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WaiChing Sun's picture

Shape of particles in DEM

Many granular materials encountered in engineering practice are of irregular shapes that are not essentially smooth or rounded. However, in DEM, grains are idealized as spheres and ellipsoids and their surface are assumed to be sufficiently smooth. As a result, I wonder why there is no model of  irregular shapes and what is the difficulty on implementing such a model? Is there any recent work aimed to simulate grains of irregular shape? Thanks a lot. 

MichelleLOyen's picture

Nanoindentation of Biological Materials

Recently published, this special issue of the Journal of the Mechanical Behavior of Biomedical Materials, dedicated to ‘Nanoindentation of Biological Materials' provides a snapshot of the novel uses on nanoindentation technology that is now readily available to researchers and expands the scope of existing techniques to optimize methods for biological tissues and related biomaterials.
Access the issue online:
http://www.sciencedirect.com/science/journal/17516161 (ScienceDirect subscribers)

A new idea and a not so new one

Two new papers grabbed my attention on my long unread list of journal tables of contents in Google Reader. 

1) The first was


Ideomechanics of transitory and dissipative systems associated with length, velocity, mass and energy
by G.C. Sih

where it is stated that

" One of the rules of the development of IDM is that the “flow of nature” takes precedent when deducting and/or constructing quantitative results. It is hoped that

huang peng's picture

Need the references of penetration into soil target

   I want to simulate the penetration into soil target, but I don't find the satisfied references about this simulation.The penetration into soil target will be simulated by the finite element method or meshless methods in my project. I think the good experimental results can verify the simulation.

   Can you give me some references of  penetration into soil target?

   Thank you for your help.

   

jin haeng Lee's picture

Problem of contact data in ABAQUS 6.8 version

Hi.

I have an issue related to recent change in ABAQUS new version.

 I've recently found a problem related to cotact data in ABAQUS new version, 6.8. I use fil files, but I've heard from a Simulia engineer that data file also has the same problem (I have not checked it out yet.)

User subroutines in ABAQUS

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Dear All,

Could you suggest any literature or online step by step tutorial on how to create your own subroutines in ABAQUS like umeshmotion or umat. Any relevant information would be much appreciated. I am looking for information that are not covered in the ABAQUS manual.


Thanks very much in advace,

Nicholas

Coupling LAMMPS with ABAQUS software

Dear all,

I am looking into coupling the molecular dynamics code LAMMPS with ABAQUS FEA package. Do you have any information about this? Maybe a research group that is currenlty working on this or any relevant publications?

Thanks in advance,

Nicholas

 

Question about curve fitting indentation data with large residual strain

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I am trying to use finite element modeling of indentation experiments
to extract hyperelastic material parameters. I am having a dilemma,
when the tissue has residual strain, the model couldn't achieve the
high nonlinear relationship between displacement vs reaction force as
measured in the experiments.

I have tried several strain energy potentials,

1) W=A/B*{exp[B(I1-3)]-1}
2) W=C10(I1-3)+C01(I2-3) 

3) W=C10(I1-3)+C20(I1-3)^2+C30(I1-3)^3

4) Arruda-Boyce type model

Weld analysis using ansys

Inorder to find out the residual stresses and distortions in butt weld due to thermal loads in steel plates, i have used
shell57 for thermal and shell43 for structural.The material properties used are temperature dependent.

I  carried this out in two steps.

The thermal analysis is carried out first.
A moving heat source is used to generate the temperature distribution on the plate.
Following welding the plate is allowed to cool down to room temperature by naturalconvection due to ambient air.The results from the thermal analysis is ok.

need a project in FEM in metal cutting

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Hello,
I am pursuing masters and I have chosen to do my one year project in FEM IN METAL CUTTING I am looking for some guidance from professionals or researchers working in this field of metal cutting.

also send me any
reference doc

Any help in this regard would be highly appreciated.

Thanks a lot.
regards,
rajesh

Mimics User Community online now!

Leuven, June 9. Materialise releases the Mimimcs User Community; after the Mimics Innovation Awards, the Medical Innovation Conference and the Innovation Courses, yet another initiative to stimulate biomedical R&D, offering an online platform to bring their users together.
It includes among others:
- FAQ
- Tips&Tricks
- Discussion forum
- Tutorials
- Career section
- ...
Visit http://uc.materialise.com/mimics

Join the Mimics UC

Join the Mimics UC

hydraulic cylinder cushion calcualtions

Hi I am krishna Ghatge Mechanical engineer.

I got struck on hydraulic cylinder cushion calcualtions. please help if anyone have any idea or reserch papers.

Thanks

Krishna Ghatge

Glass behaviour-viscoelastic or viscoplastic?

I am a bit confused about glass (silicate glass) material behvoiur. If it is viscoelastic how does it deforms? Does anyone knows any good reference?

 Thanks

FRacture Growth - Abaqus Explicit

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Hi,

        I want to model 3D crack propagation in Abaqus Explicit. For this I am thinking of using the *shear failure option with element deletion. The path of the crackin my models is not known. I have some basic questions in this regard.

 

1. Is *shear failure a good approach to model crack propagation ?

 

2. I am modeling crack growth in geological materials. Usually cracks propagate in the trail of a damage zone. Can this (damage zone) be reproduced in Abaqus Explicit with *shear failure option ? 

Thanks in Advance,

wvmars's picture

Seeking a logarithmic operator for a 4th order tensor

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I don't know whether this question has an answer, but I'd like to see what you all think:

Does anyone know whether or not the following operation is meaningful, whether it is described and defined algorithmically somewhere, and / or how to do it?

ln(Aij) = Bkm ln(Cijkm)

A and B are second order tensors

C is a 4th order tensor

The left hand side involves the natural logarithm of the 2nd order tensor A, which is no problem. 

Is anyone here doing simulation on Carbon Nanotubes

Dear All,

I am new to simulations of carbon nanotubes, especially in their mechanical properties. My supposed tools are ab initio codes or md codes. I am looking for some references. Can someone introduce some classical papers or leading experts in this field.

Thanks.

Problems with FEAP compilations in Visual Studio 2008

I have a problem when a try to compile FEAP with visual studio 2008. The error is the next:

error #6633: The type of the actual arguments differs from the type of the dummy arguments.

I have tryed to compile several times but the error is the same.

I do not know if I have configure properly my visual studio or if it is a problem with mi FEAP.

 

Thank you very much.

Calculation of potential energy in conditions of prescribed displacement and prescribed loading

A question has arised when I read a book about fracture mechanics recently.

This question is about the calculation of potential energy in "fixed-grips" (prescribed displacement) and "dead-load" (prescribed displacement).

Stresses in Elastic Materials in Non-uniform Cooling

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Hi,

 

I am having confusions about the concepts of thermal stresses of an un-constrained elastic body when heated/cooled.

Let's say if I have an elastic body of an arbitrary geometry. If I subject it to a uniform temperature change without any constraints, then there will no thermal stresses at the end of the analysis. I guess I am right till here.

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