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Henry Tan's picture

Surface roughness evolution

Surface roughness evolution in frequency domain.
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Aerodynamics/CFD research

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Hi,

i am a student of mechanical engg from india . Am a aerodynamics/computational enthusiast .

can someone tell me what are the current research topics in this field ..

MichelleLOyen's picture

Adhesion in viscoelastic contacts

Yesterday I had the distinct pleasure of seeing a mechanics seminar delivered "tag-team" by Ken Johnson and Jim Greenwood. (I know several people have thought I was a bit mad for jumping "across the pond" but there are really some amazing benefits of being part of the Cambridge Engineering faculty!)

Xuejun Fan's picture

Adhesion study for polymer/polymer interface or polymer/metal interface in microscopic level

Is there any study on hierarchical structures for polymer/polymer interface or polymer/metal interface? and link the polymer molecular structure with fracture or adhesion study? What is the role of mechanical bonding compared to physical and chemical bonding?

Micropolar material constants

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Can someone help me to give the numerical values for micropolar elastic solids and micropolar fluids so that i can study the behaviour of such materials numericaly?  Also suggest me some references and books regarding Micropolar Elasticity. 

Micropolar material constants

Can someone help me to give the numerical values for micropolar elastic solids and micropolar fluids so that i can study the behaviour of such materials numericaly?  Also

Microcantilever operated in liquid environment for in-vitro biomolecular detection

We have recently reported the piezoelectric thick film microcantilever, which enables the in-situ real-time detection of the protein related to disease (e.g. C reactive protein) in liquid environment. This work was published at APL (click here).

"In-situ real-time monitoring of biomolecular interactions based on resonating microcantilevers immersed in a viscous fluid"

Henry Tan's picture

POLYMER MATRIX COMPOSITES REINFORCED BY CARBON NANOTUBES

CONTINUUM MODELING OF INTERFACES IN POLYMER MATRIX COMPOSITES REINFORCED BY CARBON NANOTUBES

L. Y. JIANG, H. TAN, J. WU, Y. HUANG, K. -C. HWANG
Review Article, 2007, accepted by NANO

The interface behavior may significantly influence the mechanical properties of carbon nanotube (CNT)-reinforced composites due to the large interface area per unit volume at the composite. The modeling of CNT/polymer interfaces has been a challenge in the continuum modeling of CNT reinforced composites.

Henry Tan's picture

carbon nanotube-reinforced composite materials

The effect of van der Waals-based interface cohesive law on carbonnanotube-reinforced composite materials

H. Tan, L. Y. Jiang, Y. Huang, B. Liu, and K. C. Hwang
Composite Science and Technology, 2007, accepted.

Amit Acharya's picture

papers related to reply: apparent randomness continues

Two papers are attached related to randomness discussion.

Xuanhe Zhao's picture

Electromechanical hysteresis and coexistent states in dielectric elastomers

Active polymers are being developed to mimic a salient feature of life: movement in response to stimuli. Large deformation can lead to intriguing phenomena; for example, recent experiments have shown that a voltage can deform a layer of a dielectric elastomer into two coexistent states, one being flat and the other wrinkled. This observation, as well as the needs to analyze large deformation under diverse stimuli, has led us to reexamine the theory of electromechanics.

Simulating explosions

Recently Henry talked about software that could be used to simulate explosions and introduced CartaBlanca. Luming asked whether anyone had used the software, how good it was, and whether one needed Java to implement models into CartaBlanca.

MichelleLOyen's picture

New Micromechanics Book

This message about a new book came over the PoroNet (poroelasticity network) mailing list:

Dear Colleagues:

      I would like to inform you that my book "Micromechanics of Heterogeneous Materials” (containing around 700 pages, 140 figures, 3000 formulae, and 1200 references) should be published by Springer on 07.06.07. [Details are on the web http://www.springer.com/west/home/engineering?SGWID=4-175-22-173670290-d...|toc ] .

      In the framework of a unique scheme of the proposed multiparticle effective field method, we have undertaken in this book an attempt to analyze the wide class of statical and dynamical, local and nonlocal, linear and nonlinear multiscale problems of composite materials with deterministic (periodic and nonperiodic), random (statistically homogeneous and inhomogeneous, so-called graded) and mixed (periodic structures with random imperfections) structures in bounded and unbounded domains, containing coated or uncoated inclusions of any shape and orientation and subjected to coupled or uncoupled, homogeneous or inhomogeneous external fields of different physical natures.

        Any the remarks and comments regarding the book will be fully appreciated.

Fang Wang's picture

BRAIN TEMPERATURE AND INTRACRANIAL PRESSURE – A QUANTITATIVE BIOLOGICAL-THERMAL-MECHANICAL PERSPECTIVE

The present paper studies the effect of intracranial temperature (ICT) change on intracranial pressure (ICP). Thermal and mechanical effects were analyzed using a 3D finite element model of the human head.

Ashfaq Adnan's picture

Why larger time step is not allowed in Molecular Dynamics Simulation?

Hi, 

I am trying to understand why MD simulation crashes if larger time step (~100 fs) is applied to integrate the equation of motion. I know that there are two major things play role in solving F = ma and obtaining equilibrium solution. One is the accuracy, and the other is numerical stability of the integration algorithm.

Fang Wang's picture

Effects of Head Size and Morphology on Dynamic Responses to Impact Loading

Head responses subjected to impact loading are studied using the finite element method. The dynamic responses of the stress, strain, strain energy density and the intracranial pressure govern the intracranial tissues and skull material failures, and therefore, the traumatic injuries.

Henry Tan's picture

Sandwich structures

This blog is on the sandwich structures.

JDI's picture

Science, 6, April, 2007 Direct-Current Nanogenerator Driven by Ultrasonic Waves

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What can we do in this discovery and creation?

By Xudong Wang, Jinhui Song, Jin Liu, Zhong Lin Wang*

Seungtae Choi's picture

Scale bridging mechanics: Nanoscale planar field projection of atomic decohesion and slip in crystalline solids

I would like to introduce my recent paper on field projection method with Prof. K.-S. Kim at Brown University. When atomistic simulations or atomic resolution experiments are carried out to analyze deformation energetics of atomic lattices near a crack tip, the results of the atomic positions and the total energy of the system have not been systematically converted to field quantities such as stresses or tractions near the crack tip. In this study, we introduce a mathematically consistent way of defining and measuring the cohesive tractions, separations and surface stresses in an atomic decohesion process zone using the atomic displacement data at some distance away from the crack tip. The method is called “nano-scale planar field projection method.” This is a generalization of the method developed for isotropic homogeneous solids by Hong and Kim (2003). The formulation introduced here is applicable to interface cracks between anisotropic solids as well as to cracks in homogeneous solids whether they are anisotropic or isotropic. The field projection method is then applied to a crack tip field in gold, simulated atomistically. The atomistic simulation is made with an embedded atom method (EAM) potential for a crystal decohesion along [112] direction in a (111) plane. Then, the details of energy partition in various modes of nano-scale separation processes are analyzed with the field projection method.

How to include the surface effect aournd a nano-sized crack

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Dear Mechanicians,

I am reading some papers on the surface effects of nano-sized elements(bars,beams, plates, films) or defects(inhomogeneities, inclusions, cavities) these days. Some researchers have studied the surface effects on the stress state around a circular hole or an elliptic hole. I wonder if there is any research work on the surface effect around a nano-sized crack. Thank you!

Fang Wang's picture

BIOMECHANICAL STUDY OF GOLF BALL IMPACT ON CHILD’S HEAD USING THE FINITE ELEMENT METHOD

Head traumatic injury due to the impact of a flying golf ball is one of the severest injuries sustained on a golf course. This paper presents numerical simulation results based on the finite element (FE) method to investigate head injuries in children due to impacts by flying golf balls.

Ying Li's picture

How to characterize the interface?

Recently, I am interested in the interface between two different masses. But, I don’t know how to characterize the interface between them, especially the adhesive strength and the mechanics model.

huang peng's picture

Impact and explosion mechanics in China

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Impact and explosion mechanics in China

Impact and explosion mechanics is a muti-discipline subject , which concern mechanics, physics, and chemistry. As you know, explosive wave propagation and penetration problems are researched in impact and explosion mechanics.

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