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Nonlinear finite elements

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How to use the hybrid/mixed method to solve geometrical nonlinear problems?
It seems the the difficulties are how to choos strss(Cauchy, Lagrange or Kirchhoff ) and the corresponding expression of energy functional. When the large deformation is considered, the equilibrium equation is coupled with the displacements and the complementary energy is different with linear problems.

Orientation of Core-Shell Nanoparticles in an Electric Field

Coated nanoparticles, which have a core-shell structure, have many applications. The attached manuscript shows some of our progresses in investigating the induced torque and orientation of such nanoparticles in an electric field. We show that the shell of a nanoparticle has an important effect on its orientation, even when the shell is thin and takes only a small portion of the total volume. For instance, a thin layer coating of highly conductive Au can dramatically change the induced torque on a SiO2 or TiO2 nanoparticle.

Cohesive interface line element

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Dear  researchers,

I'm working with line cohesive interface element. It is been implemented  in Fortran Code. I have some doubts about it.

The first one is: this element will be coupled with shell element, but as the line interface element doesn't have degrees of freedom of rotation this could cause some problems. Someone knows a formulation to line interface element that incorporate rotation in formulation?

Lath martensite

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Does any one knows a good reference about lath martensite?

Why we see the retained austenite? why doesn't it transformto martensite? What's its effect on the phase transformation? Does the plasticity change the morphology of the transfromation? How about the speed of the transfromation? When should we expect to see the lath martensite? What's the effect of the diagonal terms in the transformation matrix? What's the effect of the shear components? Is there any difference between 2d and 3d simulations, and which one is more realistic?

Austenite Martensite transformation

Does any one knows a good reference about lath martensite?

Why we see the retained austenite? why doesn't it transformto martensite? What's its effect on the phase transformation? Does the plasticity change the morphology of the transfromation? How about the speed of the transfromation? When should we expect to see the lath martensite? What's the effect of the diagonal terms in the transformation matrix? What's the effect of the shear components? Is there any difference between 2d and 3d simulations, and which one is more realistic?

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Cohesive zone modeling

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I am trying to use cohesive zone modeling for bimaterial fracture in ANSYS, but I have some problem while inputing the data. Can anybody suggest how to use cohesive zone modeling in ANSYS.

Constant Stress across a Beam

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Hello,

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End Notched Flexure Problem

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Hi

I want to model an End Notched Flexure (ENF) specimen in ABAQUS for
studying the mode II fracture behaviour in laminated composites.

I have modeled the problem using shell elements and continuum shell
elements.

To prevent the two legs from penetration, I have examined almost all
of connector types (in ABAQUS/CAE) and also contact types but the
results have not been satisfactory.

At this moment I don't have any idea about what to do.

Can anybody help me in this regard?

Best Regards

Kamyar

ABAQUS ( viscoelastic material model)

Does any one know how to implement other viscoelastic material models, like Burgers' model, in ABAQUS? To my knowledge only Prony series can be used to model visoelastic materials in ABAQUS/standard. 

thanks,

Milliyon

ericmock's picture

Open Source Publishing Flow Chart Small

Small version

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ericmock's picture

Open Source Publishing Flow Chart

Here is my flow cart...

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abshaw's picture

Non-conformability in Mesh-free Methods

Can any one please tell me where to find some mathematical proof (or justification) of the non-conformability arises due to misalignment of background cell and the support domain in mesh-free methods based on Galerkin formulation.

 

 

Amit

Gang Feng's picture

Elastoplastic Indentation Stress Field

This model has a simple closed-form analytical expression, matching with finite element results nearly perfectly.

Ref: G. Feng, S. Qu, Y. Huang and W.D. Nix, An analytical expression for the stress field around an elastoplastic indentation/contact, Acta Materialia, V.55, 2007, P2929-2938. http://dx.doi.org/10.1016/j.actamat.2006.12.030

ericmock's picture

Open Source Publishing

I am putting together a proposal in response to NSF's Engineering Virtual Organizations solicitation regarding what I call Open Source Publishing.  The proposal can be found (and edited if you setup an account) here.  I would encourage you to register and edit if you're interested.  All revisions are saved so there is no risk of messing something up.  The proposal is fairly unstructured at this point and consists of mostly just my th

Arash_Yavari's picture

Discrete Fractal Fracture Mechanics

This paper extends the recently developed theories of fracture
mechanics with finite growth (mainly the work of Pugno and Ruoff, 2004
on quantized fracture mechanics) to fractal cracks. One interesting
result is the prediction of crack roughening for fractal cracks.

Nancy Sottos's picture

Self-healing materials with microvascular networks

Kathleen S. Toohey, Nancy R. Sottos, Jennifer A. Lewis, Jeffrey S. Moore, and Scott R. White

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Material Point Method

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Material Point Method (MPM):

Mimics Innovation Awards 2007 Winners Announced!

June 1st  2007, Materialise announced the winners of the Mimics Innovation Awards 2007 at the International Mimics User Group Meeting in Washington, D.C. 

We congratulate:

 

  • Category 1: Innovative implant design system & the development of innovative medical procedures.

Vos W. – University Hospital Antwerp, Belgium

Discusssion on Crystal plasticity

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Discusssion on Crystal plasticity
(1):How to establish a model which reflect the size effect in material
(2):How to form the finite element implementation of equilibrium field equation

I hope to have discussion with you in these topics
My E-mail: zhangxu26@126.com

Mechanical Threshold Stress model for 6061-T6 aluminum alloy

I have attached a copy of my McMat07 talk below.  The talk is about a modified mechanical threshold stress (Follansbee-Kocks) model that can be used for strain rates > 1000 /s and high homologous temperatures.  In the model, the pressure dependence of the flow stress arises from the pressure dependence of the shear modulus.  Even after using the most accurate models for the shear modulus (and the melting temperature) we find that the pressure sensitivity of the flow stress is underestimated by our model (by quite a bit).

How to assign tensile and compressive stress-strain curve in Ansys.

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Hi everyone

Peridynamic theory vs. classical continuum theory

Dr. Stewart Silling has provided me with a copy of his talk on Peridynamic theory that he presented at McMat 2007.  The PDF file of the talk is attached below.

In order to deal with classical material models and volume constraints, Dr. Silling has modified the original theory to allow for forces that are not necessarily pairwise. A bit on that is included in the talk.

BoJing Zhu's picture

Future of fracture mechanics

If possible,share your opinion (idea) about the future trend of fracture mechanics. Thanks!

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