User login

You are here

research

Yonggang Huang's picture

new paper on fracking in JAM by Prof. Bazant

Fracking has been an important research topic in recent years.  JAM just published a paper "Why Fracking Works" by Professor Zdenek Bazant and his co-authors (JAM, volume 81, paper 101010, 2014).  This paper is of great interest, not only to mechanics, but also to engineers interested in fracking.

The paper is attached.

JMPS paper-Micro-buckling in the nanocomposite structure of biological materials

Choose a channel featured in the header of iMechanica: 

Nanocomposite structure, consisting of hard mineral and soft protein, is the elementary building block of biological materials, where the mineral crystals are arranged in a staggered manner in protein matrix. This special alignment of mineral is supposed to be crucial to the structural stability of the biological materials under compressive load, but the underlying mechanism is not yet clear.

a JMPS paper about mechanosensing in cell-substrate interaction

Choose a channel featured in the header of iMechanica: 

JMPS paper: "Some basic questions o mechanosensing in cell–substrate interaction"

In this paper, a mechanical model of cell-substrate interaction is constructed and discovers the mechanisms of cell sensing  compliance, thinckness and distance. If you are interested, pls see details in the paper.

Thermal analysis of slab

Choose a channel featured in the header of iMechanica: 

Dear All,

karelmatous's picture

Extreme Computing

There have been several discussions on "Extreme Mechanics" in recent weeks and I would like to extend this topic to "Extreme Computing". As we develop materials that are more complex, hierarchical and are spanning multiple spatial scales, we will need computational tools that can describe them well. Fluid dynamics community has long time ago embraced large-scale computing of conservation laws of mass, momentum and energy. In mechanics of materials, large-scale computing is still in infancy.

Oleksandr Glushko's picture

Recovery of electrical resistance in copper films on PET subjected to a tensile strain

For flexible electronics applications it is important to understand the behavior of electrical resistance of metal films on polymer substrates under applied tensile strain. Although the growth of resistance during tensile loading was investigated in a number of research papers, the recovery of resistance during unloading remains virtually unexplored. In this paper, substantial recovery (decrease) of electrical resistance during and after unloading is demonstrated for copper films on polyethylene terephthalate (PET) substrates subjected to a tensile strain with different peak values.

Zhigang Suo's picture

Fundamental discoveries in mechanics in recent decade or so

A previous post, Getting Ready for Extreme Mechanics Letters, contained the following paragraph:

“We seek papers from researchers in all disciplines. Mechanics appeals to talents of all kinds. Good mechanics has long been created by people from many fields, by Galileo, Newton, Maxwell and Faraday, as well as by Watt, Darwin, Wright brothers and Whitesides. People make discoveries in mechanics often when doing something else (e.g., in seeking evidence for the existence of God, in building cathedrals, in flying airplanes, in laying transatlantic telegraph cables, in fabricating microprocessors, in watching cells move, in fracking for gas, in inventing optical tweezers, in creating soft lithography, in developing wearable or implantable electronics). Mechanics discovered in one field invariably finds applications in other fields.”

Here I would like to give several examples of papers published in recent decade or so. I will link each paper to its citations on Google Scholar, so that you can have an overview of the influence of the paper on other researchers.

Constitutive modeling of hyperelastic solids reinforced by spheroidal particles under large deformations

This paper presents a homogenization-based constitutive model for the mechanical behavior of particle-reinforced elastomers with random microstructures subjected to finite deformations. The model is based on a recently developed homogenization method (Avazmohammadi and Ponte Castaneda 2013; J. Elasticity 112, 1828–1850) for two-phase, hyperelastic composites, and is able to directly account for the shape, orientation, and concentration of the particles.

Soud Choudhury's picture

Abaqus is not reporting any CEEQ in coupled temp-displacement step

Hi all,

I am modeling a simple coupled temp-displecment analysis with the following step information:

** MATERIALS

** 

*Material, name=Material-1

*Conductivity

 1e-06,

*Creep, law=HYPERB

44000., 0.005,   4.2, 45000., 8.314

*Elastic

60000., 0.34

*Expansion, zero=25.

 1.4e-05,

*Plastic

20.,  0.

60., 0.1

** 

** PHYSICAL CONSTANTS

** 

*Physical Constants, absolute zero=-273., universal gas=8.314

** STEP: Step-1

** 

XFEM ABAQUS Help

Choose a channel featured in the header of iMechanica: 

I am trying to run an XFEM analysis which consists of assembly of more than 20 instances. I am getting the error, ABAQUS CANNOT ALLOW MORE THAN 20  ENRICHMENT REGIONS IN ONE MODEL. Is there anything I could do? I need to define XFEM cracks (Special>Cracks>Crack Manager> Create > XFEM Crack )for all the 30 parts assembly.

 

Please assist.

Davide Bigoni's picture

Elastica arm scale

Can configurational forces be exploited to design a new type of scale?

See the explanation and an example of use at http://www.ing.unitn.it/~bigoni/elasticscale.html

If you're having trouble playing videos on YouTube, click here to watch it.

 

stress at a point other than integration points in VUMAT/UMAT

Hi all,

The question is how can the stress at a point other than integration points be evaluated in VUMAT/UMAT. Interpolation may be a general method. However, to me, it seems not so easy to be implemented, for I have no idea of the way to retrieve the necessary information of all integration points (their indexes, positions etc.) belongint to a identical FE. Any help would be appreciated.

Fast publishing journals

I am doing reserach in the field of multi-scale modelling of mechanical behavior of polymers.

I was wondering if nayone could introduce me fast publishing (up to three months submission to publication period) in the following areas:

New shear lock free finite elements with arbitrary higher order derivative

A set of highly efficient and shear lock free finite elements based on Timoshenko  beam and Reissner-Mindlin plate theories has been developed for the analysis of thin and thick structures. These elements have arbitrary higher order derivatives and do not require any spcial integration scheme. All are isoparametric elements.

P.Subramanian

USNCTAM Perspectives on Mechanics in Medicine

Dear Colleagues. I would like to share with you a perspective article on mechanics in medicine by a commission from US National Committee of Theoretical and AppliedMechanics ( online):   

http://sites.nationalacademies.org/pga/biso/IUTAM/

Pradeep Sharma's picture

Electrets in soft materials...

This work---whose abstract appears below, has been accepted for publication in Phy. Rev. E: http://journals.aps.org/pre/abstract/10.1103/PhysRevE.90.012603

Transverse shear stresses in Reissner Mindlin theory

How is it possible to obtain the transverse shear stresses correctly, not constant, by Reissner Mindlin theory?

Equilibrium equation would be the first solution, but, once the second derivatives of bilinear shape functions are zero, no results is appeared.

 

Thanks in advance for any help!

Virtual Special Issue: 'Outstanding research contributions in the area of nonlinear continuum and computational mechanics'

The 2014 Nathan M. Newmark Medal was awarded to Professor Herbert A. Mang at the annual ASCE Structures Conference, which took place in Boston, April 3–5, 2014. Professor Mang was awarded the Newmark Medal for his outstanding research contributions in the area of nonlinear continuum and computational mechanics that clarified the cause of collapse of important concrete structures and quantified the influence of the initial post buckling behavior of metallic structures.  

 

Ask for comments on my results from unit cell model of MMCs

Choose a channel featured in the header of iMechanica: 

Dear friends,

Could anyone be kind to share some comments on my interesting results? It is my first time to post a topic, hope to communicate more with the members here.

Pages

Subscribe to RSS - research

Recent comments

More comments

Syndicate

Subscribe to Syndicate