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Spinning Modeling

Submitted by hessamvalidi on

Hi everybody,

I modeled a sheet metal forming process in which entire blank is partitioned into two regions (Central and exterior regions). Forming tool is considered as a 3D-Analytical rigid body (Revolved Shell) and partitioned into two regions too. According to this process, the head of punch should be tied to the central region of the blank and punch's walls should contact with exterior region.

In interaction module, I can’t select defined regions on forming tool separately as the surfaces and I don’t know why the whole surface of the punch is selected?

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

Free Finite Element Programs in Fortran 95

Submitted by Jinsong Huang on
software

Programs from Programming the Finite Element Method by Ian M. Smith and D. V. Griffiths are downloadable from: www.mines.edu/~vgriffit/4th_ed/Software This title demonstrates how to develop computer programmes which solve specific engineering problems using the finite element method. It enables students, scientists and engineers to assemble their own computer programmes to produce numerical results to solve these problems.

New papers on thermodynamics and mechanics of surfaces

Submitted by Robert C. Cammarata on
thermodynamics
surface stress
surface energy
nanoscale thermodynamics

Please allow me to note that I have recently published in Philosophical Magazine a paper that presents a general approach to Gibbsian surface thermodynamics that includes a treatment of solid surfaces.  It can be accessed through the following link: 

http://www.informaworld.com/smpp/content~db=all~content=a792987191

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. 

Possibility of modifying the tangential stifness matrix using external subroutines in abaqus

Submitted by unsrohith on

Hi,

I am working on implementation of non local damage mechanics model in abaqus using  external subroutines, But in that case I have to modify the stifness matrix by adding the newly formed nonlocal stifness,  Out of the available external subroutine options in abaqus documentation if any one gives the option to modify the tangential stifness matrix Please help me in the same.

Thanks and Regards,

Rohith

need help in Ansys static analysis

Submitted by dileepade on
opinion
opinion and advice on ansys elements and commands

sir ,i ahve some problems in use ansys element CERIG,MPC 184 and RB3 elements....what is difference in transfering loads to slave nodes using MPC184 elements and command CERIG and RBE3 ..

 

and also why mass21 elements are required if u defining coonection usimg CERIg and RBE3 command..

 

plz...advice and clarify my doubts to understand better..

 

thanks and regards..

 

-dileep 

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)

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