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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. 

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.
  • Replay videos of past EML Webinars on YouTube or Weibo.

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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?

pastewka's picture

PhD or Postdoc: Depinning of dislocations in random media

The Department of Microsystems Engineering and the Department of Applied Mathematics at the University of Freiburg are calling for applications for

Two doctoral or postdoctoral researcher positions

How to include temperature effects on the shear rates in Dr. Huang's crystal plasticity code

I am using Dr. Huang's crystal plasticity code for an adiabatic process where temperature increase due to deformation need to be calculated. Dr. Huang's CP UMAT code does not consider the temperature effect of shear rate or hardening. Is there a way to include temperature effects in the current UMAT code?

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.


Post-doc positions available in SUSTech (Shenzhen, China)

Multiple Post-doctoral researcher positions with competitive salary are available in Dr.

Philipp Rothemund's picture

Dynamics of Electrohydraulic Soft Actuators

We have discovered two timescales that govern the dynamic behavior of electrohydraulic actuators: a viscous timescale and an inertial timescale, which depend on geometry and materials system of the actuator, and applied mechanical load and voltage. Depending on the ratio of these timescales, the actuators operate either in a viscous regime in which viscous resistance limits the actuation speed or in an inertial regime in which high speed actuation is possible.

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:

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.


Bin Wang's picture

keep reading-4

Layered nanocomposites by shear-flow-induced alignment of nanosheets, Chuangqi Zhao, Lei Jiang, Mingjie Liu, Nature, 2020


Good papers clearly state their novelty/significance, scientific question, and key of how in the abstract, and the writing is clear and coherent, despite the depth and complexity of the work.



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!

Qizhi He's picture

Post-doctoral Fellow in multiscale topology optimization and additive manufacturing of lattice structures at at HKU

Applications are invited for appointment as Post-doctoral Fellow in multiscale topology optimization and additive manufacturing of lattice structures in the Department of Orthopaedics and Traumatology (Ref.: 500412), to commence as soon as possible for one to three year(s), with the possibility of renewal subject to satisfactory performance. A highly competitive salary (above HK$30,000 per month, low tax rate) commensurate with qualifications and experience will be offered, in addition to annual leave and medical benefits.  

PhD/postdoc vacancy (4 years) on development of topology optimization algorithms for functionally graded materials

Wire Arc Additive Manufacturing or WAAM techniques are attracting interest from the manufacturing industry because of their potential to produce large metal components with low cost and short production lead time. This process exists alongside other high deposition rate metal AM technologies such as powder and wire based DED. While these use either laser or an electron beam as energy source to melt a metal powder or wire, WAAM technologies melt metal wire using an electric arc.

Teng Li's picture

EML Webinar by Prof. Chiara Daraio on July 1, 2020: The Mechanics of Robotic Matter

EML Webinar on July 1, 2020 will be given by Prof. Chiara Daraio at Caltech via Zoom meeting. Discussion leader: Teng Li, University of Maryland.


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