User login

You are here

research

mohsenzaeem's picture

Understanding Homogeneous Nucleation in Solidification of Aluminum by Molecular Dynamics Simulations (OPEN ACCESS)

Homogeneous nucleation from aluminum (Al) melt was investigated by million-atom molecular dynamics (MD) simulations utilizing the second nearest neighbor modified embedded atom method (MEAM) potentials. The natural spontaneous homogenous nucleation from the Al melt was produced without any influence of pressure, free surface effects and impurities. Initially isothermal crystal nucleation from undercooled melt was studied at different constant temperatures, and later superheated Al melt was quenched with different cooling rates.

Amir Abdollahi's picture

Flexoelectricity in Bones: A nanophenomenon that triggers the bone-repair process

Bones generate electricity under pressure, and this electromechanical behavior is thought to be essential for bone's self-repair and remodeling properties. The origin of this response is attributed to the piezoelectricity of collagen, which is the main structural protein of bones. In theory, however, any material can also generate voltages in response to strain gradients, thanks to the property known as flexoelectricity.

ntuecd's picture

Welding simulation

The aim of this tutorial is to develop a step-by-step instructions for simulation of a welding process with the FEA-program LS-PrePost. The tutorial contain a simulation of a single-pass gas metal arc welding, but we can use the same method to simulate multi-pass welding.

Yizhe_Tang's picture

Inertia of Dislocation Motion and Negative Mechanical Response in Crystals

Dear Colleagues,

Please see attached a recent article published in Scientific Reports on the fundamental nature of dislocation motion in crystals. Leave your comments or whatever you think of it.

Link: https://www.nature.com/articles/s41598-017-18254-5

 

Best,

User defined contact output (at contact pairs)

Choose a channel featured in the header of iMechanica: 

Hi all,

Jingjie Yeo's picture

High-Strength, Durable All-Silk Fibroin Hydrogels with Versatile Processability toward Multifunctional Applications

http://onlinelibrary.wiley.com/doi/10.1002/adfm.201704757/full Hydrogels are the focus of extensive research due to their potential use in fields including biomedical, pharmaceutical, biosensors, and cosmetics. However, the general weak mechanical properties of hydrogels limit their utility. Here, pristine silk fibroin (SF) hydrogels with excellent mechanical properties are generated via a binary-solvent-induced conformation transition (BSICT) strategy.

Sundaraelangovan selvam's picture

Validation of Numerical (INCS) method for Elastic wave case

Choose a channel featured in the header of iMechanica: 

Dear mechanician,

Mike Ciavarella's picture

Nobel laureate Randy Schekman: How journals like Nature, Cell and Science are damaging science

An article on the Guardian here.  Critics will say Shelkman has founded his own open access journal, here, probably competing with Nature, Cell and Science, which explains a lot.

 

SHEN Zhiyuan's picture

SHEN Zhiyuan-Regarding to use the effective Kirshhoff plate property to model a microbeam

I am studying the vibrational behaviour of a microbeam made of a polymer (Fig. 1). I came across your paper "Equivalent models of corrugated panels" and find the effective material modelling reported in that paper very helpful for solving my modelling problem. I got some problems that I want to seek for your advices.

Frequency effect on fatigue life of metal-composite

Choose a channel featured in the header of iMechanica: 

Hi 

I have few questions:

1- why most the experimental fatigue studies on metal or metal-composites in the literature were adopted a frequency less than 35Hz (the majority of these test have conducted using 20Hz).

I ran into some articles mentioned that the frequency (0-100Hz) has a marginal effect on the fatigue life of metal. is that the only answer

 

Ajeet Kumar's picture

A thermo-elasto-plastic theory for special Cosserat rods

A general framework is presented to model coupled thermo-elasto-plastic deformations in the theory of special Cosserat rods. The use of the one-dimensional form of the energy balance in conjunction with the one-dimensional entropy balance allows us to obtain an additional equation for the evolution of a temperature-like one-dimensional field variable together with constitutive relations for this theory. Reduction to the case of thermoelasticity leads us to the well known nonlinear theory of thermoelasticity for special Cosserat rods.

Computational Mechanics Luxembourg 2018. Lab report.

Please find our activity report here 

http://hdl.handle.net/10993/33806

http://orbilu.uni.lu/bitstream/10993/33806/1/2018labReport.pdf

Highlights

- Highly Cited Clarivate Analytics  

- Free Software Download

- 15 PhD positions open in computational biomechanics

- upcoming ECCOMAS sister association in Luxembourg 

- Short courses and new Master Programme

- Open Access free paper downloads

Ajeet Kumar's picture

Effect of surface elasticity on extensional and torsional stiffnesses of isotropic circular nanorods

We present a continuum formulation to obtain simple expressions demonstrating the effects of surface residual stress and surface elastic constants on extensional and torsional stiffnesses of isotropic circular nanorods. Unlike the case of rectangular nanorods, we show that the stiffnesses of circular nanorods also depend on surface residual stress components. This is attributed to non-zero surface curvature inherent in circular nanorods.

Cai Shengqiang's picture

Journal club for January 2018: Recent advances in liquid crystal elastomer

Recent advances in liquid crystal elastomer

Zhijian Wang, Shengqiang Cai

Department of Mechanical and Aerospace Engineering

Materials Science and Engineering Program

UCSD

mohsenzaeem's picture

Metastable phase transformation and deformation twinning induced hardening-stiffening mechanism in compression of silicon nanoparticles

The compressive mechanical responses of silicon nanoparticles with respect to crystallographic orientations are investigated by atomistic simulations. Superelastic and abrupt hardening-stiffening behaviors are revealed in [110]-, [111]- and [112]-oriented nanoparticles. The obtained hardness values of these particles are in good agreement with the experimental results. In particular, [111]-oriented particle is extremely hard since its hardness (∼33.7 GPa) is almost three times greater than that of the bulk silicon (∼12 GPa).

Mike Ciavarella's picture

An inspiring seminar by Prof. Huajian Gao -- Mechanics as an Enabling tool in bioinspired materials and biological interactions of nanomaterials

Professor Huajian Gao of Brown University speaks at MIT Distinguished Seminar Series (March 2016).

It is a unique opportunity to enjoy the many important recent achievements of Huajian's group.

Mechanics as an Enabling tool in bioinspired materials and biological interactions of nanomaterials

Here.

Not to be missed!

SHEN Zhiyuan's picture

Regarding to the effective elastic property of a double-layered perforation

Choose a channel featured in the header of iMechanica: 

Dear Friends, Attached please find a doc describing the problem. Any feed back is welcome. Thanks!

Antonio Papangelo's picture

Multiple spatially localized dynamical states in friction-excited oscillator chains

  • Journal of Sound and Vibration

 

A. Papangelo (a,*), N. Hoffmann (a,b), A. Grolet (c), M. Stender (a), M. Ciavarella (d)

a) Hamburg University of Technology, Department of Mechanical Engineering, Am Schwarzenberg-Campus 1, 21073, Hamburg, Germany

b) Imperial College London, Exhibition Road, London, SW7 2AZ, UK

29th Robert J. Melosh Competition - Call for Applicants & Papers

Twenty-ninth edition of the Annual Robert J. Melosh Competition at Duke University  Duke University will host on April 27, 2018 the XXIX Annual Robert J. Melosh Competition for best papers by graduate (or recently graduated) students. The deadline for extended abstract submission is January 22, 2018.

Mike Ciavarella's picture

Fontanela instability in non-linear oscillators with cyclic symmetry

I wanted to bring attention to the very important Fontanela et al recent results in vibrations of cyclic structures like in turbine engines.

ahmedettaf's picture

Can you "chop" a mechanical wave?

In this paper we highlight several interesting phenomena that may emerge from coupling simple elastic systems like 1d bars. While in compostes we usually focus on wave propagation normal to the stratification direction (composite layers are coupled in series), here we show that extreme attenuation at multiple frequencies may emerge in linear systems that are coupled transversaly. We also introduce a simple device that act as a chopper for mechanical signals.

http://www.nature.com/articles/s41598-017-16364-8

Pages

Subscribe to RSS - research

Recent comments

More comments

Syndicate

Subscribe to Syndicate