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Updated: 12 hours 30 min ago

Fracture energy and mode independent failure mode

Sat, 2018-03-24 08:09

In reply to Bridge

Dear All, 

I have to specify different values of fracture Energy in each mode, for example Mode I, Mode II and Mode III particularly by using the principle of mode indepedent situtation, in the available commercial Finite Element Code ABAQUS. But I noticed that in the available commercial ABAQUS finite element code, where it is possible to define different values of fracture energy only if one adopt  mixed mode condition. It is because, the available interaction criteria such as  power law and BK which are allow to specify individually fracture energy for each mode but in such situations are mode are depedent.  Therfore, is there alternative method to specify the different values of  fracture energy for each mode in ABAQUS for the case mode indepednet condition?  

 

Post-Doctoral Position: National University of Ireland Galway

Thu, 2018-03-22 16:21

In reply to Post-Doctoral Position:Finite element analysis and experimental testing of blood clots and design of thrombectomy devices

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Project title: Finite element analysis and experimental testing of blood clot fracture and design of thrombectomy devices to remove clots from vessels in the brain

Post-Doctoral Position: National University of Ireland Galway

Thu, 2018-03-22 16:20

In reply to Post-Doctoral Position:Finite element analysis and experimental testing of blood clots and design of thrombectomy devices

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<p class="MsoNormal"><strong style="mso-bidi-font-weight: normal;"><span style="text-decoration: underline;">Project title: </span>Finite element analysis and experimental testing of blood clot fracture and design of thrombectomy devices to remove clots from vessels in the brain</strong></p>

Courant–Friedrichs–Lewy | CFL number

Wed, 2018-03-21 21:49

In reply to CFL number

CFL which is also known as Courant–Friedrichs–Lewy is a condition involved in the important role of measuring the stability of unstable computational numerical methods involved in modeling of convection or wave phenomena.  Effectively, the CFL condition helps to clearly express the net distance that any information travels during the timestep length within the mesh must be lower than the distance between mesh elements. This means that information from a given cell or mesh element must propagate only to its immediately adjacent neighbors.

From my experience, the solver must be able to keep the maximum Courant number around 0.5 in order for the simulation to converge nicely. 

PhD position,Texas A&M University, College Station, TX, USA

Mon, 2018-03-19 21:34

In reply to April 10, 2018 Web Workshop - Introduction to Simpleware Software

Immediate PhD position in Energy, control, and Optimization (ECO) lab in Mechanical Engineering department at Texas A&M University. The project is related to Renewable energy and grid distribution and is Computational. Being familiar with Matlab, python and Optimization algorithms and Machine Learning methods is Plus. Please send your CV to shima.hm@tamu.edu

I have update the final

Mon, 2018-03-19 07:10

In reply to final version published with some errata corrige

I have update the final version also on imechanica (see PDF attached). 

Tanks!

Fri, 2018-03-16 22:46

In reply to Hi Xiaoyan,

Hi Wendy,

Thank you very much for your explanation which is very helpful for my understanding of superlattices self-assembled by nanoparticles.

Xiaoyan

Hi Team,

Fri, 2018-03-16 15:08

In reply to Peridynamic theory vs. classical continuum theory

Hi Team,

 

I have gone through some papers on Peridynamics which tell that in Peridyanamics the ideas of " force per unit area" and "stress tensor" are not used. Then which are the quantified values can we calculate from the Peridynamics simulation.

Help will be appreciated.

--

Fri, 2018-03-16 12:41

Hi Mohamedlamine, 

Thu, 2018-03-15 18:15

In reply to Dynamic behavior of nanomaterials

Hi Mohamedlamine, 

Thanks for the question! 

The ductility/brittleness of the self-assembled materials largely depends on the properties of the organic ligands attached to the particles. In my work, this ligand was polystyrene (brittle at room temperature) so the self-assembled structures were brittle (but with high elastic modulus). Detailed cyclic testing has not been performed (a few cycles of deformation has been carried out in Heinrich Jaeger's work). I would not expect these materials to have the properties of sandwich laminates because of the large differences in their structures. 

Wendy

Hi Xiaoyan,

Thu, 2018-03-15 18:08

In reply to Thank you very much!

Hi Xiaoyan,

Nanoparticle self-assembly follows the same principles as (atomic) crystal growth. Superlattice growth begins when a solid aggregate of nanoparticles nucleate from the liquid phase, and gets bigger when additional nanoparticles are added to the initial solid cluster. A 2D structure will form when growth is confined to the lateral directions. This can occur when the particles are placed on an immiscible fluid interface, or a solid substrate that is well wetted by the nanoparticle solution. 3D nanoparticle crystals by allowing growth in 3-dimensions, such as by gently destabilizing nanoparticles in solution by adding an anti-solvent (i.e. adding acetone to a hexane-nanoparticle solution) to induce the particles to crystallize. 

Thank you for the question!

Wendy

Dynamic behavior of nanomaterials

Wed, 2018-03-14 17:38

In reply to Journal Club for March 2018: Colloidal Self-Assembly of Architected Nanomaterials

Dear Xwgu,

Very interesting analysis.

What is the behavior of these new nanomaterials under cyclic loadings. It is shown in figures 1.A and 1.B that the materials may have a somewhat brittleness. Are they very elastic like you have cited the elastic modulus' values or do they have dynamic displacements similarly to sandwitch laminates i.e cyclic and linear stresses ?

CV

Fri, 2018-03-09 21:04

In reply to Research in Fluid Structure Interaction: Looking for PhD position

I have an open position in my lab at Texas A&M University for May 2018. If you are interested please send your CV to "shima.hm@tamu.edu".

Hi Ahmed,

Mon, 2018-03-05 23:45

In reply to Very interesting review

Hi Ahmed,

Thank you for the thought provoking questions!

1) I am not aware of any studies on the dynamic response of these structures, but the type of phenomena that you bring up should be of interest.  2) It's possible that the mechanical properties of the self-assembled structures would depend on the substrate. A corrugated surface could affect the mechanical properties of the resulting structures if the curvature of the corrugations is on the order of the nanoparticle spacing (~10 nm). I would imagine that the amount and direction of residual strain in the superlattice is affected if the polymeric ligands conform to a curved surface in some non-equilibrium configuration. This could be interesting! 

in the case of larger adhesion, the problem is interesting

Mon, 2018-03-05 16:55

In reply to a "contact sport" between academics

The contact challenge was devised in the not very interesting case where there is extremely low adhesion, with no stickiness and no pull-off.

A more interesting and "challenging" problem (perhaps worth a contact challenge 2.0), is the case with significant adhesion.

Recently, I derived an approximate, but simple closed form result, see here.  Previously I had developed a BAM model, so the number of models start to be significant, with the ones I propose being also simple equations, whereas I have not had time to implement the very complicated Persson's proposals.

Thanks

Mon, 2018-03-05 07:02

In reply to Hi Teng,

Hi Wendy,

Thanks for your detailed explanation.

Best,

Teng

Thank you very much!

Mon, 2018-03-05 04:16

In reply to Hi Xiaoyan!

 Hi Wendy,

Thank you very much for your clear explanations, which are very helpful for my understanding the self-assembly of nanoparticles.

I have one more questions: as you exemplified in this review, some nanoparticles can assemble into 2D membrane structures, while the other nanoparticles can form 3D super-lattice structures. What is the main difference in self-assembly of nanoparticles during formation between 2D and 3D structures? Thank you very much in advance!

Very interesting review

Sun, 2018-03-04 23:02

In reply to Journal Club for March 2018: Colloidal Self-Assembly of Architected Nanomaterials

Hi Wendy, 

Thank you for the very interesting and well written article. I have a couple of questions:

 1- These assembled structures show some kind of periodicity. Has there been any studies on their dynamic response and their wave mitigation properties? Periodic structures may exhibit frequency band gaps and may have extreme properties (e.g. auxetic response, negative refraction,..etc). Existence of defects may lead to breakage in Parity time symmetry, unidirectional wave propagation, and localized modes. Are these phenomena of interest to the community of researchers working on that scale? 2-I wonder what the effect of the substrate curvature on the self-assembly process and the mechanical response of the resulting structures is. In particular, what happens if we introduce corrugation in the substrate and assemble the nanoparticles on the resulting topography. There should be some effect on stiffness and toughness of the resulting membrane. It is also possible that there will be some residual stresses or inelastic deformation locked in due to synthesis on curvilinear geometry. I am interested in designing tunable and adaptive materials system and thus I am curious about such effects on the nanoscale. Thanks again for the intriguing discussion and good luck in your future endeavors!

We can only accept one more

Sun, 2018-03-04 22:50

In reply to Master/ PhD/ PDF positions in mass timber construction research at the University of Alberta, Edmonton, Canada

We can only accept one more PhD student with background in structural/ seismic engineering. All the other positions are alomost filled. 

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