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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 

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

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.

3 PhD positions at the University of Trento

There are three PhD fellowships available in PhD Programme of Civil, Environmental and Mechanical Engineering (University of Trento) on the following topics:

1 Design, simulation and testing of smart metamaterials/metastructures for vibration mitigation of civil/mechanical systems

2 Modelling and simulation of novel opto-acoustic sensors for monitoring crack growth in pressure vessel steels

3 Laser-Beam Cutting Modeling and Testing For Improved Quality and High-Demanding Structural Applications

 

The deadline is 29 August 2017 at 4 pm CET.

 

AS's picture

Joint PhD position (UNIBS/ND) on energy storage materials

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 joint PhD fellowship between the Universities of Brescia (Italy) and Notre Dame (USA) on the subject of  Co-designed modeling and experimental investigations on electrodes modified with lithiated organic ligands. The student, who must have graduated in a non-Italian institution, will be co-advised by Prof. A. Salvadori (UNIBS) and J. Schaefer (ND).

hlfrandsen's picture

Postdoc on mechanical challenges in energy conversion technologies

Greetings 

We are looking for a new postdoc to work on mechanical challenges in energy conversation technologies.

If you are interested you can take a closer look at the job description here:

http://www.dtu.dk/job/job?id=977f380d-dbcd-41f5-a8cc-78315cff25e1

Best regards 

Henrik Lund Frandsen 

mohsenzaeem's picture

Effects of specimen size and yttria concentration on mechanical properties of single crystalline yttria-stabilized tetragonal zirconia nanopillars

The nanoscale plastic deformation of yttria-stabilized tetragonal zirconia (YSTZ) is highly dependent on the crystallographic orientations, i.e., dislocation is induced when the loading direction is 45° tilted to {111} and {101} slip planes, while tetragonal to monoclinic phase transformation dominates the plastic deformation when loading direction is perpendicular to the slip planes.

aerturk's picture

GRA (PhD student) positions on two NSF projects at Georgia Tech

Greetings - I am seeking two self-motivated PhD students for two separate NSF projects:

Project 1 is on nonlinear nonconservative dynamics of fiber-based flexible piezoelectric composites for complex 3D deformations (involves theory and experiments)

keywords: vibration, piezoelectricity, nonlinear, dissipation, plates, actuation

(a co-PI and another student will be on the fluid dynamics side of the multiphysics problem, involves strong collaboration)

Sabyasachi Chatterjee's picture

Computing Singularly Perturbed Differential Equations

Sabyasachi Chatterjee, Amit Acharya, Zvi Artstein

A computational tool for coarse-graining nonlinear systems of ordinary differential equations in time is discussed. Three illustrative model examples are worked out that demonstrate the range of capability of the method. This includes the averaging of Hamiltonian as well as dissipative microscopic dynamics whose ‘slow’ variables, defined in a precise sense, can often display mixed slow-fast response as in relaxation oscillations, and dependence on initial conditions of the fast variables. Also covered is the case where the quasi-static assumption in solid mechanics is violated. The computational tool is demonstrated to capture all of these behaviors in an accurate and robust manner, with significant savings in time. A practically useful strategy for initializing short bursts of microscopic runs for the accurate computation of the evolution of slow variables is also developed.

stefanogonella's picture

Postdoc position in mechanics of metamaterials at the University of Minnesota

A postdoc position in the area of mechanics of metamaterials is available in the group of Prof. Stefano Gonella (http://personal.cege.umn.edu/~gonella/) at the University of Minnesota. This exciting opportunity is in the context of a National Science Foundation (NSF)-funded interdisciplinary project whose main objective is to investigate the behavior of innovative topological metamaterials with asymmetric wave transport capabilities.

Ali Tamijani's picture

PhD position in Multiscale Structural Optimization at Embry-Riddle Aeronautical University

We are looking for a motivated PhD student in the area of structural optimization and additive manufacturing. Applicants with background in the area of solid mechanics/ computational mechanics/ structural optimization/ additive manufacturing will be preferred.

Please send your application (including CV and representative publications) to ali.tamijani@erau.edu

jkruzic's picture

PhD Scholarship Available, UNSW Sydney, High Entropy Alloys

This opportunity is for a PhD scholarship for up to two students commencing in 2018 which includes an annual stipend of AUD$ 40k tax free, a UNSW tuition fee scholarship for international students (~AUD$ 38k p.a.), and additional AUD$ 10k p.a. for career development and conference travel. The project duration is four years.
 

A PHD position available in University of North Texas

A Three-year PHD position is available immediately in the Department of Mechanical and Energy Engineering, University of North Texas-Denton in the fields of piezoelectric gas sensor.

Candidates should have a Bachelor/Master's degree in mechanical engineering, Solid Mechanics,  Electrical engineering or Chemical engineering with good academic standing and should have at least one of the experience in the following:

(1) Piezoelectric sensor device modelling and experiment

(2) MEMS device fabrication

(3) Gas sensor development

marco.paggi's picture

Open challenges in the phase field approach to fracture mechanics

Open challenges in the phase field approach to fracture mechanics

Minisymposium organized by Marco Paggi and José Reinoso at the World Congress in Computational Mechanics WCCM 2018 in New York, USA: http://www.wccm2018.org

 

2017 Stephen P. Timoshenko Medal - Professor Viggo Tvergaard

The Executive Committee of the ASME Applied Mechanics Division is pleased to announce and congratulate Professor Viggo Tvergaard, Professor Emeritus, Technical University of Denmark, as the recipient of the 2017 Timoshenko Medal.

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