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Journal Club for September 2017: Some recent developments in constitutive modeling of glassy polymers

The physics of glassy materials is a fascinating area of research. On one hand, the statistical mechanics understanding of their behavior is an active and exciting area of research. On the other hand, it is still quite challenging to develop and calibrate predictive constitutive models that reproduce all the observed behaviors. Many of the physical aspects the thermo-mechanics and ageing behavior of glasses are what actually make their constitutive modeling complex.

Twelfth International Conference on Fatigue Damage of Structural Materials

The twelfth biennial International Conference on Fatigue Damage of Structural Materials will be held in scenic Cape Cod at the DoubleTree by Hilton Hotel, Hyannis, Massachusetts from the 16-21 September 2018.

Ali Ghahremaninezhad's picture

Ph.D. Research Position

One Ph.D. research position is available immediately in the Advanced Materials Research Lab at the University of Miami to perform interdisciplinary research in the area of bio-inspired cementitious materials. Interested applicants are encouraged to send a CV to Dr. Ali Ghahremaninezhad via email at a.ghahremani@miami.edu.

stefanogonella's picture

PhD positions in mechanics of metamaterials at the University of Minnesota

PhD positions in the broad area of mechanics of advanced materials and metamaterials are available in the group of Prof. Stefano Gonella (http://personal.cege.umn.edu/~gonella/) at the University of Minnesota.

Current topics of interest include: 1) Nonlinear metamaterials, including soft architected lattices; 2) Topological and non-reciprocal metamaterials; 3) Tunable and programmable multifunctional materials and structures.

cmajidi's picture

Postdoc Opening in Soft Robotics Modeling at Carnegie Mellon

The CMU Soft Machines Lab is accepting applications for a postdoctoral appointment in computational modeling of soft multifunctional materials and robotics. The postdoc will lead efforts to develop a physics-based computational framework for modeling heterogenous systems and structures composed of elastomers, fluids, and compliant materials.

 

Laurence Brassart's picture

[Deadline: 30 Sep. 2017] EMMC16, March 26-28, Nantes, France - Session on Coupled Problems in Material Mechanics

Dear colleagues,

Just a quick reminder that the deadline for submitting an abstract to the upcoming 16th European Mechanics of Materials Conference (EMMC16) is approaching: 30th September.

I particularly draw your attention to the following session:

S10: Coupled Problems in Material Mechanics 

Please refer to the conference website for details:

https://emmc16.sciencesconf.org/

We look forward to meeting you in Nantes.

Zhigang Suo's picture

Thermodynamics in twenty-some slides for advanced elasticity

I am teaching Advanced Elasticity again.  Thermodynamics is involved in nontrivial ways in several topics, such as entropic elasticity and swelling hydrogels.

PhD Position in 'Intelligent design of 2D nanostructures based on molybdenum' project

Two PhD students will be engaged in a research project of National Science Centre (NCN) carried out in the Institute of Fundamental Technological Research PAS, Poland on 'Intelligent design of 2D nanostructures based on molybdenum'.  The materials with a 2D atomic structure (flat, one layer) have drawn attention of researchers for years.

Chiqun Zhang's picture

Finite element approximation of the fields of bulk and interfacial line defects

Chiqun Zhang            Amit Acharya            Saurabh Puri

A generalized disclination (g.disclination) theory [AF15] has been recently introduced that goes beyond treating standard translational and rotational Volterra defects in a continuously distributed defects approach; it is capable of treating the kinematics and dynamics of terminating lines of elastic strain and rotation discontinuities. In this work, a numerical method is developed to solve for the stress and distortion fields of g.disclination systems. Problems of small and finite deformation theory are considered. The fields of a single disclination, a single dislocation treated as a disclination dipole, a tilt grain boundary, a misfitting grain boundary with disconnections, a through twin boundary, a terminating twin boundary, a through grain boundary, a star disclination/penta-twin, a disclination loop (with twist and wedge segments), and a plate, a lenticular, and a needle inclusion are approximated. It is demonstrated that while the far-field topological identity of a dislocation of appropriate strength and a disclination-dipole plus a slip dislocation comprising a disconnection are the same, the latter microstructure is energetically favorable. This underscores the complementary importance of all of topology, geometry, and energetics in understanding defect mechanics. It is established that finite element approximations of fields of interfacial and bulk line defects can be achieved in a systematic and routine manner, thus contributing to the study of intricate defect microstructures in the scientific understanding and predictive design of materials. Our work also represents one systematic way of studying the interaction of (g.)disclinations and dislocations as topological defects, a subject of considerable subtlety and conceptual importance [Mer79, AMK17].

Feedback-Accelerated Picard Iteration for Orbit Propagation and Lambert’s Problem

This paper presents a new Feedback-Accelerated Picard Iteration method for solving long-term orbit propagation problems and perturbed Lambert’s problems. This method is developed by combining the collocation method and the variational iteration method over large-time-steps. The resulting iterative formulae are explicitly derived so that they can be directly adopted to solve problems in orbital mechanics. Several typical orbit regimes incorporating high-order gravity and air drag force are used to demonstrate the application of the proposed method in orbit propagation.

PhD Position (4 years) in Experimental Study of Nano-Composites

PhD Position (4 years) in Experimental Study of Nano-Composites

Center for Design, Manufactirung, and Materials, Skoltech, invites applications for a PhD position in Experimental Study of Nano Composites, starting in November 2017.

Zhengwei Li's picture

Harnessing Surface Wrinkling-Cracking Patterns for Tunable Optical Transmittance

Optical devices and systems with tunable optical transmittance have recently attracted great interest due to their wide range of applications. However, the reported methods of realizing tunable optical transmittance still suffer from complex fabrication processes, high cost, unstable materials or low tuning range. In this study, we report a simple, cheap, and highly effective approach to achieve large tuning range of optical transmittance through harnessing surface wrinkling-cracking patterns on PDMS films.

Konstantin Volokh's picture

On cavitation in rubberlike materials

Microscopic voids can irreversibly grow into the macroscopic ones under hydrostatic tension. To explain this phenomenon it was suggested in the literature to use the asymptotic value of the hydrostatic tension in the plateau yield-like region on the stress-stretch curve obtained for the neo-Hookean model. Such an explanation has two limitations: (a) it relies on analysis of only one material model and (b) the hyperelasticity theory is used for the explanation of the failure phenomenon.

Xuanhe Zhao's picture

NEW.Mech 2017 at MIT on October 14

New Mech

We would like to let you know that free registration for the upcoming 8th annual New England Workshop on the Mechanics of Materials and Structures (NEW.Mech 2017) is open now.  The NEW.Mech 2017 is taking place at MIT on October 14, 2017.

Stephan Rudykh's picture

[Deadline: Sept. 30] 16th European Mechanics of Materials Conference (EMMC-16) Nantes, France, March 26-28, 2018

Dear Colleagues, 16th European Mechanics of Materials Conference (EMMC-16) will be held in Nantes, France,  March 26th-28th, 2018. As part of this meeting, we are organizing a session (S9) to bring together experts in modelling, simulation, manufacturing and experimental investigation in the field of Functional and architectured materials to present and discuss recent advances.

pragtic's picture

WCFA workshop on Design and Fatigue of Weldments

This is the second announcement about the upcoming Workshop on Computational Fatigue Analysis 2017, this year dedicated to Design and Fatigue of Weldments (WCFA2017-DFW - http://www.pragtic.com/DFW.php). The workshop is held in Prague, Czech Republic in November 13-16, 2017. The key lecturer, who guides the audience through various issues of the fatigue analysis in welds, is Dr Zuheir Barsoum from KTH - Royal Institute of Technology in Sweden.

Ali Ramazani's picture

Molecular dynamics study of phonon transport in graphyne nanotubes

We determine the thermal conductivities of a, b, and g graphyne nanotubes (GNTs) as well as of carbon
nanotubes (CNTs) using molecular dynamics simulations and the Green-Kubo relationship over the
temperature range 50e400 K. We find that GNTs demonstrate considerably lower thermal conductivity
than CNTs with the same diameter and length. Among a (alpha), b (beta), and g (gama)-GNTs, g-GNT has the highest thermal
conductivity at all temperatures. By comparing the phonon transport properties of GNTs with CNTs, we

Zhengwei Li's picture

Theoretical studies on lattice-oriented growth of single-walled carbon nanotubes on sapphire

In this work, a theoretical study is performed to quantitatively understand the van der Waals interactions between single-walled carbon nanotubes (SWNTs) and sapphire substrates. The energetically preferred alignment directions of SWNTs on A-, R- and M-planes and the random alignment on the C-plane predicted by this study are all in good agreement with experiments. It is also shown that smaller SWNTs have better alignment than larger SWNTs due to their stronger interaction with sapphire substrate.

Konstantin Volokh's picture

Understanding the strength of bioinspired soft composites

Remarkable mechanical properties of biocomposites (bone, teeth, shell, antler etc.) are usually attributed to their special design where staggered mineral platelets are embedded in a protein matrix. Because of the high aspect ratio of the platelet the soft protein deforms in the shear mode predominantly providing the linkage for the hard inclusions. Mimicking Nature one might design materials with a similar architecture. 

DEADLINE: September 15th, 2017 | AMD/ASME Awards - Call for nominations 2017

 REMINDER: The deadline for nominations for the AMD/ASME awards is September 15th, 2017.

Information and details on each of the awards are provided below.

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Two positions at the Mechanical Engineering Department at the University of British Columbia

Two positions are open for Ph.D. or Masters students in the Department of Mechanical Engineering at the University of British Columbia, Vancouver, Canada. The positions are joined with the Modeling and Simulation group and the Micro and Nano mechanics laboratory. We are looking for skilled and highly motivated individuals to pursue a Ph.D. or M.A.Sc. in the area of multiscale modeling of materials and solids mechanics. Two projects are available:

Giorgio Carta's picture

Gyro-elastic beams for the vibration reduction of long flexural systems

The paper presents a model of a chiral multi-structure incorporating gyro-elastic beams. Floquet–Bloch waves in periodic chiral systems are investigated in detail, with the emphasis on localization and the formation of standing waves. It is found that gyricity leads to low-frequency standing modes and generation of stop-bands. A design of an earthquake protection system is offered here, as an interesting application of vibration isolation. Theoretical results are accompanied by numerical simulations in the time-harmonic regime.

Mike Ciavarella's picture

1 phd position for NON-italian citizens at Politecnico di BARI - ITALY. Expires 12 sept

1 phd position for phd is reserved to non-italian citizens at Politecnico department of Mechanical engineering.

Attached the SELECTION CALL FOR ADMISSION TO THE RESEARCH DOCTORATE (Ph.D.) PROGRAMS – XXXIII CYCLE AT THE POLITECNICO DI BARI ACADEMIC YEAR 2017/2018 

Various options for research themes are available, also including solid mechanics, fatigue or contact mechanics.

See attachment or write for details at mciava AT poliba.it

Application expires on Sept.12 !!

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