and which method, according to your experience is the best.

Thank you very much!

Concrete Damaged Plasticity

Submitted by looyong on
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research

Hi, I am currently trying to model a RC connection and I am using Concrete Damaged Plasticity, CDP, to model my concrete. WIthin this model, you would need to specify the tension damaged against strain or displacement. I have looked through the literature, there are many papers that talk about the damage, but they do not show how the tension damage was obtained.

0 Thickness Cohesive Zone Modeling

Submitted by henryjamesusa on
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Hi friends:

This is Henry, a graduate student in USA.

I am recently trying to model a 0 thickness cohesive zone with curvature and I realize that by using mesh edit.

When I made it and submit the job, the ABAQUS always told me the node numbering has a problem and thus abort the job.

Does anyone who has experience with that?

Thanks.

Henry.

Analytical Field definition in boundry condition

Submitted by tahsinopoz on
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research

 

Hi Dear iMechanica followers

I came accross a problem when defining displacament boundry conditions. I have been modeling cutting simulation in micron size. so I need to define tool cutter path in a circular shape. I mean cutter should follow the circular or parabolic path not smooth line. To do this I am trying to define analytical distribution in boundary conditions but it doesnt work. I attached the shematic picture of my job of  what I want to do. please look out the attached pdf file and send me your suggestions.

 Thanks in advance

Geometic non linear problem for deep truss element

Submitted by bruno-page on
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Hi,

Anyone, has read these lecture notes:

http://www.colorado.edu/engineering/cas/courses.d/NFEM.d/NFEM.Ch08.d/NFEM.Ch08.pdf

I've programmed FEM analysis for a deep truss element-but find my assembled stiffness matrix after application of boundary conditions singular--

My question is, whether can we apply above stiffness matrix (as in the chapter) for a truss as shown in the attached figure (jpg file)?

plz help

Postdoctoral Research Associate at the University of Massachusetts Amherst

Submitted by ashwin on
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nanomechanics
density functional theory

A postdoctoral position is available starting immediately in the area
of mechanics and electronic structure of graphene. The ideal candidate
will have a background in materials science/computational
physics/quantum chemistry with specific expertise in density functional
theory and atomistic simulations. The initial appointment will be for a
period of two years, renewable annually contingent upon satisfactory
performance

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