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Jingjie Yeo's picture

Journal Club for September 2020: The Biofilm Matrix - A Living Engineering Material

The Biofilm Matrix - A Living Engineering Material

Chenxi Zhai, Haoyuan Shi, Tianjiao Li, Liming Zhao, Jingjie Yeo

J2 Lab for Engineering Living Materials, Sibley School of Mechanical and Aerospace Engineering, Cornell University

Introduction

lijianyu's picture

Journal Club for June 2020: Mechanically instructive biomaterials: a synergy of mechanics, materials and biology

 

Mechanically instructive biomaterials: a synergy of mechanics, materials and biology

Zhenwei Ma, Jianyu Li

Department of Mechanical Engineering, McGill University, Montreal, Canada

 

Teng Li's picture

EML Webinar

  • Mark your calendar: every Wednesday at 10 am Boston, 3 pm London, 10 pm Beijing.
  • Join live webinars in two ways: Zoom (for attending the lecture and participating in the discussion) or YouTube Live Stream.
  • Watch videos of past EML Webinars on YouTube or Weibo.
Wenbin Yu's picture

Global Composites Experts Webinar by Ken L Reifsnider

Title: Direct coupling predicting the strength and life of fiberous composite laminates

Speaker: Dr. Ken L Reifsnider

Time: 10/8, 11AM-12PM EST.

Please go to https://www.purdue.edu/cmsc/events/2020-webinars/ to register for this talk.

mohsenzaeem's picture

A new planner BCN lateral heterostructure with outstanding strength and defect-mediated superior semiconducting to conducting properties

Motivated by the recent synthesis of boron-carbon-nitride (BCN) monolayers with different atomic compositions, we propose a novel planar BCN lateral heterostructure with a combination of graphene and hexagonal boron nitride (h-BN) counterparts. Density functional theory (DFT) and classical molecular dynamics (CMD) simulations are integrated to examine the effects of defects (vacancy and Stone-Wales (SW) defects) and temperature on the physical properties of the BCN heterostructure.

mshakiba's picture

Post-doctoral research associate and Graduate student openings

A postdoctoral and graduate student openings with the main focus on the mechanics of composites materials are available immediately in Shakiba's group. We are looking for strongly motivated candidates to work on an AFOSR supported project on 1) thermo-mechanical damage coupling in FRPs, 2) simulation of additively manufactured composites and 3) sensitivity and machine learning for damage predictions.

Fan Xu's picture

Effect of surface topography on anisotropic friction of graphene layers

Tribological behavior of graphene layers has been a focus of intensive research interest since its crystal lattice structure can be exploited to achieve incommensurate contact, leading to nearly zero friction, namely structural superlubricity. However, wrinkling undulations are omnipresent on graphene and difficult to be completely eliminated, which inevitably resists superlubricity in reality. Here, we explore how the presence of surface wrinkles affects nanotribological behavior of graphene sliding systems.

Arash_Yavari's picture

The Anelastic Ericksen Problem: Universal Deformations and Universal Eigenstrains in Incompressible Nonlinear Anelasticity

Ericksen's problem consists of determining all equilibrium deformations that can be sustained solely by the application of boundary tractions for an arbitrary incompressible isotropic hyperelastic material whose stress-free configuration is geometrically flat. We generalize this by first, using a geometric formulation of this problem to show that all the known universal solutions are symmetric with respect to Lie subgroups of the special Euclidean group. Second, we extend this problem to its anelastic version, where the stress-free configuration of the body is a Riemannian manifold.

giorgio_carta's picture

Special Issue "Advances in Elastic Micro-Structured Systems and Metamaterials"

 

The Special Issue "Advances in Elastic Micro-Structured Systems and Metamaterials", that will be published in Applied Sciences (Impact Factor: 2.474), is open to receive submissions for peer-review and possible publication.

 

The aims and scope can be found at the following link:

Fan Xu's picture

Intricate evolutions of multiple-period post-buckling patterns in bilayers

Surface instability of compliant film/substrate bilayers has raised considerable interests due to its broad applications such as wrinkle-driven surface renewal and antifouling, shape-morphing for camouflaging skins, and micro/nano-scale surface patterning control. However, it is still a challenge to precisely predict and continuously trace secondary bifurcation transitions in the nonlinear post-buckling region. Here, we develop lattice models to precisely capture the nonlinear morphology evolution with multiple mode transitions that occur in the film/substrate systems.

Arash_Yavari's picture

Transformation Cloaking in Elastic Plates

In this paper we formulate the problem of elastodynamic transformation cloaking for Kirchhoff-Love plates and elastic plates with both in-plane and out-of-plane displacements. A cloaking transformation maps the boundary-value problem of an isotropic and homogeneous elastic plate (virtual problem) to that of an anisotropic and inhomogeneous elastic plate with a hole surrounded by a cloak that is to be designed (physical problem). For Kirchhoff-Love plates, the governing equation of the virtual plate is transformed to that of the physical plate up to an unknown scalar field.

Wenbin Yu's picture

Global Composites Experts Webinar by Ramesh Talreja

Title: A manufacturing sensitive design strategy for composite materials using physical modeling and stochastic simulation of defectsSpeaker: Dr. Ramesh TalrejaTime: 9/24, 11-12.

Please go to https://www.purdue.edu/cmsc/events/2020-webinars/ to register for this exciting webinar.

Emilio Martínez Pañeda's picture

Analysis of the influence of microstructural traps on hydrogen assisted fatigue

Dear iMechanicians,

I hope some of you find of interest our latest Acta Mat. paper. We show that the concept of "beneficial traps" can enlarge by an order of magnitude the range of "safe loading frequencies" at which hydrogen embrittlement is not observed. 

Analysis of the influence of microstructural traps on hydrogen assisted fatigue

Rebeca Fernández-Sousa, Covadonga Betegón, Emilio Martínez-Pañeda

Acta Materialia 199, 253-265 (2020). Link

Prashant K. Jha's picture

Kinetic relations and local energy balance for LEFM from a nonlocal peridynamic model

Journal: International Journal of Fracture

Abstract: A simple nonlocal field theory of peridynamic type is applied to model brittle fracture. The kinetic relation for the crack tip velocity given by Linear Elastic Fracture Mechanics (LEFM) is recovered directly from the nonlocal dynamics, this is seen both theoretically and in simulations. An explicit formula for the change of internal energy inside a neighborhood enclosing the crack tip is found for the nonlocal model and applied to LEFM.

 

Antonio Papangelo's picture

Roughness-Induced Adhesion

Usually, roughness destroys adhesion and this is one of the reasons why the "adhesion paradox", i.e. a "sticky Universe", is not real. However, at least with some special type of roughness, there is even the case of adhesion enhancement, as it was shown clearly by Guduru, who considered the contact between a sphere and a wavy axisymmetric single scale roughness, in the limit of short-range adhesion (JKR limit).

Emilio Martínez Pañeda's picture

Fracture in distortion gradient plasticity

Dear iMechanicians,

I hope that the following paper is of interest to you. We use for the first time Gurtin (2004) gradient plasticity theory to investigate crack tip mechanics, revealing the existence of an elastic core adjacent to the crack tip, resembling a dislocation-free zone. Also, we show that the combination of strain gradient hardening and dislocation blockage can rationalise brittle fracture in elastic-plastic material interfaces.

Tapered elasticæ as a route for axisymmetric morphing structures

Dear Colleagues,

I'd like to share our recent paper on the design framework of morphing structures published in Soft Matter. It is open access, and you can download it via: https://pubs.rsc.org/en/content/articlehtml/2020/sm/d0sm00714e

Tapered elasticæ as a route for axisymmetric morphing structures

Mingchao Liu, Lucie Domino and Dominic Vella (Mathematical Institute, University of Oxford)

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