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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

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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.
Teng Li's picture

EML Webinar by Basile Audoly / Eitan Grinspun / Pedro M. Reis on collaborative adventures on the geometrically nonlinear mechanics of elastic rods

EML Webinar on July 15, 2020 will be given by Professors Basile Audoly (École Polytechnique) / Eitan Grinspun (University of Toronto) / Pedro M. Reis (EPFL) via Zoom meeting. Discussion leader: Professor John Maddocks, EPFL

USACM Virtual Seminar by Kai James, the University of Illinois at Urbana-Champaign

The USACM is happy to announce a virtual seminar this week by Professor Kai James on Thursday, July 16th at 2pm Eastern.  The title of the seminar is "Topology Optimization of Self-Actuating Shape-Memory Polymer Mechanisms".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/James_2020.07.16_1pm.pdf

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

Julian J. Rimoli's picture

MicroStructPy: Generation of statistically representative microstructures with direct grain geometry control

I would like to share an article that was recently published in CMAME.

It is about MicroStructPy, a very flexible microstructure generator able to represent various statistics for microstructures with multiple phases. It works in 2D and 3D and you can provide, for each phase, grain size distributions, volume fraction, elongation and orientation distribution for elongated grains, etc.

donghai's picture

A residual stiffness-based model for the fatigue damage of biological soft tissues

Biologically-derived and chemically-treated collagenous tissues such as glutaraldehyde-treated bovine pericardium (GLBP) are widely used in many medical applications. The long-term cyclic loading-induced tissue fatigue damage has been identified as one of the primary factors limiting the durability of such medical devices and an in-depth understanding of the fatigue behaviors of biological tissues is critical to increase device durability.

oliver oreilly's picture

Models for peristaltic locomotion in soft robots and worms

Dear Colleague,

I'm pleased to announce the latest paper from my research group (coauthored with Evan Hemingway (PhD 2020)): 

Continuous models for peristaltic locomotion with application to worms and soft robots

has just been published in Biomechanics and Modeling in Mechanobiology. Here's a simulation of the model:

@UCBDynamicsLab

How to do nanoindentation simulation of a coating material?

How to conduct nanoindentation simulation of a coating material (Substrate Ti material and Tantalum pentoxide (Ta2O5) as a coating material) by FEA software? What are the input parameters I need to consider for the simulation?

Teng Li's picture

关注李腾教授视频号,每天学会一个让你的科研腾飞的诀窍!一个开通6天总播放量就超过21万次的视频号!

我在2020年7月5日开通了微信视频号,每天会发布一条新视频,和你分享一个让你的科研腾飞的诀窍!

今天是视频号开通的第6天,我发布了7条视频,总播放数超过了21万次。

微信扫描下面的二维码,欢迎关注,转发,点赞,评论!

如果你打不开我的视频号,请尝试更新你的微信到最新版本。如果更新后仍然打不开视频,或是不能关注,说明你的微信账号尚未开通视频号功能。敬请耐心等待,微信视频号目前正在逐步向用户开放。但你仍然可以通过扫描上面的二维码,看到我发布的所有视频。

有问题,请留言。谢谢!

Kai Yu's picture

Call for abstracts: Topic on 3D Printed Soft Materials in ASME IMECE 2020

Dear colleagues: 

We would like to invite you to submit an abstract to the Topic 12-3: 3D Printed Soft Materials at the 2020 ASME  IMECE to be held from November 15 – 19 at Portland, Oregon.

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?

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