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elasticity

exw569's picture

Postdoctoral position in nanomechanics of 2D nanomaterials

The School of Engineering and Materials Science at Queen Mary University of London has a vacancy for a Postdoctoral Research Assistant (PDRA) to develop computational models of ultra-flexible 2D nanomaterials in sheared liquids, using techniques borrowed from computational fluid and solid mechanics.

zichen's picture

Mechanical Self-Assembly of a Strain-Engineered Flexible Layer: Wrinkling, Rolling, and Twisting

Self-shaping of curved structures, especially those involving flexible thin layers, is attracting increasing attention because of their broad potential applications in, e.g., nanoelectromechanical andmicroelectromechanical systems, sensors, artificial skins, stretchable electronics, robotics, and drug delivery.

Sung Hoon Kang's picture

Multistable Architected Materials for Trapping Elastic Strain Energy

3D printing and numerical analysis are combined to design a new class of architected materials that contain bistable beam elements and exhibit controlled trapping of elastic energy. The proposed energy-absorbing structures are reusable. Moreover, the mechanism of energy absorption stems solely from the structural geometry of the printed beam elements, and is therefore both materials- and loading-rate independent.

zichen's picture

Residual Stresses and Poisson’s Effect Drive Shape Formation and Transition of Helical Structures

Strained multilayer structures are extensively investigated because of their applications in microelectromechanical/nano-elecromechanical systems. Here we employ a finite element method (FEM) to study the bending and twisting of multilayer structures subjected to misfit strains or residual stresses. This method is first validated by comparing the simulation results with analytic predictions for the bending radius of a bilayer strip with given misfit strains.

Davide Bigoni's picture

Torsional locomotion

Can a torque induce longitudinal motion of an elastic rod?

See the explanation and an example of use of the 'torsional gun' at http://www.ing.unitn.it/~bigoni/torsional_locomotion.html

If you're having trouble playing videos on YouTube, click here to watch it.

Amir Abdollahi's picture

A computational study of flexoelectricity

Flexoelectricity is a size-dependent electromechanical mechanism coupling polarization and strain gradient. It exists in a wide variety of materials, and is most noticeable for nanoscale objects, where strain gradients are higher. Simulations are important to understand flexoelectricity because experiments at very small scales are difficult, and analytical solutions are scarce.

Davide Bigoni's picture

Elastica arm scale

Can configurational forces be exploited to design a new type of scale?

See the explanation and an example of use at http://www.ing.unitn.it/~bigoni/elasticscale.html

If you're having trouble playing videos on YouTube, click here to watch it.

 

Imperfection in a Riks Analysis (ABAQUS)

I am performing a nonlinear post buckling using Riks method. I went through different tutorials for the same. I happen to see that an *IMPERFECTION is introduced while performing the non linear buckling analysis.Why is it done? How does/will the model react differently if the Imperfection is no introduced?

I wish to plot the graph of load v/s displacement for 1,2,3,4...10 times the critical buckling load during the post buckling analysis (Riks method). How do I do that?

Numerical approximation of tangent moduli

 

In this study, we presented a numerically robust procedure to evaluate 4th order tangent moduli which are vital for acheiving quadratic convergence of global Newton-Raphson scheme.

In this study, the proposed method is verified for hyperelastic models alone. However, the same can be extended to other constitutive models.

The paper can be found at

Numerically approximated Cauchy integral (NACI) for implementation of constitutive models

10.1016/j.finel.2014.05.016

Davide Bigoni's picture

Stress concentration near stiff inclusions

Do singular stress fields exist close to rigid corners?

See the photoelastic investigation at http://www.ing.unitn.it/~bigoni/stiffener.html

Oden Warren's picture

UPDATED: Nanobrücken 2014 Nanomechanical Testing Workshop

Dear Colleague: You are cordially invited to participate in the Nanobrücken 2014 Nanomechanical Testing Workshop, which will take place March 26-28, 2014 at INM - Leibniz Institute for New Materials in Saarbrücken, Germany. This will be the 4th edition of the annual Nanobrücken workshop series. This year's Keynote Speaker will be Andrew Minor (University of California, Berkeley).

Residual stresses in elastic medium upon uniform cooling

Hi All,

I am a student working on a project involving the effect of residual stresses in elastic and viscoealstic materials. I have a related question: When an easltic body is heated to a certain temperature (say 400 deg C) and then cooled uniformly to room temperature (20 deg C) with a constant cooling rate "q", does this generate any "un-desirable" (residual) stresses within the elastic body? i.e at a steady state - room temperature, does the final stress state within the body would be non-zero? Else, it would eventually reach a state of zero stresses? How?  

danial_faghihi's picture

Symposium in IMECE 2014, Montreal, Canada

Dear Colleagues,
 
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 2014 International Mechanical Engineering Congress and Exposition in Montreal, Canada ( http://www.asmeconferences.org/congress2014/).
 

Oden Warren's picture

Nanobrücken 2014 Nanomechanical Testing Workshop

The Nanobrücken 2014
Nanomechanical Testing Workshop
will take place March 26-28, 2014 at INM -
Leibniz Institute for New Materials in Saarbrücken, Germany. This will be the
4th edition of the now-annual Nanobrücken workshop series. This year's 
Keynote Speaker will be Andrew Minor (University of California, Berkeley).

Analysis problem on ansys 14.5

I am a student using ansys for solve problems but i have a problem "how to find at which force value the component will be fail". A ball has to pass through a cone and i am intrested to know that force value at which boll will be pass through cone nerrow section while boll diameter is large than small dia of cone.

 

Plz help me anyone ansys masters

Thanks dear frnd & sir... 

Question

I just was wondeing what is the physical meaning of K (bulk modulus) going to zero? does anyone know any materials with very small bulk modulus?

ASME-AMD Summer Meeting 2013: Dynamic Stability of Structural Systems

Dear Colleague:

The 2013 summer meeting of ASME Applied Mechanics Division will be held jointly with the Society of Engineering Science at Brown University, Providence, RI, July 28-31. We are pleased to invite you to a session on Dynamic Stability of Structural Systems, under the symposium on Instability in Solids and Structures that is being organized by the AMD Technical Committee.

Zhigang Suo's picture

Elasticity of rubber-like materials

In the notes on the general theory of finite deformation, we have left the free energy function unspecified. The notes here describe free energy function commonly used to describe the elasticity of rubber-like materials.  These notes are part of a course on advanced elasticity

Andrew Bunger's picture

Senior Research Scientist in hydraulic fracturing/geomechanics

CSIRO division of Earth Science and Resource Engineering is seeking a Senior Research Scientist in hydraulic fracturing/geomechanics. The position is located in Melbourne, Australia and the successful candidate will play a leading role in a world class hydraulic fracturing laboratory facility and in a hydraulic fracturing research team that integrates modelling with experimentation at laboratory and field scales.

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