User login

You are here

ahmedettaf's blog

ahmedettaf's picture

Modulating elastic band gap structure in layered soft composites using sacrificial interfaces

A wide range of engineered and natural composites exhibit a layered architecture whereby individual building blocks are assembled layer by layer using cohesive interfaces. We present a novel mechanism for evolving acoustic band gap structure in a model system of these composites through patterning the microstructure in a way that triggers non-planar interfacial deformations between the layers as they are stretched.

ahmedettaf's picture

Modulating elastic band gap structure in layered soft composites using sacrificial interfaces

A wide range of engineered and natural composites exhibit a layered architecture whereby individual building blocks are assembled layer by layer using cohesive interfaces. We present a novel mechanism for evolving acoustic band gap structure in a model system of these composites through patterning the microstructure in a way that triggers non-planar interfacial deformations between the layers as they are stretched.

ahmedettaf's picture

[Call for Abstracts] SES minisymposium on Friction, Fracture, and Damage

Dear Colleagues,

We would like to invite you to consider submitting abstracts to the following minisymposium taking place as part of the Soceity of Engineering Sciences meeting to be hosted by the University of Maryland (October 2-5, 2016)

D-9 :Friction, Fracture and damage (http://ses2016.org/symposium-d-9-friction-fracture-and-damage/)

ahmedettaf's picture

[Call for Abstracts] SES minisymposium on Friction, Fracture, and Damage

Dear Colleagues,

We would like to invite you to consider submitting abstracts to the following minisymposium taking place as part of the Soceity of Engineering Sciences meeting to be hosted by the University of Maryland (October 4-7, 2016)

D-9 :Friction, Fracture and damage (http://ses2016.org/symposium-d-9-friction-fracture-and-damage/)

ahmedettaf's picture

Dynamic friction in sheared fault gouge: implications of acoustic vibration on triggering and slow slip†

Friction and deformation in granular fault gouge are among various dynamic interactions associated with seismic phenomena that have important implications for slip mechanisms on earthquake faults. To this end, we propose a mechanistic model of granular fault gouge subject to acoustic vibrations and shear deformation. The grain-scale dynamics is described by the Shear-Transformation-Zone theory of granular flow, which accounts for irreversible plastic deformation in terms of flow defects whose density is governed by an effective temperature.

ahmedettaf's picture

Transfer printing enabled soft composite films for tunable surface topography

Transfer printing, an emerging manufacturing technique for heterogeneous material integration, is combined with the unique mechanics of soft composite films to realize a responsive surface for tunable topography in this work. Soft composite films are fabricated by transfer printing thin silicon ribbons on elastomeric films in a staggered manner. The corrugation formation in soft composite films requires a well-organized spatial distribution of the silicon ribbons which is enabled by transfer printing processes developed here.

ahmedettaf's picture

Journal Club Theme of January 2016: Extreme Mechanics on the Surface of our Planet

Our experience with earthquakes is that they are violent events that take a heavy toll on our societies through life and property losses. However, earthquakes present us with some of the most challenging questions in mechanics. By better understanding the nucleation and propagation dynamics of earthquakes, we may make progress towards minimizing their negative impact. Insights from mechanics may help in the development of better seismic hazard models as well as in the construction of more efficient earthquake early warning systems.

ahmedettaf's picture

2015 Nathan Newmark Distinguished lecture by Professor James Rice

Prof. Jim Rice delivered the 2015/2016 Nathan Newmark Distinguished lecture at University of Illinois Urbana Champaign. This lecture series, organinzed by the Structural Engineering group at UIUC, honors the memory of Prof. Newmark who was an influential figure in computational mathematics, structural dynamics and earthquake engineering. A link to Prof. Rice's lecture can be found here: https://www.youtube.com/watch?v=Ec2y79TVOog

Best,

Ahmed

ahmedettaf's picture

Stick-slip instabilities in sheared granular flow: The role of friction and acoustic vibrations

We propose a theory of shear flow in dense granular materials. A key ingredient of the theory is an effective temperature that determines how the material responds to external driving forces such as shear stresses and vibrations. We show that, within our model, friction between grains produces stick-slip behavior at intermediate shear rates, even if the material is rate-strengthening at larger rates. In addition, externally generated acoustic vibrations alter the stick-slip amplitude, or suppress stick-slip altogether, depending on the pressure and shear rate.

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)

ahmedettaf's picture

PACAMXV: Track 7: Friction, Fracture, and Damage

Dear Colleagues,

We would like to draw your attention to the following minisympoisum taking place as part of the 15th Pan American Conference of Applied Mechnaics (University of Illinois Urbana Champaign May 18021 2015). Deadline for abstract submission is Dec 31st 2014.

Friction, Fracture, and Damage

ahmedettaf's picture

Minisymposim "MS 54: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes" in EMI2015 (Stanford)

Dear Colleagues,

I would like to draw your attention to the following minisymposium taking place as part of the EMI conference in Stanford (June 16-19, 2015)

MS 54: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes

Ahmed Elbanna*, University of Illinois at Urbana Champaign, USA
Glaucio Paulino, University of Illinois at Urbana Champaign, USA

ahmedettaf's picture

Newmark Lecture 2014

Dear Colleagues,

Prof. Ole Sigmund from the Technical University at Denmark: http://www.topopt.dtu.dk/ was the presenter of the 2014-2015 Newmark Distingusihed Lecture which was given in the Civil Engineering Department at the University of Illinois Urbana Champaign. His presentation was titled: Topology Optimization: State of the art and future perspectives. You may find a link to the video lecture here

ahmedettaf's picture

Invitation to submit abstracts for MS54 in EMI 2015 (Stanford)

Dear Colleagues,

I would like to draw your attention to the following minisymposium taking place as part of the EMI conference in Stanford (June 16-19, 2015)

MS 54: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes

Ahmed Elbanna*, University of Illinois at Urbana Champaign, USA
Glaucio Paulino, University of Illinois at Urbana Champaign, USA

ahmedettaf's picture

Call for Abstracts; EMI 2015 Stanford

Dear colleagues,

We cordially invite you to submit your contributions to the following minisymposium: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes taking place as part of the Engineering Mechanics Institute conference (JUne 16-19, 2015) at Stanford.

Best Regards,

Ahmed Elbanna*, University of Illinois at Urbana Champaign, USA
Glaucio Paulino, University of Illinois at Urbana Champaign, USA

MS 54: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes

ahmedettaf's picture

SES Annual Technical Meeting

Dear all,

The following minsymposium organized as part of the upcoming SES meeting [Oct 1- 3 (2014) at Purdue University] may be of interest to you:

http://www.cvent.com/events/ses-annual-technical-meeting/custom-130-756e...

Looking forward to your contributions.

All the best,

Ahmed

ahmedettaf's picture

SES Annual Technical Meeting

 

Dear all, 

The following minisymposium as part of the Society of Engineering Sciences upcoming meeting [Oct 1-3 (2014) : Purdue University] may be of interest to you.

http://www.cvent.com/events/ses-annual-technical-meeting/custom-37-756e8...

 Looking forward to seeing you there.

 

 

ahmedettaf's picture

MM&FGM14: 13th International Conference on Multiscale Modeling and Functionally Graded Materials

Dear Colleagues,

Please consider submitting an abstract to the 13th Internation conference on Multiscale Modeling and Functionally Graded Materials to be held on October 19-22, 2014; in  Taua Resort, SP, Brazi. More information about the conference could be found here:

Normal
0

false
false
false

EN-US
X-NONE
AR-SA

MicrosoftInternetExplorer4

ahmedettaf's picture

17 th National Congress on Theoretical and Applied Mechanics June 15-20 (Michigan State University)

Dear all,

I would like to bring to your attention the following minisymposium that is organized as part of the NCTAM 17 (Michigan State University, June 15-20, 2014)

http://www.usnctam2014.org/minisymposium/friction-adhesion-and-fracture-...

 

Friction, Adhesion and Fracture: From microscale physics to macroscale response

ahmedettaf's picture

A PhD opprotunity in CEE @ UIUC

A PhD opportunity in the field of computational and applied mechanics is available in the department of Civil and Environmental engineering at the University of Illinois at Urbana-Champaign.


Qualifying candidates must have a strong background in mechanics and mathematics. Familiarity with scientific computing in one of the widely used programming languages (e.g. Fortran, C++ or Python)is required.

Subscribe to RSS - ahmedettaf's blog

Recent comments

More comments

Syndicate

Subscribe to Syndicate