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I'm trying to analyze a composite shell of a light aircraft fuselage. There are some layers - UD reinforcements in the shell of fuselage, that should follow certain path on the shell. So the layer coordinate system should rotate with the tangent of path - 3D curve. I saw a picture in a science paper, where micromechanics of a fabric lamina was analyzed in ANSYS. The coordinate system was following a centerline of a fiber.

Can anyone give me an advice how to do this? Thank you in advance.

Greetings,

Goran

Principle of virtual work in case of a large plastic deformation

Submitted by swsyoon on Fri, 03/13/2009 - 16:49

research

Hi, all

I have a question about FE formulation for a finite plastic deformation.

I'm a new on the ABAQUS, but how the ABAQUS deals with the plastic deformation

to solve the FE eqation? I think the software use the principle of virtual work and

I'm wondering how the software modify the virtual work term to take the plastic deformation into account (because of dissipation energy)

(Obviously, the formulation must be different with elastic model)

I appreciate your reply.

Continuity in the Plastic Strain Rate and its Influence on Texture Evolution

Submitted by Justin C. Mach on Fri, 03/13/2009 - 14:34

Classical plasticity models evolve state variables in a spatially independent manner through (local) ordinary differen-

tial equations, such as in the update of the rotation ﬁeld in crystal plasticity. A continuity condition is derived for the

lattice rotation ﬁeld from a conservation law for Burgers vector content—a consequence of an averaged ﬁeld theory

of dislocation mechanics. This results in a nonlocal evolution equation for the lattice rotation ﬁeld. The continuity

Estimate of Burst Strength of Dents in Pipe

Submitted by Kayode J. Ijaola on Fri, 03/13/2009 - 13:46

education

Hi all,

I am a master student doing an analysis to estimate the burst strength of dented pipes, I have been able to model the indenter and pipe. I did a non-linear analysis to create the dent but my problem is how to remove the indenter and apply pressure to come about the burst. please how do I achieve this kind of analysis. I would be very grateful to contributors and examples that would help me solve the problem. The model is being done using ANSYS 11.0

My email is ijakay [at] yahoo.com.

My Eprint papers

Submitted by Pi-Gang Luan on Fri, 03/13/2009 - 12:41

research

Hi,

These are my Eprint papers. Some have already been published as Journal papers, some have not.

I will discuss some of them here someday.

You can link to http://arxiv.org/ and search my name Pi-Gang Luan in Physics [arxive: All], and these papers would be shown to you. There is an exception, my YBE paper ([Colored solutions of Yang-Baxter equation from representations of U_{q}gl(2)] ). In that case you should type [Pi-Gang Luan] instead of Pi-Gang Luan to find the paper.

My Chinese blogs and My Photonic Crystal Book

Submitted by Pi-Gang Luan on Fri, 03/13/2009 - 11:59

Hello,

If you can read Chinese, you can visit my Chinese Blogs as follows.

http://www.blogtw.com/blog.php?user=pgluan

http://tw.myblog.yahoo.com/pgluan2005/

Besides, I and my colleague (Prof. chen) published a Photonic Crystal book: "Photonic Crystals -- From butterfly wings to nanophotonics" in 2005.

Notes on Implicit Update for Bergstrom-Boyce Network B

Submitted by Amit Acharya on Fri, 03/13/2009 - 10:10

education

This post is in response to the imechanica request

node/5034

(a separate post, as I have to attach notes - it would be really nice to be able to attach documents to imechanica comments)

Attached are hand-written notes I have used to implement the Network B for the Bergstrom-Boyce model. They were written for my use only, so if it seems stream-of-consciousness at times, don't blame me. The details should all be there, though.

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