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Journal Club for July 2020: Fatigue-resistant hydrogels: Principles, Experiments, and Applications

  

 

Fatigue-resistant hydrogels: Principles, Experiments, and Applications

Shaoting Lin, Xuanhe Zhao

1.     Introduction

iMechanica Video's picture

Introducing iMechanica Video

If a picture is worth of 1,000 words, a 1-min video is worth of 1.8 million words.  1,000 word/frame x 30 frame/s x 60 s. 

LOL, seriously? Maybe not. But a well made video does provide information in an effective and efficient way that is often times impossible via other media. 

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.
  • Replay videos of past EML Webinars on YouTube or Weibo.
Anjali2's picture

Elmer FEM-OpenFOAM-Dakota: An open-source framework for data analytics, finite element and finite volume methods

 

A program for 3 way coupling between open-source software Elmer FEM, OpenFOAM and Dakota has been developed.

The program along with examples can be found here: https://github.com/AnjaliSandip/ElmerFEM-OpenFOAM-Dakota

 

Capabilities: The interface provides an open-source framework that integrates data analytics, finite element and finite volume methods.

Fabrice Pierron's picture

Post-doc at the University of Southampton in experimental solid mechanics

We are looking for a post-doctoral researcher to work 18 months on a US Air Force sponsored project focused on developing new image-based tests to identify stiffness and strength of adhesives at high strain rates. Some preliminary results can be found here. The deadline for application is August 4th 2020.

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Novel porous materials by freeze casting

in recent years the technique of freeze casting has undergone tremendous development. New techniques and novel nanoscale building blocks have given rise to porous materials with extraordinary properties. As an example, by spinning freeze cast fibre with aligned pores fabrics with unprecedented levels of thermal insulation could be produced. This 

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Electrical contact resistance and its dependence on applied pressure

The relationships between surface roughness, contact pressure and contact resistance are studied in this work published three years ago.

It is imporant to distinguish between the different conduction mechanisms acting at contacts at different scales, in order to better understand how surface structure and surface chemistry can alter the behaviour of electrical contacts

USACM Virtual Seminar by Manuel Rausch, the University of Texas

The USACM is happy to announce a virtual seminar this week on Thursday, July 9th at 3pm Eastern.  The title of the seminar is "Image- and Experiment-based Modeling of the Forgotten Right Side: Right Ventricle, Tricuspid Valve, and Venous Blood Clot".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/Rausch_2020.07.09_2pm.pdf

We have a number of seats available to anyone interested.  We just ask attendees to register at this page:

Call for Abstracts: Symposium on Multifunctional Intelligent Materials and Systems in ASME IMECE 2020

Dear friends and colleagues,

We invite you to submit a presentation only abstract to Symposium on Multifunctional Intelligent Materials and Systems. This symposium is part of 2020 ASME International Mechanical Engineering Congress & Exposition, November 15-19, 2020 Oregon Convention Center, Portland, OR.

 

MehdiAmiri's picture

Special Issue "Thermodynamics of Materials Degradation"

Dear Colleagues,

The degradation of a structure, under various loading conditions, involves the progress of damage by initiation and growth of defects, such as microvoids and microcracks, and their coalescence into macrocracks. Thermodynamically, all damage mechanisms share a common feature at a much deeper level, which is dissipation of energy. Degradation processes are irreversible, meaning that they cause irreversible alteration to the system and the surroundings.

Bin Wang's picture

keep reading-2

Hydrogel ionotronics, Canhui Yang and Zhigang Suo, Nature Reviews Materials, 2018

 

Bin Wang's picture

keep reading-1

Design of robust superhydraphobic surfaces, Dehui Wang, Zuankai Wang, Robin H.A. Ras, Xu Deng, et al., Nature, 2020

Superhydrophobic surfaces have promising applications in various medical and engineering applications; however, these surfaces, either via physical and/or chemical methods, suffer from one major flaw- extremely vulnerable to mechanical damage, so lose superhydrophobicity easily in practice.

Bin Wang's picture

keep reading-5

Impact-resistant nacre-like transparent materials, Yin, Hannard, Barthelat, Science, 2019

 

Novelty/impact/significance:

Propose and fabricate nacre-inspired glass panels (50x50x3) that possess large-scale tablet sliding toughening mechanism, is 2-3 times more impact resistant than conventional laminated and tempered glass, and maintains transparency, high strength/stiffness.

Nuwan Dewapriya's picture

Molecular Dynamics Simulation of a Polymer-Metal Interface in LAMMPS

We are currently investigating the impact resistance of multilayers using molecular dynamics. This project showed us that modelling material interfaces could be challenging even for someone with a background in atomic simulations. Therefore, we thought of sharing some useful information and the LAMMPS input files to model the aluminum-polyurethane interface.

Can someone post an example of UMAT and VUMAT for the same elasto-plastic problem?

I want to understand how the stress update algorithm is modified for the different definitions of stress rate in ABAQUS/Standard and ABAQUS/Explicit formulations. I know the relationships, I just want to see how it's coded in a subroutine.

Also, the Hughes-Winget algorithm is used to update the stress defined by the Green-Naghdi stress rate by using the Jaumann rate. How to implement that in VUMAT? Can someone please post an example to clarify these aspects?

Fan Xu's picture

Thermal wrinkling of liquid crystal polymer shell/core spheres

Smart soft materials that can flexibly respond to external multi-physics stimuli, have shown intriguing applications in shape-morphing and morphology control. Here, we present tunable wrinkling patterns in core-shell spheres under thermal load via controlling the orientation of director in nematic liquid crystal polymer (LCP). To analyze nonlinear instability and morphological evolution of LCP shell/core spheres, we develop a shallow core-shell model that accounts for director-induced anisotropic spontaneous strains.

Amit Acharya's picture

Rotations with constant Curl are constant

Janusz Ginster        Amit Acharya

We address a problem that extends a fundamental classical result of
continuum mechanics from the time of its inception, as well as answers a fundamental
question in the recent, modern nonlinear elastic theory of dislocations.
Interestingly, the implication of our result in the latter case is qualitatively different
from its well-established analog in the linear elastic theory of dislocations.

Preprint

USACM Virtual Seminar by Pania Newell, University of Utah

The USACM is happy to announce a virtual seminar this week on Wednesday, July 1st at 3pm Eastern.  The title of the seminar is "Examining Fracture Behavior in Heterogeneous Poro-Elastic Media from Nano to Macro-Scale".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/Newell_2020.07.01_2pm.pdf

We have a number of seats available to anyone interested.  We just ask attendees to register at this page:

Ruobing Bai's picture

Elasticity notes of Eli Sternberg

Here are the elasticity notes of Eli Sternberg over many years as he taught AM 135 at Caltech. I had access to them when I was working with Prof. Kaushik Bhattacharya at Caltech during postdoc. Prof. Bhattacharya suggested making the notes publicly available via iMechanica, and below is a short note from him.

 

Mayank Patni's picture

Variable kinematics continuum finite element

Willing to share the work done in my Ph.D. thesis ("An efficient numerical framework for capturing localised 3D stress fields in laminated composites). The basic code (written in FORTRAN 90) is available on GITHUB (Check the following link). 

Mechanical Engineering HQ's picture

World’s First Spherical Artificial Eye Has 3D Retina

Hello iMechanica! My name is Ryan and I am the Founder of Mechanical Engineering HQ. I am writing here today to share an interesting development in prosthesis. Scientists have claimed that they have developed a new artificial eye that has more advanced capabilities than human eyes. Read on to see if they have achieved this feat!

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