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Magneto-elastic composite

Dear all,

May I bring your attention to recent papers of our that deals with fibre-reinforced magneto elastic composite at large strain?

https://arxiv.org/pdf/1811.11536

https://authors.elsevier.com/a/1ZVv44jvR22kv

I think the content would be of much interest for the community.

marc53042's picture

Postdoctoral Research Opportunities at EPUSP

The Fracture Mechanics and Structural Integrity Research Laboratory (NAMEF) of the Polytechnic School of Engineering at the University of São Paulo (EPUSP) has openings for 2-year postdoctoral fellows (which may be extended to an additional year depending on funding availability) with a strong background in fracture mechanics, fatigue and computational modeling of materials starting from August/2019 or September/2019. Interested applicants can see details in the attached document.

marc53042's picture

PhD Research Opportunities at EPUSP

The Fracture Mechanics and Structural Integrity Research Laboratory (NAMEF) of the Polytechnic School of Engineering at the University of São Paulo (EPUSP) has openings for 3-year PhD positions (which may be extended to an additional year) to conduct research in the areas of fracture mechanics, fatigue and computational modeling of materials starting from August/2019 or September/2019.

Shengyou Yang's picture

Flexoelectricity as a universal mechanism for energy harvesting from crumpling of thin sheets

Can the mere crumpling of a paper produce electricity? An inhomogeneous strain can induce electrical response in all dielectrics and not just piezoelectric materials. This phenomenon of flexoelectricity is rather modest unless unusually large strain gradients are present. In this paper, we analyze the crumpling of thin elastic sheets and establish scaling laws for their electromechanical behavior to prove that an extremely strong flexoelectric response is achieved at submicron length scales.

marco.paggi's picture

New book on Modeling and Simulation of Tribological Problems in Technology, CISM series, Springer

The new book "Modeling and Simulation of Tribological Problems in Technology" (CISM book series, Springer) has been published: https://link.springer.com/book/10.1007/978-3-030-20377-1

Editors: Paggi, Marco (IMT School for Advanced Studies Lucca, Italy), Hills, David (University of Oxford)

Main contributing authors, lecturers of the CISM course http://www.cism.it/courses/C1805/: D.A. Hills, J.R. Barber, M. Paggi, D. Dini, A. Almqvist 

Antonio Papangelo's picture

Axisymmetric JKR-type adhesive contact under equibiaxial stretching

 Our research has just been published in Journal of Adhesion. It deals with axisymmetric frictionless adhesive contact problem for a spherical indenter pressed against an isotropic elastic incompressible half-space under equibiaxial stretching is studied in the framework of the generalized Johnson{Kendall{Roberts (JKR) theory, which accounts for the effect of weak coupling between fracture modes I and II by means of a phenomenological mode-mixity function. The model predicts that contact area can withstand a larger level of the substrate stretch under moderate pre-pulling force.

Mike Ciavarella's picture

On the application of fracture mechanics mixed-mode models of sliding with friction and adhesion --- the Menga, Carbone & Dini paradox

I attach a PREPRINT of a paper on the Menga, Carbone & Dini paradox (published in JMPS last year, available at https://arxiv.org/pdf/1710.06506.pdf), that is on the application of thermodynamics to mixed mode fracture mechanics models of contacts with friction and adhesion, and an apparent paradox which emerges from this treatment.  Comments welcome.   

swcranford's picture

Doing interesting, innovative materials work? Make your next submission Matter!

Hi all, 

Just wanted to share that the first issue of Matter was released last week. Matter is a new materials science journal from Cell Press. Our goal is to be a high impact offering, on par with Nature Materials. Check out our first issue here:

https://www.cell.com/matter/issue?pii=S2590-2385(19)X0002-8

Mike Ciavarella's picture

A comment on "A dimensionless measure for adhesion and effects of the range of adhesion in contacts of nominally flat surfaces" by M. H. Muser

I attach a Letter I sent to the Editor of a tribology journal, concerning adhesion of rough surfaces. 

I contend that some "criteria" that have been proposed based on extrapolation of numerical results are due to the limitations in present numerical sophisticated rough contact simulations, which only span at most 3 orders of magnitude of wavelengths, so typically people simulate from nanometer to micrometer scale.

MNasr's picture

Size-dependent mechanical behaviour of nanowires: an overview

A recent study reviews achievements made in the determination of the size‐dependent mechanical properties of nanowires. Covering both measurement techniques and computational approaches, data reported in the literature are summarized for a variety of nanowires.

Hangbo Zhao's picture

Buckling and twisting of advanced materials into morphable 3D mesostructures

In this work, we present concepts that allow controlled introduction of buckling and twisting deformations to the mechanically guided assembly of 3D mesostructures.

Winners & Finalists of the 31th Edition of the Annual Robert J. Melosh Competition at Duke University

The winner of the 2019 Robert J. Melosh Medal is Dewen Yushu (University of Notre Dame), who presented the paper "The data-driven multiscale multigrid solver, preconditioner and reduced-order model."

Congratulations also to the other finalists! They are listed below, with their respective papers:

Siddhant Kumar, California Institute of Technology and ETH Zurich "Enhanced local maximum-entropy approximation for stable meshfree simulations;"

chenna's picture

Unified finite element formulation for computational solid mechanics

Dear iMechanica members,

I have recently proposed a novel finite element framework for computational solid mechanics. I hope you find it interesting. I appreciate any feedback.

 

SwarnavaGhosh's picture

Electronic structure study regarding the influence of macroscopic deformations on the vacancy formation energy in aluminum

Dear Colleagues,

Here is our recently published article about the influence of macroscopic deformations on vacancies in Aluminum. 

Title: Electronic structure study regarding the influence of macroscopic deformations on the vacancy formation energy in aluminum

 Authors: Swarnava Ghosh, Phanish Suryanarayana*

Highlights

Zheng Jia's picture

A micromechanical model for the growth of collagenous tissues under mechanics-mediated collagen deposition and degradation

In this study, we developed a micromechanical model for the growth and remodeling of a soft tissue based on the concurrent action of collagen deposition and degradation. We assumed in the model that collagen degradation causes a reduction in the fiber radius, while collagen deposition can increase both the radius and length of the collagen fibers growing under load. The latter arises from the assumption that collagen is deposited in an unstressed state, which increases the reference length of a fiber growing under mechanical load.

Zheng Jia's picture

Bifurcation instability of substrate-supported metal films under biaxial in-plane tension

The stretchability of metal materials is often limited by the onset and development of necking instability. For instance, necking of lithium metal often occurs at low strains and thus hinders its practical applications in stretchable lithium batteries. Substrate/metal bilayers are emerging as a promising solution to the stringent stretchability requirement of metal electrodes and current collectors in flexible and stretchable batteries.

Fan Xu's picture

Laser manipulated wrinkling patterns

Smart soft materials, because of their mechanical flexibility and quick response to multi-physics stimuli, have drawn considerable attention over the past few years. Here, we present controllable wrinkling patterns of a liquid crystal polymer film attached on a soft substrate, controlled by laser illumination that holds unique optical characteristics of high coherence and irradiance.

Refat_Islam's picture

Random fiber networks with inclusions: The mechanism of reinforcement

The mechanical behavior of athermal random fiber networks embedding particulate inclusions is studied in this work. Composites in which the filler size is comparable with the mean segment length of the network are considered. Inclusions are randomly distributed in the network at various volume fractions, and cases in which fibers are rigidly bonded to fillers and in which no such bonding is imposed are studied separately.

Amit Acharya's picture

Continuum mechanics of moving defects in growing bodies

Amit Acharya          Shankar Venkataramani

 

Growth processes in many living organisms create thin, soft materials with an intrinsically hyperbolic
geometry. These objects support novel types of mesoscopic defects - discontinuity lines
for the second derivative and branch points - terminating defects for these line discontinuities.
These higher-order defects move "easily", and thus confer a great degree of
flexibility to thin hyperbolic elastic sheets. We develop a general, higher-order, continuum mechanical framework
from which we can derive the dynamics of higher order defects in a thermodynamically consistent
manner. We illustrate our framework by obtaining the explicit equations for the dynamics
of branch points in an elastic body.

 

https://www.researchgate.net/publication/333877242_Continuum_mechanics_of_moving_defects_in_growing_bodies

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