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Journal Club Theme of May 2012: Hierarchical and Quasiperiodic Phononic Crystals and Metamaterials
Submitted by gtg627e on Tue, 2012-05-01 18:00.Following last month’s blog by Mahmoud on the role of structure in the design of materials capable of controlling the propagation of mechanical waves, I would like to delve into the characteristics of the structure itself. The propagation of mechanical waves can be controlled via scattering induced by a material’s structure.The propagation of waves for example is significantly disturbed when their wavelength and direction become correlated with the medium’s structure. This is known as Bragg scattering and can be achieved simply by embedding voids or inclusions (of different physical properties) in a material [1].
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Journal Club Theme of April 2012: Phononics: Structural Dynamics of Materials
Submitted by mihussein on Sun, 2012-04-01 02:43.Engineering structures are made out of materials and as such there is a natural hierarchy in which a material’s intrinsic properties contribute to shaping up the structure’s response. It is possible however to reverse this hierarchy and engineer materials that are made out of structures. In this case, the intrinsic properties of a material are shaped by the structural response. Such a configuration can only be realized with a repeated structure, forming an array of identical unit cells.
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Journal Club Theme of December 2011: Mechanics of Porous Materials
Submitted by john.balk on Tue, 2011-12-06 16:24.Porous materials can be created by a variety of methods and exhibit properties that are advantageous in certain applications, e.g. insulation, energy absorption, and core materials in sandwich panels. As the length scale of the pores/ligaments is reduced below one micron, size effects arise and cause changes in the deformation mechanisms that operate in the ligament material. The mechanical properties can change dramatically, especially for so-called “nanoporous metals”, which have pores and ligaments as small as a few nanometers.
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Journal Club Theme of November 2011: Hierarchical Mechanics of Diatom Algae: From Atoms to Organism and Weakness to Strength
Submitted by Leon Dimas on Wed, 2011-11-02 05:53.Hierarchical Mechanics of Diatom Algae: From Atoms to Organism and Weakness to Strength
This month’s iMechanica Journal Club theme is the hierarchical structure and mechanics of diatom algae, silicified organisms that use silica (“sand”) – abundantly available in the ocean – to construct strong, tough and stiff structures [1-10]. The interest in this area has been revived recently given recent advances in the combined measurement, modeling and synthesis of these materials, leading to exciting research being conducted at the interface of mechanics and biology.
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AFM in Nano-Biomechanics (October Journal Club Topic)
Submitted by Majid Minary on Fri, 2011-09-30 17:37.Introduction:
The October 2011 journal club theme is "AFM in Nano-biomechanics". Nano-biomechanics is an emerging field that aims at exploring fundamental science and engineering related to biological materials at the nanoscale (http://www.technologyreview.com/biomedicine/16475/ and http://en.wikipedia.org/wiki/Nanobiomechanics). Atomic force microscope (AFM) has been one of the instrumental tools in this field by providing pN force sensitivity, and better than nanometer spatial resolution.
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Journal Club Theme of August 2011: Energy Harvesting Using Soft Materials
Submitted by Adrian S. J. Koh on Mon, 2011-08-01 07:12.Energy harvesting is the process of converting energy that will otherwise be dissipated into the ambient environment, into useful energy to do work. I shall focus this discussion on motion-based energy harvesting. Motion-based energy harvesting is the process of converting dissipated mechanical energy into electrical energy. Sources of mechanical energy include the ocean waves, wind, human motion, vehicular traffic, and vibrations in buildings and bridges. This source of energy is ubiquitous and pervasive, and yet, it is one of the least developed energy harvesting technology.
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Journal Club Theme of July 2011: Three Dimensional Biologically Inspired Microvascular Systems
Submitted by Howon Lee on Fri, 2011-07-01 13:15.From venation of leaves to the blood and lymph vessels and tracheae of insects, 3D filamentous branching networks are a common pattern in all higher organisms. These busy “highways” supply the tissue with nutrition and oxygen, expel waste and heat, as well as conduct immune reactions and other signal pathways. These microvascular networks are also essential for effective response of external stimuli in some sensitive plants, such as Venus flytrap and Mimosa pudica.
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Journal Club Theme of June 2011: Dynamic Mechanical Behavior of Advanced Structural Materials
Submitted by qwei on Fri, 2011-05-27 14:30.The response of structural materials to external mechanical load may strongly depend on the rate at which the load is imposed. For example, a specimen may exhibit ductile fracture if loaded at quasi-static rate (strain rate below 1.0/s), but may show brittle fracture under impact (high-rate) loading. According to the classic monograph of Professor Marc Meyers, if the strain rate is above 100/s, it can be put into the high-strain rate regime. The mechanical behavior of structural materials under such loading conditions is dubbed dynamic.
Investigations into the dynamic behaviors of materials dates back to the 19th century. It was shown that stress wave propagation becomes predominant.
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Journal Club Theme of May 2011: Nanoscale Electromechanics and Piezoresponse Force Microscopy
Submitted by jiangyuli on Sun, 2011-05-01 04:38.Coupling between electrical and mechanical phenomena is ubiquitous in nature and underpins the functionality of materials and systems as diversified as ferroelectrics and multiferroics, electroactive molecules, and biological systems. In ferroelectrics, electromechanical behavior is directly linked to polarization order parameter and hence can be used to study complex phenomena including polarization reversal, domain wall pinning, multiferroic interaction, and electron-lattice coupling. The very basis of functionalities of biological systems is electromechanics - from nerve-controlled muscle contraction on macroscale to cardiac activity and hearing on microscale and to energy storage in mitochondria, voltage-controlled ion channels and electromotor proteins on nanoscale. More broadly, electromechanical coupling is a key component of virtually all electrochemical transformations, and is a nearly universal part of energy conversion and transport processes. It forms a basis for many device applications, and is directly relevant to virtually all existing and emerging aspects of materials science and nanobiotechnology.
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suo group research
Submitted by Zhigang Suo on Wed, 2007-08-01 23:14.- RSS feed for the posts: http://imechanica.org/taxonomy/term/85/0/feed
- RSS feed for comments: http://imechanica.org/crss/term/85
- Full list of PDF files of papers from the Suo Group
- Slides of research presentations
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RSS feeds for the Job Channel
Submitted by Managers on Wed, 2007-02-28 01:47.You will be alerted whenever someone posts to the Job Channel if you subscribe to RSS feeds.
The RSS feed for this Channel:
http://imechanica.org/taxonomy/term/73/0/feed
Learn how to subscribe to RSS feeds. They are easy, effective, and free.
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Complex interplay of nonlinear processes in dielectric elastomers.
Submitted by Jian ZHU on Wed, 2012-05-16 22:18.
A
combination of experiment and theory shows that dielectric elastomers exhibit
complex interplay of nonlinear processes. Membranes of a dielectric elastomer
are prepared in various states of prestretches by using rigid clamps and
mechanical forces. Upon actuation by voltage, some membranes form wrinkles
followed by snap-through instability,
others form wrinkles without the snap-through instability, and still others
fail by local instability without formingwrinkles.Membranes surviving these
nonlinear processes are found to attain a constant dielectric strength,
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thermal ratchetting with abaqus
Submitted by s_h on Wed, 2012-05-16 20:39.i am working to thermal ratchetting preaaure vesseles and pipes
and I'm doing with the software abaqus(combined hardening model)
but i have problem:
i use 2 step in abaqus
1-general-static for pressure
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Good Vibration for Cancer Diagnosis
Submitted by Kilho Eom on Wed, 2012-05-16 15:01.- Kilho Eom's blog
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piping fracture modeling with abaqus
Submitted by George Qian on Wed, 2012-05-16 13:28.Dear all,
I am a beginner with Abaqus (Version 6.11) and trying to model a piping with a crack. However, the mesh in the vicinity of the crack tip is not what desired. I checked it for quite a while but failed to find the reasons. I saw there have been some discussions here about this topic and hope can get hints from you. Thanks in advance.
I attached the desired mesh, along with the jnl file.
Best regards,
George Qian
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Tensile stresses in an elastic body accelerated by an attractive body force
Submitted by Jayadeep U. B. on Wed, 2012-05-16 07:48.Dear all,
Can someone suggest me literature where the problem "tensile stresses developed in an elastic body accelerated by an attractive body force" is discussed. The situation is similar to finding the stresses developed in a celestial body falling into black hole (though my interest is in impact with adhesive forces).
The problem is about solving the inhomogeneous wave equation, where inhomogeneous part is due to the attractive force. So any helpful hints in that direction will also be useful.
Also, it is clear that tensile stresses will develop only if the attractive force has a gradient, since all the material elements of the body will accelerate uniformly otherwise (free-fall).
Thanks,
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The Sandia Fracture Challenge
Submitted by blboyce on Tue, 2012-05-15 22:24.- blboyce's blog
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Two funded PhD studentships in Impact Engineering at Oxford University
Submitted by CliveSiviour on Tue, 2012-05-15 17:06.The Department of Engineering Science at Oxford University has recently obtained funding for a project to develop novel experimental techniques for characterising and modelling the response of rubber-like materials to impact loading. The project will support two studentships, supervised by Dr Clive Siviour in the Solid Mechanics and Materials Engineering Group.
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Seeking PhD Researcher in Biomedical Engineering - Computational Bone Mechanobiology/Tissue Engineering
Submitted by tedvaughan on Tue, 2012-05-15 16:18.
PhD
in Biomedical Engineering
Applications are invited for a postgraduate degree by research (PhD)
in Biomedical Engineering at the National University of Ireland Galway. The
project is funded by the European Research Council.
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Journal of the Mechanical Behavior of Biomedical Materials now accepts MATLAB figure files
Submitted by Laure Ballu on Tue, 2012-05-15 15:43.You can enrich your online articles by providing supplementary MATLAB figure files with the .FIG file extension. These files will be visualized using an interactive viewer that allows readers to explore your figures within the context of the article. The FIG files can be uploaded in our online submission system, and will also be available for downloading from your online article on SciVerse ScienceDirect.
For more information, go to http://www.journals.elsevier.com/journal-of-the-mechanical-behavior-of-biomedical-materials/journal-news/option-of-including-matlab-fig-files-now-available/
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Post processing of UEL Subroutine
Submitted by somusshabadi on Tue, 2012-05-15 13:26.Hello All,
I am Master student of Computational engineering at Ruhr University
Bochum, Germany. Presently I have UEL Subrouitne implemented for 9 NODE
Piezo-Electric Shell Element . I need to visualize the stress and
strain fields obtained from UEL Subroutine. I came accross "Creating
Contour Plots for UELs" in Lecture 6 Document of Abaqus Tutorial by DS
Simulia. There they achieve this by overlaying Dummy elements and dummy
materials. Has anyone tried this so far?
Would you also let me know, Should I have to write code to compute
stress and strains inside UEL subroutine manually and assign it to SVARS
at each integration points? I would greatly appreciate any little help.
Thanks and Regards,
Somu
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ICEFA V - Not too late to register at the Early Bird Rate - Deadline 18 May 2012
Submitted by Laure Ballu on Tue, 2012-05-15 10:32.Fifth International Conference on Engineering Failure Analysis, 1-4 July 2012, Hilton Hotel, The Hague, The Netherlands
To register, go to http://www.icefaconference.com
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Postdoctoral Position at Monash: Cracking Modelling
Submitted by Ha Bui on Tue, 2012-05-15 06:25.Hi All,
I am glad to inform you that:
A post-doctoral research position is available at the Geomechanics Group of
Monash Civil Engineering Department. You will be expected
to undertake numerical modelling into fracture of soil, in particular modelling
of crack evolution during desiccation. You will have a recent PhD in geomechanics, applied mechanics or in a related
field. Other qualifications include a strong background in
continuum/discontinuum mechanics and numerical modelling. Experience in
fracture mechanics modelling is desirable...
Further information about this possition can be found at:
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Run ABAQUS subroutines written in Fortran
Submitted by Jingwen Zhang on Mon, 2012-05-14 18:01.Dear colleagues,
I am a beginner in using ABAQUS subroutines, and currently come into the problem of running ABAQUS subroutines written in Fortran.
I have installed ABAQUS 6.11-1, Microsoft Visual Studio 2010, and Intel Visual Fortran Studio XE 2011 on my computer. However, when I run the test codes, there are the following errors:
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Dispense cuscinetti
Submitted by antonio.nuzzo76... on Mon, 2012-05-14 16:12.Dispense cuscinetti
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