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mortezaamjadi's picture

Piezoresistivity of Ag NWs-PDMS nanocomposite

In this work, we developed a conductive silver nanowire (AgNW)-PDMS composite thin film for a flexible strain sensing application. The piezoresistivity of AgNWs-PDMS nanocomposite thin film was experimentally investigated and analyzed by a computational model. The strain sensor shows a strong piezoresistivity with an average gauge factor in the ranges of 1.6 to 14 and a high stretchability up to 70 %. We found excellent agreement between our experiment and simulation results.

mortezaamjadi's picture

Carbon Nanotubes-Ecoflex Nanocomposite for Strain Sensing With Ultra-High Stretchability

We developed highly stretchable, flexible and very soft conductors based on the carbon nanotubes (CNTs)-silicone rubber (Ecoflex®) nanocomposite thin films. The resistance of the CNTs-Ecoflex nanocomposite thin film was recovered to its original value under cyclic loading/unloading for strains as large as 510%. Failure strain of the CNTs-Ecoflex nanocomposite was measured to be about ~ 1380% showing its ultra-high stretchability and robustness. As an application of our highly stretchable conductors, we utilized them as skin-mountable and wearable strain sensors for human motion detection.

mortezaamjadi's picture

Flexible and Sensitive Foot Pad for Sole Distributed Force Detection

In this work, we develop high flexible and compressible porous PDMS structures by using sugar cubes as templates. Force sensitive resistor (FSR) sensors were fabricated by the filtration of the CNT solution inside the porous structure of PDMS. We found that sufficient acid treatment can increase the adhesion between CNTs and PDMS. FSR sensors respond the applied pressure and compressive strains by high linearity (R2>0.97) and sensitivity (GFs>2) with a reliable manner.

Simpleware Animations Contest

Send us your image data and be in with the chance of winning a free animated video and a 3D printed model

How to Enter

Send us your image data and a quick description, and we will pick the best entry. A video will be produced that can be used to communicate your complex 3D models in presentations, or to simply show off your scans to colleagues.

fhuera's picture

FLUID-STRUCTURE INTERACTION PhD studentship at URV, Tarragona, Spain

The Laboratory for Fluid-Structure Interaction (LIFE) http://www.etseq.urv.es/life) of the Department of Mechanical Engineering at the Universitat Rovira i Virgili (URV) (www.urv.cat) in Tarragona (Spain), is looking for an enthusiastic research student with a strong interest in fluid dynamics. Successful candidates will join a small but very active multidisciplinary team, working in fluid-structure interaction problems.

PhD Position in Atomistic Simulations / Computational Nanomechanics

The Institute for General Material Properties of the Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) is seeking an outstanding PhD candidate to participate in a research-training group on in-situ microscopy on nanoscale objects.

 

Modeling Materials Short Course in Erlangen, Germany

 

WHAT

Five-day short course on the fundamentals of continuum, atomistic and multiscale modeling of materials.

WHO

Prof. Ellad B. Tadmor (U. Minnesota, USA) and Prof. Ronald E. Miller (Carleton University, Canada).

WHERE

Friedrich-Alexander-Universität (FAU), Erlangen-Nürnberg, Germany

  

Introduction to Simpleware, CEA Grenoble, June 10, 2015

Date: Wednesday, June 10, 2015

Time: 1:00 - 6:00 pm 

Location: Amphithéâtre Accueil du CEA Grenoble (Entrée 1 / Bâtiment A2 / Pièce 205) - Pôlygone Scientifique - 17, rue des Martyrs – GRENOBLE

Title: Effect of Hygrothermal Aging on the Mechanical Properties of Fluorinated and Nonfluorinated Clay-Epoxy Nanocomposites

Polymers absorb moisture due to their hydrophilicity. Absorption of moisture changes the functional, mechanical and chemical properties of the polymer. Since polymer based materials are being increasingly used for structural applications, its only fitting to investigate how moisture absorption translates to mechanical property change. This experimental study investigated the effect of moisture absorption on the mechanical properties of epoxy polymers and their clay nanocomposites. Previous research studies reported that the high aspect ratio of clay slowed down the absorption rate.

Dargazany's picture

PhD position in Mechanics of High Performance (bio)Materials

Our Group of High Performance Materials in Enviormental & Civil Engineering Department at Michigan State University has an openings for PhD positions to work on Multiscale Modeling of Soft Materials starting Spring 2016.

 

Postdoctoral Fellow - BioMEMS / Microfluidics

Applications are invited for a Postdoctoral Fellow in the Department of Mechanical Engineering at Northwestern University. The candidate will interact closely with personnel at the start-up company iNfinitesimal, LLC and collaborators at the Northwestern University Feinberg School of Medicine.  The position will involve research at the intersection of engineering and biology with an emphasis on development of nano and micro technologies for biological applications.

 

Postdoctoral Fellow - Mechanics of Nano and Biomaterials

Applications are invited for a postdoctoral position within the Micro and Nano Mechanics Laboratory in the Department of Mechanical Engineering at Northwestern University.  The candidate will perform research in the area of nanomechanics of high-performance materials such as 2D materials, nanowires, and biomaterials. The candidate will be expected to contribute to a vibrant multidisciplinary research group and be able to work in close collaboration with chemists and theoreticians.

 

tigerofmahdi's picture

Elastic wave propagation

Hi Dears:

Who works on Elastic wave propagation and its reflection? How I can fine the formolations of elastic wave after its reflection from arbitrary boundaries ?? Can you intruducing any refrences to me??

Giorgio Carta's picture

Dispersion properties of vortex-type monatomic lattices

The paper presents a systematic study of dispersive waves in an elastic chiral lattice. Chirality is introduced through gyroscopes embedded into the junctions of a doubly periodic lattice. Bloch-Floquet waves are assumed to satisfy the quasi-periodicity conditions on the elementary cell.

M. Shaat's picture

Pull-in instability of multi-phase nanocrystalline silicon beams under distributed electrostatic force

The effects of the material structure on the pull-in instability of nano-actuated beams made of nanocrystalline silicon (Nc-Si) and subjected to a distributed electrostatic force are investigated. Nc-Si is represented as a multi-phase material composed of nano-sized grains, nano voids, and an amorphous-like interface to consider the effects of the interface, grain size, porosity, and the inhomogeneities surface energies on the elastic properties of the composite material.

M. Shaat's picture

Modeling of mechanical resonators used for nanocrystalline materials characterization and disease diagnosis of HIVs

The modeling and performance of mechanical resonators used for mass detection of bio-cells, nanocrystalline materials characterization, and disease diagnosis of human immune-viruses (HIVs) are investigated. To simulate the real behavior of these mechanical resonators, a novel distributed-parameter model based on Euler-Bernoulli beam theory is developed. This model is equipped with a micromechanical model and an atomic lattice model to capture the inhomogeneity nature of the material microstructure.

M. Shaat's picture

Effects of grain size and microstructure rigid rotations on the bending behavior of nanocrystalline material beams

Due to the intensive decrease in grain sizes of nanocrystalline materials (NcMs), a large volume fraction of atoms reside in the interface regions between crystals forming an atom-cloud phase with a distinct atomic structure. Moreover, the surface to volume ratio of the grain increases, thus its surface energy will significantly affect the mechanical properties of NcMs.

 

M. Shaat's picture

Iterative nonlocal elasticity for Kirchhoff plates

Recently, the nonlocal elasticity theories have been used in studying the different behaviors of micro/nanostructures. However, there is a complicity in applying the natural boundary conditions in the context of the nonlocal differential elasticity models. Also, the nonlocal integral elasticity could provide a suitable remedy for this type of problems but with paying highly computational efforts.

 

M. Shaat's picture

Physical and Mathematical Representations of Couple Stress Effects on Micro/Nanosolids

In the present paper, for linear elastic materials, effects of couple stresses on micro/nanosolids are physically discussed and mathematically represented in the context of the classical, the modified and the consistent couple–stress theories. Then, an evaluation is provided showing the validity and the limit of applicability of each one of these theories. At first, the possible couple stress effects on mechanics of particles and on continuum mechanics are represented.

Which is the best model to capture brittle fracture and failure of ceramics at moderate velocities?

Several models have been developed over the past decades to capture the fracture and failure of ceramic materials. JH2, JHB models are widely used for simulating the behavior of armor plates upon ballistic impact. I have a doubt regarding these models. Are these models only valid when the impact velocity is in the order of 1000m/s, as under such circumstances material transitions from elastic to elastic-plastic regime defined by the HEL Pressure? But what about when the impact velocity of the ceramic is around 300-400 m/s (a fraction of ballistic impact)?

postdoctoral position - isogeometric analysis

IMATI-CNR and the Mathematics Department of the University of Pavia offer a postdoc position on isogeometric analysis. This research project focuses on the design and implementation of innovative isogeometric methods for solid/fluid mechanics.  In particular the target applications are related to

- nearly-incompressible and fibered materials

- fluids in geological formations

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