User login

You are here


Subscribe to Comments feed
Updated: 31 min 31 sec ago

Dear Omkar,

Sat, 2018-01-20 01:13

In reply to Constitutive model of LCEs

Dear Omkar,

Thanks for sharing your paper. It's very interesting. 

I think you are abosolutely right about the stress tensors and rotation of mesogens. Then the boundary condition absent of inner couple becomes non-physical. I don't really know the answer to your question. I think you can decouple the total deformation gradient to elastic part and the part due to mesogen rotation, although these two are highly coupled. 

if you are in Paris this will be a seminar on Mardi 6 Février

Fri, 2018-01-19 12:29

In reply to Some open problems in adhesion (of rough surfaces).

Séminaire du Laboratoire de Sciences et Ingénierie  de la Matière Molle (SIMM)

Mardi 6 Février 2018 - 14h00 - Amphi Urbain

La liste des séminaires du laboratoire peut être consultée sur le lien :


open access is now prescribed in Switzerland, UK, Austria, etc

Fri, 2018-01-19 12:26

In reply to Nobel laureate Randy Schekman: How journals like Nature, Cell and Science are damaging science

Based on a decision by the National Research Council, all publications produced in SNSF-funded projects are to be freely available in digital format as of 2020. This follows other countries, see Svizzera, Olanda Gran Bretagna (qui, e qui) l’Austria,  Germania, Svezia, Francia, Danimarca, Belgio  

Origin of stress plateau

Fri, 2018-01-19 12:24

In reply to Journal club for January 2018: Recent advances in liquid crystal elastomer

Hello Professor Cai,

Thank you for your excellent review on LCE mechanics. I have a question-

You mentioned that the stress plateau corresponds to polydomain-to-monodomain transition (random to chain alignment) of LCE. However, in elastic network literature,  alignment is typically associated with network stiffening whereas stress plateau indicates instability or locking of structure (for example, polymeric foam under compression). It is very interesting that the plateau persists at such large stretch without any stiffening. Do you think this is more material specific effect rather than geometric effect?




The position has been filled

Fri, 2018-01-19 11:51

In reply to Postdoctoral researcher position: Multiscale modeling of carbon fiber fabrication and properties

The position has been filled. Thanks to everyone who applied.

Constitutive model of LCEs

Fri, 2018-01-19 07:29

In reply to 3D constitutive model

Dear Shengqiang,

Thank you for starting this discussion thread here and many congratulations on your achievements.

Also thank you Lihua for providing your insights here. We are dealing with similar constitutive modeling techniques in Stuttgart and we recently published our preliminary results in following paper

I have a question regarding the model presented in your publication. The equation (14) is the expression for Cauchy stress tensor and normally it is unsymmetric due to the considered neo-classical energy. In absence of inner couples however, it is symmetric in nature. In my understanding, uniaxial tension test (perpendicular to the direction of nematic director) induces rotation of mesogens which in turn applies some torque or inner couple on the body. My question now is, how can one ensure the absence of inner couples in classic boundary value problems e.g. uniaxial tension test? Is considering LCEs as a micropolar material an option, as suggested by hgaksoy?

Thank you in advance.

Best regards,

Omkar Nadgir


Dear Prof. Cao,

Wed, 2018-01-17 11:42

In reply to Faculty Position in Packaging Innovation, Design and Additive Manufacturing

Dear Prof. Cao,

I am currently a Postdoctoral Researcher at Johns Hopkins University. My Ph.D. and Postdoc researches are in computational mechanics, design optimization, and additive manufacturig of energy storage and thermo-fluidic systems with Kurt Maute (PhD advisor) and James K. Guest (Postdoc advisor). However, I don't have experiences about packaged products (i.e. experimentally). I was wondering if I can apply for this position. I highly appreciate it if you give me more information.




Tue, 2018-01-16 14:51

In reply to Open positions at UNFoLD in 2018 at EPFL (Switzerland)

Kindly tag the post under Job to get maximum readers.



however, I must warn you that I am skeptical about this

Mon, 2018-01-15 15:34

In reply to Nobel laureate Randy Schekman: How journals like Nature, Cell and Science are damaging science

These claims are of course very strong and call for some skepticism.

Indeed, these in turn scientific papers not published in proper journals with scientific peer review, and may well be false.

I am not sure if this CV of Julia Belluz is truthful, because if it is, she has graduated from top schools and has obtained top prizes working in top journals.

However, her attachments to antivaccine movements, and other weird and non-scientific things, make me very skeptical.  


Julia Belluz

Senior health correspondent, evidence enthusiast

Julia Belluz is Vox's senior health correspondent, focused on medicine, science, and public health. She's covered topics as varied as the anti-vaccine movementAmerica's staggering maternal mortality problem, how dark chocolate became a health food, and what makes America's sickest county so unhealthy. She has also debunked numerous medical misinformation peddlers such as Dr. OzGwyneth Paltrow, and Alex Jones.

In 2015, Julia launched Vox’s Show Me the Evidence series, which goes beyond the frenzy of daily headlines to take a deeper look at the state of the science behind pressing health questions, from treatments for chronic back pain to why exercise is not helpful when it comes to weight loss.

Before joining Vox, Julia was a Knight Science Journalism fellow at MIT and her writing appeared in a range of international publications, including the BMJ, the Chicago Tribune, the Economist and Economist's Intelligent Life magazine, the Globe and Mail, the LA Times, Maclean’s, the National Post, Slate, and the Times of London. She holds an MSc from the London School of Economics.. She is the recipient of numerous journalism awards, including the 2016 Balles Prize in Critical Thinking, the 2017 American Society of Nutrition Journalism Award, and several Canadian National Magazine Awards. Outside of reporting, she speaks regularly at universities and conferences the world over, and has been a fellow at McMaster University. She holds an MSc from the London School of Economics. Follow her on Twitter @juliaoftoronto.

Linking Abaqus with fortran

Mon, 2018-01-15 08:45

In reply to Linking User Subroutines

hi again. about your comment"If anything fails then you have add the defined path(vc++ and fortran) in your environment variables untill you see pass...

", how can I add defined path in(vc++ and fortran) in environment variables?sorry I got such a problem. 

dl problems

Mon, 2018-01-15 08:04

In reply to ABAQUS built-in SMA model

hi Frank.thank you for explaining but the above files can't be downloaded.


the highest ranking journals publish the least reliable science

Sun, 2018-01-14 22:38

In reply to Nobel laureate Randy Schekman: How journals like Nature, Cell and Science are damaging science

Vox health reporter Julia Belluz has recently covered the reliability of peer-review. In her follow-up piece, she asked “Do prestigious science journals attract bad science?“. However, she only covered the data on retractions, but another study here shows that in six areas, unconfounded data covering orders of magnitude more material than the confounded retraction data reveal only two out of three possible general outcomes:

a) Non-retracted experiments reported in high-ranking journals are no more methodologically sound than those published in other journals.
b) Non-retracted experiments reported in high-ranking journals are less methodologically sound than those published in other journals

Not a single study we know of (there may be some we missed! Let me know.) shows the third option of higher-ranking journals publishing the most sound experiments. It is this third option that at least one analysis should have found somewhere if there was anything to journal rank with regard to reliability.

this epi journals are completely free

Sun, 2018-01-14 22:34

In reply to One thing many  open access

Dear Wenbin

   thank you for your comment!   Yes, many open-acces journals now charge authors --- even PRL, Nature Scientific Reports, and many other journals now are doing this.   Even less high-ranking like Hindawi charges APC of order 1000-2000€, which is not acceptable.

With Epi journals, the concept is different: you put your paper on arXiv,  for example, and submit a link to this paper to the Editorial board, after some reviews this link can be accepted to be included in the table of content of this journal.

The key point is that it's free and requires only a simple web-site and even no data storage. At least in the first time.

The main point is indeed to make it completely free.


Thanks Prof. Guo :)

Sat, 2018-01-13 23:48

In reply to nice work

Thanks Prof. Guo :)

One thing many  open access

Sat, 2018-01-13 23:15

In reply to Nobel laureate Randy Schekman: How journals like Nature, Cell and Science are damaging science

One thing many  open access journals has is the paper processing charges. I don't think many authors would like to pay to get their papers published. I am one of them. The ideal will be to create a journal completely free (free to the authors and free to the readers) and with enough credibility so that universities will be considered in their performance evaluations of their faculty.  

nice work

Sat, 2018-01-13 20:10

Thank you for the idea. The

Fri, 2018-01-12 20:26

In reply to Actually I do not have any

Thank you for the idea. The suggestions are very much appreciated. 

Thank you very much,

Fri, 2018-01-12 20:25

In reply to Re: Stresses in yielded shell

Thank you very much, Professor. 

For an epi-journal in Mechanics

Thu, 2018-01-11 14:23

In reply to Nobel laureate Randy Schekman: How journals like Nature, Cell and Science are damaging science

Some mostly french collegues are discussing actively about creating an epi-journal in Mechanics

Discussion group is here and I suggested them to move it to Imechanica too.


1. Building a community for an epijournal in Mechanics

The purpose of this discussion group is to promote the creation of an epijournal in Mechanics, namely an open access electronic journal taking its contents from preprints deposited on open archives such as arXiv or HAL. These preprints cannot be published elsewhere and undergo a rigorous review process similar to the best journals in the field.


More comments


Subscribe to Syndicate