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Level set methods

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Can someone suggest how to implement level set methods for advancing fronts ?

Ashfaq Adnan's picture

Need help: Relation between polymer end-to-end distance and mechanical properties

Hi,

I found in polymer books and some literatures that mechanical properties of polymer improve with the increase of their radius of gyration or end-to-end distance for a fixed molecular weight. I, however, could not find any experimental evidence or any physical explanation. 

It will be a great help to me if anyone refer me some literatures that explains the connection between these two parameters.

 Thanks,

Ashfaq Adnan

ErwanVerron's picture

Comparison of hyperelastic models for rubberlike materials

Dear all,

Infinity asked me for posting more information about one of our papers. It was published in 2006 in Rubber Chemistry and Technology and proposes a comparison and a ranking of 20 different hyperelastic constitutive models for rubber (from the Mooney model (1940) to the micro-sphere model (2004)) in the incompressible case.

Marckmann G. et Verron E., Comparison of hyperelastic models for rubberlike materials, Rubber Chemistry and Technology, 79(5), 835-858, 2006.

Unloading prony series (soft tissue)

Hello All,

 

I am new here. I was searching for long time to find similar topics (see title) but nothing. 

So, it may be good to ask here.

 

My question is:

 Is it correct (for soft tissue) that prony series from relaxation test can be used to model "unloading" part of a cyclic test? If it is yes Why? 

   

I thank you in advance

 

Best regards,

Sugeng

 

MD simulation VS. Continuum mechanical model Of protein

Hi, all

Molecular dynamics (or MC) is a powerful tool in the protein research. There're lots of scientific works in this field, which deepen our understanding gradually. My question follows, "how about the continuum mechaics in protein research".

Any discussions and advices are appreciated.

 

Kong    5th Sep 2007

 

Markus J. Buehler's picture

Brittle fracture down to femto-Joules — and below

I found an interesting paper on the arXiv website that may interest some mechanicians.  Markus

Title:  Brittle fracture down to femto-Joules — and below

Authors: J. Astrom, P.C.F. Di Stefano, F. Probst, L. Stodolsky, J. Timonen 

N. Sukumar's picture

Non-planar crack growth (X-FEM and fast marching)

In the attached manuscript, we have coupled the extended finite element method (X-FEM) to the fast marching method (FMM) for non-planar crack growth simuations. Unlike the level set method, the FMM is ideally-suited to advance a monotonically growing front. The FMM is a single-pass algorithm (no iterations) without any time-step restrictions. The perturbation crack solutions due to Gao and Rice (IJF, 1987) and Lai, Movchan and Rodin (IJF, 2002) are used for the purpose of comparisons.

Xuanhe Zhao's picture

Stretching and polarizing a dielectric gel immersed in a solvent

      This paper studies a gel formed by a network of cross-linked polymers and a species of mobile molecules. The gel is taken to be a dielectric, in which both the polymers and the mobile molecules are nonionic. We formulate a theory of the gel in contact with a solvent made of the mobile molecules, and subject to electromechanical loads. A free-energy function is constructed for an ideal dielectric gel, including contributions from stretching the network, mixing the polymers and the small molecules, and polarizing the gel.

Dynamic crack propagation

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Carl T. Herakovich's picture

Research Directions in Computational & Composite Mechanics

A Report of the United States National Committee on Theoretical and Applied Mechanics (USNC/TAM), June 2007  

Henry Tan's picture

interface cohesive energy

Many people here are interested in the behaviours of interfaces.

I am interested in having a list of the cohesive energy for interfaces between different materials, such as polymer/ceramics, polymer/metals, polymer/polymer, metals/ceramics, biological interfaces, carbon nanotube/polymer matrix, etc.

So, what is the magnitude of the cohesive energy per unit area of the interface you are studying?
 

Kejie Zhao's picture

A MD simulation of nano-void growth in Copper under uniaxial tension

Recentely we did a MD simulation work on the nano-void growth in Copper, welcome to my blog for any discussion..

Meshless methods

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 I want to study dynamic response of plates using element free galerkin method. But i have difficulty imposing essential boundary conditions. I have tried Chen's full transformation method. Can someone tell me how to impose essential boundary condition to solve eigen value problems?

FEMLAB-COMSOL Multiphysics

Hi,

I am a PhD student and I have just started to work on FEMLAB and was just wondering if someone could help me with FEMLAB. I am using at the moment the PDE modes-Weak forms to solve flow over topography using the lubrication equation. I have implemented the lubrication equations into the subsomain settings and set the boundary conditions  but i do get wrong results. Could you please advice where i might have done wrong.

Any suggestions will be really appreciated.

Many thanks

Catherine

 

Some loud (and crazy) thinking on automobiles...

At iMechanica, almost none talks about topics from structural dynamics and design, theory of machines, automotive mechanics, space mechanics, etc.

Let me help correct this situation by raising two questions below. Well-thought answers from any individual are welcome.

First, some background for the questions.

H-M coupled problem

Hello, I'm working in my doctoral thesis. I work in drying cracks in soils. At the moment I'm starting to implement my code but I want to start with simplest case.

My problem is high nonlinear and for this reason I need to solve for example flow in unsaturated porous media. Are there any code in matlab to solve nonlinear problems in 1D ? for flow in porouos media or for heat transmition it could be useful for me.

Thank you very much.

Varitional Methods

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Can we derive governing differential equations for bukling of plate and/or shell using variational principles ?

Zoeb Kaizar Lakdawala's picture

QUESTION REGARDING FRACTURE TOUGHNESS TESTING

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HI ALL


Actually I  am a Student of 2 year M. Tech. studying in S. V. National  Institute of Technology, Surat My name is Zoeb K Lakdawala. My topic for disseration is 'Implemenation of Fracture Mechanics on Pressure  Vessels". In my disseration I want to develop a code on fracture mechanics and compare it with standard Packages like ANSYS & ABAQUS.

Paris law coefficients for alumimum 5754-O and 6111-T4

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Dear all,

I am looking for the  coefficients of Paris law (C and m) for aluminum 6111-T4 and 5754-O.  Ii will be greatly appreciated if you can suggest some sources or data.

Best, 

composite materials

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Hello every body 

I am a novice (new one) on this web site and I just began, I am preparing my master on composites and I think that you have more informations than me on this subject my problem is that Iam in the coparative step between my results and the others.

my work is on the crack of composites mode II (sliding mode) I'm modelizing that phenomen with finit element to find the enegy of sustitution the problem is that I have not found any results by web and unfotunatly we have not books on this subject in my university.

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