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Strengthening alginate/polyacrylamide hydrogels using various multivalent cations

Submitted by _canhuiyang on
research
suo group research
alginate/polyacrylamide hydrogel
multivalent cations
We successfully synthesized a family of alginate/polyacrylamide hydrogels using various multivalent cations. These hydrogels exhibit exceptional mechanical properties. In particular, we found that the hydrogels cross-linked by trivalent cations are much stronger than those cross-linked by divalent cations. We demonstrate stretchability and toughness of the hydrogels by inflating a hydrogel sheet

Running MD simulations with LAMMPS

Submitted by Nuwan Dewapriya on
research
molecular dynamics
LAMMPS
graphene nano-ribbon
nanoscale tension test
LAMMPS input files

In appendix A of my PhD thesis, I share a MATLAB code to get coordinates of carbon atoms in a graphene sheet. The code also generates the data file required for LAMMPS. In addition, I included a sample input and the corresponding output files from LAMMPS. I hope this will be useful for those who would like to learn MD simulations.

Visual Molecular Dynamics (VMD) package can also be used to obtain coordinates of graphene.

Determination of Density of Laminated Composite

Submitted by Amin Khajeh on
research
Determining Density of laminated composite.

Dear Engineers,

 I would like to determine the density of laminated composite which consists of one lamina E-Glass/Epoxy and another one is thin layer of steel plate due to determining Young's Modulus through non-diestructive technique-Impulse excitation.

Any suggestions would be welcome.

 

var vglnk = { api_url: '//api.viglink.com/api', key: 'a187ca0f52aa99eb8b5c172d5d93c05b' };

var vglnk = { api_url: '//api.viglink.com/api', key: 'a187ca0f52aa99eb8b5c172d5d93c05b' };

Abaqus Subroutine and python subscripting

Submitted by rajnish0007 on
research

Dear All, 

I was wondering if anyone used abaqus user subroutines to couple the micro and macro models? If any one has used it and is also willing to share the knowledge?

I am looking for some guidance on how to run another *inp and get it's out put in the subroutine. any example on this is greatly appreciated. 

Recent paper on the flattening deformation of metal columns

Submitted by Seyed Ahmad Elahi on
research
This paper presents a theoretical and
experimental study on lateral compression of square and rectangular metal
columns. Some theoretical relations are derived to predict the absorbed energy,
the specific absorbed energy and the instantaneous lateral load during the
lateral compression. Analytical relations are obtained in two stages: elastic
and plastic parts. In the plastic zone, the total absorbed energy by the column
is calculated, based on the energy method. Then, an analytical equation is
derived to predict the instantaneous lateral load. In the elastic part, the
instantaneous load is obtained by linear behavior assumption. To verify the

Math Kernel Library MKL

Submitted by Echeban on
Forums
Computational Mechanics Forum
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research
Free Tags
buckling
eigenvalue
eigenmodes
bifurcation buckling
I want to use Intel Math Kernel Library (MKL) to calculate the bifurcation loads and modes in my custom FE program. MKL has many algorithms and I want to use the most efficient one.

Basically, I need to find a few eigenvalues lambda_i and eigenvectors u_i for the problem

KG * u = lambda * KS * u

where KG is the stiffness matrix and KS is the geometric stiffness matrix, also called stress-displacement matrix.

Is KG supposed to be positive definite?

Virtual Special Issue: CFD simulation of pedestrian-level wind conditions around buildings: past achievements and prospects

Submitted by Laure Ballu on
research
thermal
construction
WIND engineering
CFD simulation
industrial aerodynamics
pedestrian
windbreaks

This Virtual Specail Issue deals with papers on CFD simulation of pedestrian-level wind conditions around buildings, published in the Journal of Wind Engineering and Industrial Aerodynamics (JWEIA).

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