Piezoelectricity above the Curie temperature? Combining flexoelectricity and functional grading to enable high-temperature electSubmitted by rmbarki on Wed, 2014-03-26 14:42.
Most technologically relevant ferroelectrics typically lose piezoelectricity
I was curious whether there are any
experimental information and / or results regarding the out of plane (anti-plane)
deformation of (very) thin films. For example an elastic thin film subjected to anti-plane loading on its surface. Any other suggestions regarding possible applications of anti-plane loading conditions in thin films would be appreciated.
Thanks a lot,
Improved barrier properties in polyolefins (Job Code: ME-PDSK032013)
An apparatus for performing microtensile tests at elevated temperatures inside a scanning electron microscopeSubmitted by Gi-Dong Sim on Mon, 2013-09-30 20:54.
One Ph.D position starting from Spring, 2014 is available in the Mechanical Engineering Department at Temple University, Philadelphia, PA, US.
The research program will focus on mechanics of multi-functional materials and structures, thin film, mechanical self-assembly, and their novel applications in healthcare, energy absorption, and energy harvesting, etc. The research will involve a combination of experiments, modeling, and simulation methods (FEM and MD etc). Candidates with experimental or modeling background and interests in solid mechanics, mechanical engineering, materials science, and bio-engineering are highly encouraged to apply.
From a mechanical instability perspective, a double-eyelid is a double-folded thin film structure on a curved substrate, caused by compression as the film “slides” on the substrate. The underlying mechanics issues, in particular the requirements for forming a double-folded structure, are studied using a modeling/simulation framework. A minimalist model is employed to explore the wrinkle-to-fold transition. Refined and enriched models are further developed based on anatomical structures, which demonstrate three critical factors for the formation of double-layer folding of the eyelid. First, a crease line in the eyelid is essential where the local bending rigidity is relatively weak. Second, the skin above the crease line should be thin and wide enough. Third, the skin below the crease line should be possessed with relatively large effective stiffness so it can be lifted as a whole when eyes open. When the eye is opened beyond about 40% of its initial wrinkle wavelength, the double-folded structure emerges. Various types of eyelid morphologies are discussed based on the mechanistic model. The study provides useful insights for surgery, cosmetics, morphogenesis, as well as microfabrication.
Simulation of the double (up) and single (down) eyelid.
A thin film undergoes wrinkle-to-fold transition on a rigid substrate with increasing compression.
New Applications of Small-Scale Mechanical Testing: Half Day Tutorial at TMS 2013 Annual Meeting in San AntonioSubmitted by Dan Gianola on Sat, 2013-01-26 13:01.
Half-day Tutorial at 2013 TMS in San Antonio
New Applications of Small-Scale Mechanical Testing
The tutorial will start at 1pm Sunday, March 3rd and will discuss topics including:
• Nanoindentation Techniques
• Fatigue of thin films
• Testing at Elevated Temperatures
• Chemical and Environmental Effects
On behalf of the organizing committee, I cordially invite your participation in Symposium on Wrinkled and Crumpled Membranes, as part of the 13th Pan-American Congress of Applied Mechanics (PACAM XIII), to be held in Houston, Texas, May 22-24, 2013.
PhD Positions(In-situ TEM and Multi-physics of nanoscale thin films) in Mechanical Engineering at UC, RiversideSubmitted by sandeepkumar on Mon, 2012-10-08 17:32.
At least 2 PhD positions are available at Nanomechanics and Multi-physics Lab at UC, Riverside. Selected students will develop an in-situ TEM experimental setup using nanofabrication techniques and carry out experiments to understand the material behavior of nanoscale thin films. Students with background in material science are highly encouraged to apply.
or contact me - email@example.com
Effects of Composition and Thermal Annealing on the Mechanical Properties of Silicon Oxycarbide FilmsSubmitted by duping812 on Mon, 2012-08-27 20:45.
Sensors and Actuators A: Physical
Vol 176, Page 90-98.
Professor Gregory B. Thompson at the University of Alabama seeks post doctoral applicants for thin film and grain growth modeling in metal alloys. The qualified candidate will use modeling to explain and help direct experimental studies. The candidate will primarily focus on understanding how chemical partitioning contributes to stress evolution during physical deposition in metallic films as well as grain growth in metallic alloy systems. The candidate will be able to directly link his/her modeling results to in situ, real time experimentally captured data and advanced analytical microscopy characterization, including atom probe tomography. The post doc should be versed in using molecular dynamics, kinetic monte carlo or related approaches.
We have several postdoctoral positions opening now and in the coming months. We are especially interested in candidates with backgrounds in theoretical biomechanics who are interested in conducting bench experiments. These positions will focus on our efforts to recapitulate organ-level function on microchips for drug discovery and physiological studies.
We are writing to invite you to submit abstracts to the symposium "Mechanics of Thin Film and Multilayer Structures" (Symposium IV.11) at the upcoming SES 49th Annual Technical Meeting to be held in Georgia Tech during Oct. 10-12, 2012.
This symposium will encompass recent developments in analytical, experimental and numerical analysis of mechanics of thin film and multi-layer materials. Topics of interests include, but are not limited to stress and deformation in thin films and their measurement, mechanical properties, fracture and fatigue, interfacial delamination, adhesion, hardness, toughness, creep, thin film patterning, mechanical stabilities and reliability.
This chapter summarizes our works on surface wrinkling of elastic thin films, taking a kinetics approach as a physical pathway to both ordered and disordered wrinkle patterns.
I am graduated from Physics departmentOran
University, Algeria in june 2000. Then I complete my MSc in the field of
material science from the Oran University, Algeria in November 2004. Recently I
complete Ph.D. thesis at the university of Duisburg-EssenUniversity germany,
thermodynamic department in July 2011 . In my PhD, I deal with the synthesis and characterization of the
functional doped metal oxides.
Using a fiber-based optical profilometer NASA measures the thickness of liquid nitrogen in cryogenic chambers at its Propulsion Systems lab because these profilometers use fiber-based probes which can withstands the extreme environment, can be located hundreds of meters away from the interferometer and fit in the tight chamber which standard full-field profilometers with a human operator could not. The signal quality stays constant over the distance.
Welcome to February 2012's Journal club, which will include a discussion on elastic instabilities for form and function. Not long ago, the loss of structural stability through buckling generally referred to failure and disaster. It was a phenomenon to be designed around, and rarely did it provide functionality*. The increasing focus on soft materials, from rubbers and gels to biological tissues, encouraged scientists to revisit the role of elastic instabilities in the world around us and inspired their utilization in advanced materials. Now the field of elastic instabilities, or extreme mechanics, brings together the disciplines of physics, mechanics, mathematics, biology, and materials science to extend our understanding of structural instabilities for both form and function. In this journal club, we're going to look at research on the wrinkling, crumpling, and snapping of soft or slender structures.
I have a Ph.D. in Engineering Physics (January 2011) and as a result I am looking for a postdoc probably in the area of mechanical proerties of thin films. The title of my Ph.D. thesis is Synthesis and Characterization of Metal Organic Chemical Vapor Deposited Mo-S Thin Films. The aim was to prepare a single solid source precursor for the thin film; characterized the precursor; test the suitability of the pyrolysis of the precursor; determine the working condition that will give the best Mo-S thin film; characterized the Mo-S thin films; study the compositional, chemical, optical, electrical, structural, morpholigical, mechanical and tribological properties of the Mo-S thin films.
As technology constantly advances there are many new green technologies released each day that can help us improve our energy efficiency. One such technology is the "Thin-Film Solar Panel." How are thin-film solar panels being utilized by consumers today? How do they compare against traditional photovoltaic (PV) panels?
The surface effect on the strain energy release rate of buckling delamination in thin film–substrate systemsSubmitted by tongqing.lu on Wed, 2011-09-21 22:36.
Gurtin–Murdoch continuum surface elasticity model is employed to study the buckling
delamination of ultra thin film–substrate system. The effects of surface deformation and
residual stress on the large deflection of ultra thin film are considered in analysis. A
concept of effective bending rigidity (EBR) for ultra thin plate is proposed on the basis of
Gurtin–Murdoch continuum theory and the principle of minimum potential energy. The
governing equations with EBR are formally consistent with the classical plate theory,
including both small deflection and large deflection. A surface effect factor is introduced
to decide whether there is need to consider the surface effect or not. Combining the buckling
Hello Everybody here :
I am going to use ANSYS to do some finite element simulations of interface crack between
Everybody knows that cardboard paper can be a highly
anisotropic material. You can easily bend or roll it in one direction
and it is stiff in the other. If you take a close look you will find
that the paper is periodically buckled along one direction. We have now
exploited this phenomenon on the nanoscale to define the roll-up
direction of ultra-thin membranes on a substrate surface.
The intrinsic manipulation of thin inorganic or organic nanomembranes (including graphene)
on substrate surfaces has attracted great attention over recent years, since it allows to shape
two-dimensional layers into functional 3D objects of virtually any material, geometry and size.