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MMSLab-CNR's picture

Call for Abstract - Frontiers in Built Environment, Earthquake Engineering

Dear colleagues, Given the recent establishment of the so-called Urban Seismology field and the lack of dedicated journals for the topic, together with Professor Maria Todorovska (University of Southern California, USA), Dr. Riccardo Maria Azzara (INGV, Italy), Dr. Michele Palermo and Dr. Simonetta Baraccani (University of BOlogna, Italy), we would like to establish a network of researchers dealing with this very challenging topic.

MMSLab-CNR's picture

Modal analysis performed by NOSA-ITACA code

The following picture shows a screenshot of the NOSA-ITACA desktop enviroment during a modal analysis. In particular the first and the third mode shape of the San Frediano bell Tower in Lucca (Italy) are shown. The structure is discretized into 45641 eight-node brick elements (element no. 8, NOSA-ITACA element library) with 136923 degrees of freedom. For more details sees: R.M. Azzara, G. De Roeck, E. Reynders, M. Girardi, C. Padovani and D.

Ruobing Bai's picture

Journal Club for March 2019: Fatigue of hydrogels

Fatigue of hydrogels

Ruobing Bai (1,2), Zhigang Suo (1)

(1) John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University

(2) Department of Mechanical and Civil Engineering, California Institute of Technology

 

Bin Liu's picture

Criteria for selecting a reasonable and better measure of anisotropy

Published in Physcal Review Letters: https://doi.org/10.1103/PhysRevLett.122.045502. Many materials are anisotropic. However, there is no widely accepted measure for characterizing the degree of elastic anisotropy. Here, assuming that the limiting case of extreme anisotropy should possess a positive semidefinite stiffness matrix, we propose three criteria to evaluate measures of anisotropy and show that the existing measures in the literature do not satisfy all of the proposed criteria.

Jingjie Yeo's picture

Multiscale Design of Graphyne‐Based Materials for High‐Performance Separation Membranes

https://doi.org/10.1002/adma.201805665 Computational modeling and simulations play an integral role in the bottom‐up design and characterization of graph‐n‐yne materials. Here, the state of the art in modeling α‐, β‐, γ‐, δ‐, and 6,6,12‐graphyne nanosheets for synthesizing graph‐2‐yne materials and 3D architectures thereof is discussed.

Jingjie Yeo's picture

Paraffin-enabled graphene transfer

https://doi.org/10.1038/s41467-019-08813-x We report a transfer approach using paraffin as a support layer, whose thermal properties, low chemical reactivity and non-covalent affinity to graphene enable transfer of wrinkle-reduced and clean large-area graphene.

marc53042's picture

Postdoctoral Research Fellow Position at the University of São Paulo, Brazil.

We are looking for a candidate with a Ph.D. degree to study fracture problems in bimetallic pipelines,  API X65 internally clad with alloy 625. The project has direct application to offshore exploration in Brazil deepwater fields. The project is going to be funded by the Petrobras company. The chosen candidate will develop a parametric model to model the welded joint of this type of pipes using python/Abaqus, being the numerical model as close as possible to the real geometry.

Bent F. Sørensen's picture

Micromechanical model for prediction of fatigue limit of fibre composites

We have published a paper called "Micromechanical model for prediction of the fatigue limit for unidirectional fibre composites" in Mechanics of Materials. See the link here.

Emilio Martínez Pañeda's picture

The role of plastic strain gradients in the crack growth resistance of metals [code included]

I hope some of you will find our recent paper in the Journal of the Mechanics and Physics of Solids interesting. The Abaqus user element (UEL) subroutine developed to implement strain gradient plasticity theories with energetic and dissipative higher order stresses (Gudmundson 2004, Fleck and Willis 2009) can be downloaded from www.empaneda.com/codes

The role of plastic strain gradients in the crack growth resistance of metals

Emilio Martínez-Pañeda, Vikram S. Deshpande, Christian F. Niordson, Norman A. Fleck

Two Doctoral Student Positions in Ice Mechanics

Aalto University School of Engineering in Finland invites application for 

TWO DOCTORAL STUDENT POSITIONS IN ICE MECHANICS

The positions are in the research group of Marine and Arctic Technology.

PhD positions at George Mason University, ME Department (Controls in brain-computer interface & healthcare)

Applications are invited for PhD positions at the Algorithms in Medicine and Neuro-Technology Lab (AIMAN Lab) in the Department of Mechanical Engineering at George Mason University, Fairfax, VA.

Research
The AIMAN Lab pursues fundamental breakthroughs in biomedical cyber-physical systems. The lab’s primary research focuses on application of mathematical modeling, controls and estimation theory, and machine learning in health information technology including decision support and automated care systems, with the intention of improving the quality of healthcare, as well as brain-computer interfaces to bring neuro-enhancements to the daily consumer.

Application
Interested researchers with passion in digital healthcare and neuroscience are encouraged to send their CV to Dr. Ramin Bighamian at rbighami@gmu.edu.

Qualification
Experience in controls engineering, estimation theory, machine learning, MATLAB
A Master's degree in mechanical engineering, electrical engineering, or other related disciplines.

Solving incompressible finite elasticity without tears

Solving incompressible elasticity has been quite challenging numerically. The conventional approach for handling incompressibility is the so-called penalty method. A volumetric energy term enters into the strain energy and penalizes the volumetric deformation. One straightforward issue is that the penalty parameter goes directly into the tangent matrix. The bigger the penalty parameter, the worse the condition number of the matrix. This is really a manifestation of the ill-posedness of theories based on the Helmholtz free energy, in my opinion [3].

ludovicnoels's picture

PhD or Post Doc position in “Multi-scale Multi-Physics simulations of Shape Memory Composites”

Context
As part of a collaborative project between different faculties of the University of Liege (Belgium), there is an open position to develop and validate numerical models for shape memory composite.

PhD or Post Doc opportunity
The project will be supervised by Prof. L. Noels of ULg (http://www.ltas-cm3.ulg.ac.be/). The position is that of either a PhD student or a Post-Doc for renewable periods of 12 months starting immediately.

Ruobing Bai's picture

Tearing a hydrogel of complex rheology

Dear colleagues,

I would like to share with you our latest paper focusing on the fracture of hydrogels of complex rheology.

 

Title: Tearing a hydrogel of complex rheology

Authors: Ruobing Bai, Baohong Chen, Jiawei Yang, Zhigang Suo*

Abstract:

Mike Ciavarella's picture

review paper: The role of adhesion in contact mechanics

Journal of The Royal Society Interface 16(151), February 2019.    DOI: 10.1098/rsif.2018.0738

Michele Ciavarella Junki Joe Junki Joe Antonio Papangelo James Richard Barber

Antonio Papangelo's picture

The role of adhesion in contact mechanics

Just published in Journal of the Royal Society Interface

Ciavarella M, Joe J, Papangelo A, Barber JR. 2019 The role of adhesion in contact mechanics. J. R. Soc. Interface 16: 20180738. http://dx.doi.org/10.1098/rsif.2018.0738

Abstract

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