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Journal Club: Overcoming Challenges in Mechanically Actuating Liquid-Crystalline Elastomers

Smart materials are designed to have a controlled response to external stimuli. Shape-memory polymers (SMPs) are one of the most well known classes of mechanically active smart materials and have experienced an incredible amount of research attention over the last decade. They are able to recover programmed deformations when heated above a thermal transition; however, are generally considered a one-time event. Liquid-crystalline elastomers (LCEs) are another class of actively moving polymers; however, these materials can demonstrate reversible and repeatable shape memory without the need for “re-programming” after each actuation cycle.

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chenlei07's picture

Coupling GSM/ALE with ES-FEM-T3 for fluid-deformable structure interactions

In light of the effectiveness of the edge-based smoothed finite element method (ES-FEM-T3) and arbitrary Lagrangian-Eulerian gradient smoothing method (GSM/ALE) in, respectively, solving the pure solid and fluid flow problems using three-node triangular elements, they are coupled together in the present study to solve the more challenging fluid-deformable structure interaction (FSI) problems based on the weak coupling algorithm.

Research Associate in Dislocation Modelling (Fixed-term for 48 months)

Modelling of Dislocation-Microstructure Interaction at a Short Crack Tip

This project aims to model dislocation-microstructure interaction at a crack tip and associated short crack growth for nickel alloys.

critical stress for delamination in multilayers

could someone tell me some equation to get the critical stress for delamination in multilayers?

Thanks,

 

Question on Fatigue crack growth C and m Paris Law

Are m and C in the paris law equation dependant on the material property or geometry?

For example if using the same material with different thickness, do the C and m values change? For clarity assume centre notched plates, with different plate thicknesses but same material (steel or aluminium).

 

I appreciate your time.

 

 

One of the Most Productive Collaborations in Physicals Sciences of All Time

Written by Kent McDill

posted in Illinois, Northwestern, LiveBIG (Big Ten Network July 20, 2014)

 

The human heart is one of the most incredible natural phenomena in existence. The ways in which it powers various functions of the human body is one of the great wonders of life. Yonggang Huang and John Rogers, professors at Northwestern University and the University of Illinois, respectively, have spent much of their careers studying this amazing organ.

Highly cited researchers in solid mechanicians.

Thomson Reuters has released a new list of highly cited researchers. You can find more at http://highlycited.com/index.htm#table

The following solid mechanicians have been selected in the catagory of engineering, materials science, or computer science.

Satya Atluri (UC Irvine);

Yuri Bazilevs (UCSD);

Ted Belytschko (Northwestern University);

Yonggang Huang (Northwestern University);

Tom Hughes (University of Texas at Austin);

John Hutchinson (Harvard University);

Gui-rong Liu (University of Cincinnati);

Wing Jam Liu (Northwestern University);

Nichlas Moes (Ecole Centrale de Nantes, France);

Zhigang Suo (Harvard University);

Tayfun Tazduyar (Rice University);

Ultra-Strong Collagen-Mimic Carbon Nanotube Bundles

 In spite of worldwide research, carbon nanotubes (CNTs) still have not fully realized their

 original promise as ideal reinforcements for composite materials due to a number of

 challenging issues such as weak interface, poor dispersion, misalignment and lack of optimized

 design. Here we propose a bio-inspired structure of CNT bundles with controllable

 crosslink density and staggered pattern of organization that mimic the architecture of

 natural collagen fiber. Molecular mechanics (MM) simulations show that, under tensile

Elastic Bounds of Bioinspired Nanocomposites

 Biological materials in nature serve as a valuable source of inspiration for developing

 novel synthetic materials with extraordinary properties or functions. Much effort to date

 has been directed toward fabricating and understanding bio-inspired nanocomposites

 with internal architectures mimicking those of nacre and collagen fibril. Here we establish

 simple and explicit analytical solutions for both upper and lower bounds of the elastic

 properties of biocomposites in terms of various physical and geometrical parameters

weibang's picture

Thomson Reuters has released a new list of highly cited researchers!

Thomson Reuters has released a new list of highly cited researchers for 2002-2012. You can find more at http://highlycited.com/index.htm#table 

The following solid mechanicians have been selected in the category of engineering, materials science, or computer science.

 

Satya Atluri (UC Irvine);

Yuri Bazilevs (UCSD);

Ted Belytschko (Northwestern University);

Yonggang Huang (Northwestern University);

Tom Hughes (University of Texas at Austin);

John Hutchinson (Harvard University);

Wenbin Yu's picture

Run GEBT online within a web browser

One can now run GEBT (Geometrically Exact Beam Theory), a general-purpose nonlinear composite beam solver, online within a web browser through cdmHUB.org. Users do not have to install the code on their own machine. And users can access to immediate support if run into any questions. You are welcome to try out the code and let me know any of your questions. 

I am fine

I didn't delete my posts. I learned from admin that they are archieved in a way that they cannot be displayed right now. But don't worry, things are beginning to roll. I got a long email from John today but haven't got time to read it carefully yet.

 

Ultimate Linear Motion Mechanism For Clean Energy

 

 

I apply force using one slider to another slider. Best part is one slider move little bit and help second slider to slide 6 times length at 70 % force.

Energy Used to move first slider=force*distance

=100N*0.05m

=5Nm

Energy Get on Other Slider= Force*Distance

=Force applied by first slider*cos(45`)*distance

=100*0.7*0.25

=17.5

We get 3 times energy on second slider than we use to move first slider.

Postdoctoral position - nonlinear dynamics

Indian Institute of Technology Gandhinagar (IITGN) invites applications for a postdoctoral position from motivated individuals interested in modeling and simulation research in Nonlinear Dynamics (supervised by Profs. Pratyush Dayal and Gaurav Srivastava). These applications are sought under Post-Doctoral Fellowships Program of IITGN. The candidate will be required to develop a fully functional suite of computational tools to perform multiphysics modeling and simulation studies on soft materials.

Amit Pandey's picture

Seminal research work: in-situ mechanical testing under electron microscope

A lot work has been done/published in the area of in-situ mechanical testing using electron microscopy. Please list which, according to what you feel has had a significant impact. Here are two in my opinion:

 Uchic, M. D., Dimiduk, D. M., Florando, J. N., & Nix, W. D. (2004). Sample dimensions influence strength and crystal plasticity. Science, 305(5686), 986-989.

iMechanica has been upgraded

Harvard IT has recently upgraded iMechanica to a new server.  In addition, iMechanica is now powered by a new version of Drupal.  These changes may affect your use of iMechanica.  Please let us know if you find something wrong.  Thank you.

Zhigang Suo's picture

Bioinspiration and biointegration

The nervous system has long been an inspiration for the engineer.  Here is an example in a popular textbook on neuroscience.  When a person steps on a nail, the sensor in his foot sends a signal to his brain, the brain sends a signal to his muscle, and he lifts his foot.  The example illustrates the sensor, actuator and processor in the nervous system.

EPFL - Faculty position in Structures and Materials

Faculty position in Structures and Materials

 

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

This research project is partially supported by the private sector, and is supervised by Annalisa Buffa and Giancarlo Sangalli.

Looking for a Postdoc position in the filed of vibration aided fault diagnosis

I am going to finnish my Ph.D. of mechanical engineering with a thesis in the field of vibration assisted fault diagnosis in about 3 months. My main field of research is vibration and I have worked extensively on gear systemes vibration modeling and diagnostics. 

Currently I am looking for a postdoc position at which I can continue my researches in the abovesaid fields.

my Email address is b_hoseini@kntu.ac.ir

Thanks

Cohesive Zone Model in ANSYS

Hello Everyone,

I am trying to model a propagation of fluid-driven crack in ansys apdl and I have the following questions:

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