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elasticity

Shengyou Yang's picture

Flexoelectricity as a universal mechanism for energy harvesting from crumpling of thin sheets

Can the mere crumpling of a paper produce electricity? An inhomogeneous strain can induce electrical response in all dielectrics and not just piezoelectric materials. This phenomenon of flexoelectricity is rather modest unless unusually large strain gradients are present. In this paper, we analyze the crumpling of thin elastic sheets and establish scaling laws for their electromechanical behavior to prove that an extremely strong flexoelectric response is achieved at submicron length scales.

nassarh's picture

Fully Funded PhD Position on Mechanical Metamaterials at the University of Missouri, Columbia

The position: I am looking to support a PhD student to work with me towards the design, modeling, fabrication and testing of mechanical metamaterials with emphasis on morphing structures such as origami tessellations and lattice materials. The study will focus on deriving and validating novel stress-strain relationships that transcend the standard framework of Hook's law. Sought applications will be in the domains of (i) self-deploying space structures; (ii) soft robotics; and (iii) "invisibility" cloaks.

nassarh's picture

PhD positions on mechanics of morphing solids and shells at the University of Missouri, Columbia

The positions: I am looking to support two PhD students to work with me towards a mechanical understanding of morphing structures such as origami tessellations and lattice materials and metamaterials. By "understanding" I mean anything relevant to the theoretical and numerical modeling of these structures, in static and dynamic regimes, within the context of elasticity whether linearized or not as well as the fabrication and testing of toy models necessary to assess that "understanding".

CAD-Analysis Isogeometric Analysis Post-doc and Software Developer sought to develop a CAD-Analysis simulation prototype Proof of Concept FNR

The http://legato-team.eu in Luxembourg

1) a post-doctoral fellow for 18 months (very competitive salary) to develop accelerated IGAFEM IGABEM and GIFT technology

2) a C++ software developer for 19 months (very competitive salary) to develop a user interface and accelerate the code

The candidates should

1) have some knowledge of IGA, isogeometric analysis or geometry independent field approximation

2) have excellent C++ coding skills

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.

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