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Intrinsic stress mitigation via elastic softening during two-step electrochemical lithiation of amorphous silicon

Submitted by Zheng Jia on

Zheng Jia, Teng Li, Intrinsic stress mitigation via elastic softening during two-step electrochemical lithiation of amorphous silicon, Journal of the Mechanics and Physics of Solids, 91, 278–290, (2016) (DOI:10.1016/j.jmps.2016.03.014)

 

 

Harnessing atomistic simulations to predict the rate at which dislocations overcome obstacles

Submitted by sepehr.saroukhani on

Predicting the rate at which dislocations overcome obstacles is key to understanding the microscopic features that govern the plastic flow of modern alloys. In this spirit, the current manuscript examines the rate at which an edge dislocation overcomes an obstacle in aluminum. Predictions were made using different popular variants of Harmonic Transition State Theory (HTST) and compared to those of direct Molecular Dynamics (MD) simulations. The HTST predictions were found to be grossly inaccurate due to the large entropy barrier associated with the dislocation–obstacle interaction.

Continuous and discrete microstructured materials with null Poisson's ratio

Submitted by Giorgio Carta on

In this paper we propose diff erent classes of isotropic microstructured media with tunable Poisson's ratio. The elastic periodic systems are continuous porous media and two- and three-dimensional lattices. The microstructural parameters can be tuned in order to have an eff ective Poisson's ratio equal to zero. The connection between microstructural parameters and eff ective properties is shown in detail both analytically and numerically.

 

Continuous system with null Poisson's ratio:

Design of a porous material with isotropic negative Poisson's ratio

Submitted by Giorgio Carta on

This paper proposes the design of a two-dimensional porous solid with omnidirectional negative Poisson's ratio. The hexagonal periodic distribution of the pores makes the e ffective behavior isotropic. Both experimental tests and numerical simulations have been performed to determine the e ffective properties of the porous solid. A parametric study on the e ffect of the geometrical microstructural parameters is also presented. This auxetic structure is easy to fabricate and can be very useful in several engineering applications.

 

2016 Melosh Medal Winner and Finalists

Submitted by Guglielmo_Scovazzi on

The 2016 winner of the Robert J. Melosh Medal is Maruti Kumar Munuduru, with the paper “Structure-Preserving Finite Element Formulations for Advective-Diffusive-Reactive Systems.” Maruti earned a Ph.D. Degree from the University of Houston, and is currently a post-doctoral appointee at Los Alamos National Laboratory.

 

The other five finalists in the competition were (in alphabetical order):

Journal Club Theme of May 2016: Recent Progress in Curvilinear Electronics and Mechanics

Submitted by Jianliang Xiao on

Recent Progress in Curvilinear Electronics and Mechanics

Jianliang Xiao

Department of Mechanical Engineering, University of Colorado Boulder

1. Introduction

Quantifying dislocation microstructure evolution and cyclic hardening in fatigued face-centered cubic single crystals

Submitted by ahmed.hussein on

Discrete dislocation dynamics simulations were performed to investigate the dislocation microstructure evolution and cyclic hardening during the early stages of fatigue loading in nickel single crystals. The effects of the crystal size and initial dislocation densities on both the mechanical response and the evolution of dislocation microstructure were quantified. Crystals having an initial dislocation density of 1012  m−2 and diameter less than  do not show any dislocation density multiplication or cyclic hardening.

Simpleware workshop at ETH Zurich, May 11 2016

Submitted by Simpleware on

Introduction and Live Demo: 3D Image Visualisation, Analysis and Model Generation with Simpleware

Date: Wednesday, May 11, 2016

Time: 9:00 am - 12:00 pm

Location: Swiss Federal Institute of Technology Zurich (ETH), Building ETZ, Gloriastrasse 35, Zurich, Switzerland

Who should attend