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Updated: 7 hours 40 min ago

Publication update

Wed, 2016-08-31 15:44

In reply to Overhead Electrical Conductor in bending: Papailiou's model revisited

Paper by Foti and Martinelli, published in Applied Mathematical Modelling, Vol. 40, Nos 13-14, July 2016, pp. 6451-6467

Congratulations, Shengqiang!

Wed, 2016-08-31 08:14

Congratulations, Shengqiang!

Tue, 2016-08-30 09:52

In reply to Shengqiang Cai will be the new editor of the iMechanica Journal Club

Congratulations for being selected as the new editor of the iMechanica Journal Club in recognition of your contribution!

Enquiry on Tenure Track Position

Mon, 2016-08-29 16:41

In reply to Two Tenure Track Faculty Positions (Assistant/Associate Professor), Department of Aerospace Engineering and Mechanics, The University of Alabama

Hi Prof. Unnikrishnan, I am a PhD graduate (Mechanical Engineering) in 2012 from University of Maryland, College Park under Prof. Abhijit Dasgupta since when i have gained industry level experience for a few years. At this juncture i was searching for a university level research position. I wanted to run through you my credentials if you have time and get your feedback if i am run any chance to land at least an interview call for a tenure track position at your department. I did extensive level of modeling and experiments on fracture and fatigue in material systems at continuum and micro/nano scale during my PhD years. The materials i have generally worked with are metals and alloys with emphasis on material interfaces. I want to move forward my career more aligned to the field of mechanics of material and therefore have grown interest to work under you. I have 2 published journal papers, one book chapter and numerous conference publications. Last few years in the industry didn't give me an opportunity to publish that much but i gained quite a bit of practical experience. I can send you more details if you want (resume, cover letter) if you want to take a look. Didn't want to clog with inbox right away. Let me know.  Thanking in anticipation, ~Koustav Sinha, PhD    

I am interested

Mon, 2016-08-29 13:44

In reply to One Joint Ph.D. position and one postdoctoral position available at Singapore University of Technology and Design

Hi,

This is guru from India. I am interested for the advertised position. I am interested to Phd.

Let me know how to proceed further

Eiffel tower marks the birth of applied mechanics

Mon, 2016-08-29 05:55

In reply to Eiffel's Tower marks the birth of applied mechanics

Using an ANSYS model for same height and load bearing functionality (as a visitors' monument) with self weight,wind and earthquake resistance etc., can one optimize/redesign for another structural configuration using only a fraction of weight of steel originally used? What such lighter re-designs have been made so far?

Eiffel tower marks .... mechanics

Mon, 2016-08-29 00:50

In reply to Eiffel's Tower marks the birth of applied mechanics

Interesting Cauchy and Lame stayed on Paris outskirts  maybe for their undisturbed researches?...

This could be a nice textbook for advanced undergrad course

Fri, 2016-08-26 19:44

In reply to Imperfections in Crystalline Solids

Well done!

PS: I occasionally teach metallurgy of deformation, using Hertzberg's book. But this is graduate course.

I have found the paper you

Wed, 2016-08-24 23:30

In reply to Sorry for not get back to you

I have found the paper you linked. But that MS thesis work include elastic approach. No plasticity model used.

Re: Heaviside enrichment in the X-FEM

Wed, 2016-08-24 23:03

In reply to Why two different heaviside enrichment functions used in XFEM?

You obtain the same solution since the approximate space that they span are identical. More details on this topic can be found in the article available at: http://imechanica.org/node/19267 .

-suku.

Hi, I am using Drucker-Prager

Wed, 2016-08-24 22:59

In reply to model for ballast material

Hi, I am using Drucker-Prager model but not yet quite successful. The problem is it is not capturing the continues plastic strain. Did you find anything?

Sorry for not get back to you

Wed, 2016-08-24 22:57

In reply to Hey, To model ballast and

Sorry for not get back to you soon. Somehow I got missed my imechanica account now i found and back. Yes, Actually I am using D-P model, but the problem is it is not capturing the continues plastic strain. Within 3-5 cycles the plastic strain stabilise. Based of my lab test results, my plastic strain continuously has increasing value up to 10,000 cycles and then get stabilise. You have any idea what controlling in D-P model that my plastic strain stabilise in 3-5 cycles. Also could you please send the link again, may its expired. Thanks for your reply and appreciate it.

Deeply Sad to Hear This

Wed, 2016-08-24 06:16

In reply to Professor Christian Miehe passed away

I personally did not meet professor Miehe, but I have read many of his inspiring works and have used them in my own works. As far as my field of research is relevant, his contribution to computational plasticity is remarkable. An uncountable number of publications is a good indication of his knowledge in other fields of computational mechanics. I believe the computational mechanics society has lost a great scientist in this field.

Mohsen

Hi Vahid,

Tue, 2016-08-23 12:34

In reply to Phase field modeling of phase transformation using Comsol?

Hi Vahid,

Have you had luck in finding a COMSOL model for phase transformation? I am trying to simulate similar problem.

I have a simple heat transfer + solidification COMSOL model that I can share with you, however no phase transformation is included.

Best,

Mehdi

Dear Christopher, 

Mon, 2016-08-22 19:51

In reply to Journal Club Theme of April 2016: Boundary conditions in atomistic simulations for extended defects in solids

Dear Christopher, 

 

Thanks for bringing this one up. It is remarkable that this aspect is not as much discussed 

in literature as you have pointed out. Especially for those interested in multiscale modeling, it is important to remember the underlying boundary conditions and its effects on dislocation dynamics for example. 

I was wondering though if  you could also comment if for determining properties of individual dislocations like an Peierls stress of edge dislocation, if it is sufficient to use periodic boundary conditions along the dislocation line direction only?

Because once you introduce an edge dislocation or say a mixed dislocation it would result in a step on the surface of the crystal. If one has a sufficiently large box, would the Peierls stress be reliable?

-Thanks

Very very sad to hear that

Sat, 2016-08-20 10:19

In reply to Professor Christian Miehe passed away

Very very sad to hear that and very shocking as well. I was his student at the COMMAS course and we all unanimously agreed that he is probably one of the best teachers with such profound knowledge of the subject. Always remember his passion for teaching and research. 

I found it

Fri, 2016-08-19 15:02

In reply to Hi Dear Kasra, I am sure you

Dear Pooya,

I am glad to find you here ... I found the software I was looking for i. ParaView.

Thanks for the help though.

Best

Kasra

 

fut

Fri, 2016-08-19 14:40

In reply to New SIMULIA Tech Brief: Cogging Torque Analysis of Permanent Magnet Machines using Abaqus/Standard

OK, Magnet Machines domain's is very interesting to study and work

try to used it to monedas fifa 17  project...

more for the future

Ok, I think I got it. So if I

Fri, 2016-08-19 09:51

In reply to Dear Aleksander,

Ok, I think I got it. So if I understand you correctly, both Hill48 and von Mises criteria are based on critical value of distortional energy. In case of von Mises criterion, the limit energy is the same for every direction (isotropic criterion) - as a result the deviatoric projection of the criterion is circle. However, when we consider Hill48 model, the energy threshold is dependent on the direction of loading (anisotropy). As a result, the deviatoric projection is an ellipse. The material coordinate system is aligned with major/minor axis of said ellipse and so the quadratic form can be defined with diagonal matrix, correct? The last think that comes to my mind would be to ask if material directionw (min/max strength of material - according to Hill) are always aligned with the direction of manufacturing? I assume we are discussing materials that can be reasonably well modelled with Hill criterion, e.g. thin sheets of metal. 

Once again thank you very much, your insight was really helpful.

Aleksander

Dear Aleksander,

Thu, 2016-08-18 12:53

In reply to Dear Stefan,

Hill's quadratic is analogous to an elastic strain energy (or its conjugate, in stress space), with the additional feature of incompressibility. The "stiffness" matrix is its Hessian. This is in the "diagonal" form in the symmetry frame. As we know from linear algebra, any quadratic can be diagonalized by performing appropriate (orthogonal) transformations. With one major difference: here the transformations are those induced in the stress space by orthogonal transformations in the coordinate space (the 3D space) - the usual transformation formulas for the stress components under a change of coordinates.  

Good luck,
Stefan

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