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Reg. Penetrations in a Contact Analysis Code

Submitted by shrimad on
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Computational Mechanics Forum
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penetration
FEA
contact analysis
Offset

Hi,

 

I have developed a FORTRAN code to simulate the molding process of glass to make lenses. Hence, it involves a contact analysis between the glass and molds. The contact is modeled using the master and slave node concept and the mold is assumed to be rigid. For the application of this code, we are looking at highly precise dimensions to capture the curve of the mold on the glass after molding.

Averting cracks caused by insertion reaction in lithium-ion batteries

Submitted by Yuhang Hu on
research
fracture
suo group research
lithium-ion battery
cathode material

In a lithium-ion battery, both electrodes are atomic frameworks that host mobile lithium ions. When the battery is being charged or discharged, lithium ions diffuse from one electrode to the other. Such an insertion reaction deforms the electrodes, and may cause the electrodes to crack. This paper uses fracture mechanics to determine the critical conditions to avert cracking. The method is applied to cracks induced by the mismatch between phases in crystalline particles of LiFePO4

Shape of particles in DEM

Submitted by WaiChing Sun on
research
discrete element method

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. 

Nanoindentation of Biological Materials

Submitted by MichelleLOyen on
research
Special issue

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

Submitted by Biswajit Banerjee on
research
research papers

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

Need the references of penetration into soil target

Submitted by huang peng on
research

   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.

   

Watching graphene buring and multilayer edge reconstructions

Submitted by Jianyu Huang on
research
graphene
in-situ TEM
TEM-SPM
edge reconstruction
sublimation
flat fullerene
nanopod
KMC
fractional nanotube
interconnected carbon nanostructures

PNAS 106, 10103 (2009), doi:10.1073/pnas.0905193106, http://www.youtube.com/watch?v=dPJBalMZ824&feature=channel_page,    http://www.nanowerk.com/news/newsid=11108.php

Problem of contact data in ABAQUS 6.8 version

Submitted by jin haeng Lee on
research
ABAQUS
contact

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

Submitted by Nicholas Epiphaniou on
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Computational Mechanics Forum
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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


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