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boechler's picture

Geometrically nonlinear microstructured materials for mechanical wave tailoring

Geometrically nonlinear microstructured materials for mechanical wave tailoring

Nicholas Boechler, Department of Mechanical Engineering, University of Washington 

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rajan_prithivi's picture

How are principal planes & eigen vectors of the stress tensor related ? | An intuitive explanation

To obtain the principal planes we construct the stress tensor and find the eigen vectors. Here is an attempt to explain it more intuitively rather than the use of the formal mathematical method. Hope you enjoy this video!
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This is an educational outreach initiative targeted at all engineers interested in mechanics and seek simpler explanations. Kindly share if you learn something out of this !

Here is the link to the VIDEO

Alejandro Ortiz-Bernardin's picture

Postdoctoral Fellowship (Computational Solid Mechanics)

I am looking for highly motivated candidates to fill some postdocs positions in computational solid mechanics in Chile.

Please see details here:

http://camlab.cl/2017/07/23/postdoctoral-fellowship-2018/

 

Best,

Alejandro.

 

Post-doctoral fellow in Chile's Legato Team

Possibilities for postdoctoral fellowships in Computational Mechanics with Elena Atroshchenko in collaboration within the Legato Team http://legato-team.eu

Please apply here: http://www.conicyt.cl/fondecyt/2016/09/06/concurso-postdoctorado-2018/

If you need information, please contact Elena Atroshchenko <eatroshchenko@ing.uchile.cl>

mohsenzaeem's picture

Generalized stacking fault energies, ductilities, and twinnabilities of CoCrFeNi-based face-centered cubic high entropy alloys

Effects of Cu, Mn, Al, Ti, Mo on generalized stacking fault energies, Rice-criterion ductilities, and twinabilities of CoCrFeNi-based face-centered cubic high entropy alloys were investigated using density functional theory calculations. The calculated barrier energies and twinnabilities revealed that the addition of Ti or Mo increased the tendency of dislocation glide and deformation twinning, while addition of Mn, Cu and relatively high amount of Al facilitated dislocation gliding and martensitic transformation. Low amount of Al resulted in only dislocation gliding.

Mike Ciavarella's picture

Some Closed-Form Results for Adhesive Rough Contacts Near Complete Contact on Loading and Unloading in the Johnson, Kendall, and Roberts Regime

Michele Ciavarella  Yang Xu Robert L. Jackson

Some Closed-Form Results for Adhesive Rough Contacts Near Complete Contact on Loading and Unloading in the Johnson, Kendall, and Roberts Regime

Journal of Tribology Copyright VC 2018 by ASME JANUARY 2018, Vol. 140 / 011402-1

 

Recently, generalizing the solution of the adhesiveless random rough contact proposed

by Xu, Jackson, and Marghitu (XJM model), the first author has obtained a model for

adhesive contact near full contact, under the Johnson, Kendall, and Roberts (JKR)

Dependence of Equilibrium Griffith Surface Energy on Crack Speed in Phase-Field Models for Fracture Coupled to Elastodynamics

Phase-field models for crack propagation enable the simulation of complex crack patterns without complex and expensive tracking and remeshing as cracks grow. In the setting without inertia, the crack evolution is obtained from a variational energetic starting point, and leads to an equation for the order parameter coupled to elastostatics. Careful mathematical analysis has shown that this is consistent with the Griffith model for fracture. Recent efforts to include inertia in this formulation have replaced elastostatics by elastodynamics.

Mike Prime's picture

Amplified effect of mild plastic anisotropy on residual stress and strain anisotropy

A few of you might find this interesting. We indented a disk of aluminum in order to make a specimen with residual stress. The loading was axisymmetric. The aluminum had plastic anisotropy of about 10%. Because of that mild anisotropy, the residual stresses were anisotropic by about 40% and the residual strains were anisotropic by 100%.

The paper is free until July 31 at https://authors.elsevier.com/a/1VCA54kE0BEFT

Ruobing Bai's picture

Fatigue fracture of tough hydrogels

Dear colleagues,

Attached please find our new paper "Fatigue fracture of tough hydrogels" published on Extreme Mechanics Letters.

 

Fatigue fracture of tough hydrogels

Ruobing Bai, Quansan Yang, Jingda Tang, Xavier P. Morelle, Joost Vlassak, Zhigang Suo

cemalbasaran's picture

Scientists report solving one of the oldest problems in mechanics

Being able to accurately predict the life span of physical bodies, both living and non-living, has been one of humankind’s eternal endeavors.  Over the last 150 years, many attempts were made to unify the field of Newtonian mechanics  and thermodynamics,  in order to create a generalized and consistent theory of evolution of life-span.

 

ESIS's picture

Discussion of fracture paper #16 - What is wrong with pure mode I and II? A lot it seems.

It is common practice when solving boundary value problems to split the solution into a symmetric and an antisymmetric part to temporarily reduce the number of variables and the mathematical administration. As soon as the symmetric problem is solved, the antisymmetric problem, or vice versa, is almost solving itself. Any problem can be split into a symmetric and an antisymmetric part which is a relief for anyone who analyses mixed cases.

Phd and postdoc position in thermographic inspection of composites @ Ghent University (Belgium)

We are looking for a PhD and postdoc researcher in thermographic inspection of composites, in the context of NDT (NonDestructive Testing) and defect detection.

More information can be found on http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo....

Oleg Kirillov's picture

Abstract submission is open for MS-7-4 at ESMC 2018, deadline November 15, 2017

MS-7-4

http://www.esmc2018.org/drupal8/node/93

Mini-Symposium 7-4 - Instabilities in Structural Mechanics and Fluid-Structure Interactions at ESMC 2018 in Bologna. Deadline for abstract submission: November 15, 2017. Organizers: Oleg Kirillov (Northumbria University), Olivier Doare (ENSTA Paristech). Mini-symposium description:

Transportation Network Controllability PhD studentship in the Department of Computational Engineering Sciences at the University of Luxembourg

There is a PhD position in Computational Engineering and Science offered at the MobiLab Transport Research Group of the University of Luxembourg! We look for a passionate researcher who wants to study network controllability in transportation systems for 3(+1) years. If you are interested go to http://emea3.mrted.ly/1gy60

Controllability of Transportation Networks

Zhaohe Dai's picture

Measuring Interlayer Shear Stress in Bilayer Graphene

Monolayer two-dimensional (2D) crystals exhibit a host of intriguing properties, but the most exciting applications may come from stacking them into multilayer structures. Interlayer and interfacial shear interactions could play a crucial role in the performance and reliability of these applications, but little is known about the key parameters controlling shear deformation across the layers and interfaces between 2D materials. Herein, we report the first measurement of the interlayer shear stress of bilayer graphene based on pressurized microscale bubble loading devices.

Laurence Brassart's picture

EMMC16, March 26-28, Nantes, France - Session on Coupled Problems in Material Mechanics

Dear colleagues,

We would like to draw your attention to the following session at the 16th European Mechanics of Materials Conference (EMMC16) to be held in Nantes, March 26th-28th, 2018:

S10: Coupled Problems in Material Mechanics 

A short description of the session topics is provided below. 

The deadline for submitting an abstract is September 30, 2017.

Please refer to the conference website for details: 

https://emmc16.sciencesconf.org/

AS's picture

PhD position at the University of Brescia on the Chemo-Mechanics of Angiogenesis

The Multiscale Mechanics and Multiphysics of Materials Lab (http://m4lab.unibs.it) at the School of Engineering at the University of Brescia, Italy announces a PhD fellowship on the subject of Chemo-Mechanics of Angiogenesis. The student, who must have graduated in a non-Italian institution, will be co-advised by Proff. A. Salvadori, S. Mitola, and other colleagues. The candidate will work at the forefront of experimental and modeling in the vibrant area of cell motility and receptor-ligands interactions.

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