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Model for static and kinetic friction (rate and state)

We recently proposed a model for rate and state friction by studying the collective (statistical) behavior of viscoelastic asperities. Various observed features of friction emerge as collective phenomena, without postulating them directly at the microscale. The paper is available at the link below. 

http://www.sciencedirect.com/science/article/pii/S0022509614002063

 

Thank you.

danial_faghihi's picture

IMECE 2015 Symposium: Modeling and experimental characterization for the behavior of the micro/nanostructured thin films

 We would like to invite you to participate in a symposium on “Modeling and experimental characterization for the behavior of the micro/nanostructured thin films” in ASME 2015 International Mechanical Engineering Congress & Exposition
November 13 – 19, 2015 
Houston, Texas. The deadline for abstract submission is March 2, 2015.

Organizers:

Danial Faghihi, Institute for Computational Engineering & Sciences,UT Austin

Summit on Predictive Modeling of Ductile Failure

Place: AT&T Executive Education and Conference Center, University of Texas at Austin, Austin, TX

Dates: March 2-3, 2015

Adrian S. J. Koh's picture

Position Open at NUS (Singapore): Research Fellow

One Research Fellow (Post-doc) position is open at the National University of Singapore.

If hired, you will work at Soft Materials Lab @ Advanced Robotics Centre (ARC), which I head.

Job Desription: Conduct research on biomechanics of the human motion, and how to effectively harvest energy from these motions using a soft and stretchable generator.  You are expected to perform both theoretical and experimental investigation, produce research papers and perhaps, file patents.

Rashid K. Abu Al-Rub's picture

IMECE 2015 Symposium on “Architectured Multifunctional Materials and Composites”

It is our pleasure to invite you to submit an abstract to the symposium on

Architectured Multifunctional Materials and Composites

as part of Track 12 of IMECE 2015, Houston, Texas, November 13-19, 2015. See attached for more details.

The abstract submission deadline is March 2nd, 2015 (final deadline, no extension).

Organizers:

Rashid K. Abu Al-Rub, Masdar Institute, Abu Dhabi, UAE

Vikas Tomar, Purdu University

Philippe H. Geubelle, University of Illinois at Urbana-Champaign

Yang.Xia's picture

How to determine elastic constants of transversely isotropic material by tension experiment?

Hello. I am working to design an experiment to  determine elastic constants of transversely isotropic material (also plastic-like material). There are five independent coefficients, and with experiment methods described in this paper doi:10.1016/j.ijrmms.2011.12.004, I need to carry out at least 3 tensile experiments. In the experiments, I need to measure not only the tensile strain-stress curve, but also at least one transverse strain to determine the poisson's ratio in the plane of transverse isotropy to a stress acting parallelly to it.

 

Compressor Operator B 30.67 hour

About Us

Dominion is one of the nation's largest producers and transporters of energy, with a portfolio of approximately 27,500 megawatts of electric generation, 11,000 miles of natural gas transmission, gathering and storage pipeline and 63,200 miles of electric transmission and distribution lines. The company operates one of the largest natural gas storage systems in the U.S. with 947 billion cubic feet of capacity, and serves nearly 6 million utility and retail energy customers in 10 states.

D.Rittel's picture

Dynamic necking can avoid notches

Following an earlier post on dynamic necking of tensile bars, we show in the attached paper (to appear in JMPS) that the presence of deep notches in the specimen does not necessarily dictate the location of the neck. Various material parameters are identified and modeled numerically, to assess their respective influence. Strain-rate sensitivity is identified as an important factor. Stated simply, given the fact that local strain rates in a notch are significantly higher than in the rest of the bar, the notch will harden to an extent that it transfers the load elsewhere in the specimen. 

D.Rittel's picture

Surface preparation of dental implants

It is commonly admitted that "rough" surfaces promote osseo-integration of dental implants. Numerous studies emphasize an optimal Ra parameter for this purpose. One very common way to achieve that state is the so-called "grit blasting" process whereby tiny ceramic (alumina) particles are shot on the implant's surface.

Up to here for the basic story.

It has also been noted in other instances that surface blasting may not be entirely beneficial and it should be controlled, in terms of blasting pressure, particle size and shape. 

Avinash Dongare's picture

ASME 2015 IMECE Mini-Symposium on "Genomics and Informatics for Mesoscale Mechanics of Materials"

I am writing on behalf of my co-organizers Alexey Volkov (University of Alabama) and Peter Chung (University of Maryland) to draw your kind attention to a special Symposium titled “Genomics and Informatics for Mesoscale Mechanics of Materials” at the ASME 2015 IMECE Meeting in Houston from November 13-19, 2015.  Please consider submitting an abstract to this symposium.  The scope of the symposium is aligned with interest in MGI and mesosca

Hamed Hatami's picture

Mini-symposium on Mechanics of Fibrous Materials at USNCCM-13, San Diego July 2015

I would like to bring to your attention the mini-symposium entitled "Mechanical Properties of Randomly Cross-Linked Semiflexible Fibrous Materials”,  http://13.usnccm.org/MS1011

Rashid K. Abu Al-Rub's picture

IMECE 2015 Symposium on “Mechanics of Hydraulic Fracturing (fracking)”

It is our pleasure to invite you to submit an abstract to the symposium on

Mechanics of Hydraulic Fracturing (fracking)

as part of Track 12 of IMECE 2015, Houston, Texas, November 13-19, 2015. See attached for more details.

The abstract submission deadline is March 2nd, 2015 (final deadline, no extension).

Organizers:

Rashid K. Abu Al-Rub, Masdar Institute, Abu Dhabi, UAE

K. Ravi-Chandar, University of Texas-Austin

Chad M. Landis, University of Texas-Austin

Ali Ghahremaninizhad, University of Miami

IMECE 2015: Student Travel Awards and Best Paper Contest

Dear IMECE Attendees:

The Applied Mechanics Executive Committee (AMD-EC) is pleased to announce the 2015 IMECE student travel award and best paper competition.

On the modeling of asymmetric yield functions

In the context of metal plasticity, the yield function of a metal polycrystal is its most complex macro-characteristic. Letting aside the questions of kinematic or distortional hardening, the basic problem is geometric in nature: to design a family of convex surfaces capable of reproducing a wide range of experimental, or theoretically predicted data. While many satisfactory solutions have been proposed for the modeling of symmetric (with respect to the origin of the stress space) yield functions, the more general case of asymmetric functions has not witnessed comparable progress.

Siva P V Nadimpalli's picture

IMECE 2015 Symposium on "Mechanics of Deformation and Failure of Energy Materials"

Dear Colleagues,

We invite you to submit an abstract to the symposium titled “Mechanics of Deformation and Failure of Energy Materials” at the IMECE 2015Houston, Texas, November 13-19, 2015. 

Michael Ortiz will receive the 2015 Timoshenko Medal

Michael Ortiz will receive the 2015 Timoshenko Medal.  He will give the speech of acceptance at the Annual Applied Mechanics Banquet, on Tuesday, 17 November 2015, in Houston, at the ASME International Mechanical Engineering Congress & Exposition.  

Come to the Congress to congratulate Professor Michael Ortiz in person.  

PhD Position

PhD Position in the Department of Mechanical Engineering at Rowan University

Fan Yang's picture

Is energy conservation satisfied in the current deformation application schemes in molecular dynamic simulations?

In our recent paper, we examined the energy conservation for the current schemes of applying active deformation in molecular dynamics (MD) simulations. Specifically, two methods are examined. One is scaling the dimension of the simulation box and the atom positions via an affine transformation, suitable for the periodic system. The other is moving the rigid walls that interact with the atoms in the system, suitable for the non-periodic system.

ahmedettaf's picture

Call for Abstracts [USNCC13]: Multiscale Modeling and Simulation of Fracture and Damage in Quasi-Brittle Solids

Dear all,

 

We would like to draw your attention to the following minsiymposium on multiscale modeling of fracture in quasibrittle solids that will be taking place as part of USNCCM 13 to be held at San Diego [July 26-30]. For those who are interested in submitting an abstract, the deadline is Feb 15th. Please feel free to pass this announcemnts to your colleagues or students whom you think may be interested. We are looking forward to seeing you there either in the audience or giving a talk!

Best Wishes,

 

Ahmed Elbanna (UIUC) and Robert Haber (UIUC)

ahmedettaf's picture

Call for abstracts on Multiscale Modeling of Granular Materials, USNCCM 13 San Diego [July 26-30, 2015]

Dear all,

We would like to draw your attention to the following minsiymposium on multiscale modeling of granular materials that will be taking place as part of USNCCM 13 to be held at San Diego [July 26-30]. For those who are interested in submitting an abstract, the deadline is Feb 15th. Please feel free to pass this announcemnts to your colleagues or students whom you think may be interested. We are looking forward to seeing you there either in the audience or giving a talk!Best Wishes,

Ahmed Elbanna (UIUC) and Waiching Sun (Columbia University)

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