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abouibes's picture

Bonds, bands and elasticity of smithsonite rock

The objective here is to spread out in detail the various fundamental state properties of smithsonite rock (ZnCO3) for which the most intrinsic quantities remain still unknown. First-principles electronic structure calculations based on the density functional theory with the pseudopotential method were performed using diverse functionals. A number of mechanical quantities were evaluated such as bulk modulus, elastic constants, Young's and shear moduli, and transversal and longitudinal sound velocities (VS and VP).

maosheng's picture

Post-Doctoral Fellows at BIC-ESAT in Peking University

The Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT) in Peking University (PKU) was founded in 2015 with a generous support from the Municipal Government of Beijing. The center focuses on the development of advanced manufacturing technology and energy and environmental technologies. Four research departments under the center are:
1) Advanced manufacturing and design;
2) Simulation and application of software;
3) Energy technologies;
4) Environmental technologies.

Meysam Majnooni's picture

The theory of thin shells / Viktor V. Novozhilov

Dear friends

I need "the theory of thin shells" by Novozhilov. As I look for it more and more, I find less and less. Can anyone help me to find that on net?

 

Thanks in advance

azadpoor's picture

PhD positions in my ERC project

I was recently awarded an ERC grant for which I will be hiring up to five new PhD students with different types of expertise. Actual hiring will take some time, as new researchers are needed at different stages of the project (not all PhD students will start at the beginning of the project). Interested candidates with the following backgrounds and skill sets are encouraged to contact me directly at azadpoor@gmail.com

composite fiber angle definition

Dear imechanicas,

When composite plates with cutouts are meshed, the mesh scheme around the hole is somehow not in a mapped shape. This means the edges of (for instance a four-node element) in undeformed shape are not in a rectangular format. Therefore, defining the constitutive equations of orthotropic materials might lead to incorrect results.

Does anybody have opinion/experience about this issue?

Any response is appreciated.

Regards

R_N_S_S 

Stress vector plot in ANSYS classic

Hello all,

I am using ANSYS classic for structure analysis.I have two load steps and I need to define the element coordinate systems for selected elements ( in 2nd load step) aligned with principal stress directions obtained from 1st load step.

Earlier I did this in workbench and there I was extracting the principal stress vector data for 'elemental mean' (shown in attached figure) and then in 2nd load step creating the local coordinate system using THXY, THYZ and THZX data. Then assigning this local coordinate systems to appropriate elements.

Zhigang Suo's picture

Chemical reaction

Attached are the slides for a course on engineering thermodynamics.  Before coming to class, please watch these two videos on fuel cells:  

Faculty Position in Mechanical Engineering


Faculty Positions in MECHANICAL ENGINEERING PROGRAM

The Physical Science and Engineering (PSE) Division at King Abdullah University of Science and Technology (KAUST) (http://pse.kaust.edu.sa) invites qualified applicants to apply for faculty positions at all ranks (Assistant, Associate, and Full Professor) in the Mechanical Engineering Program.

R&D Mechanical Engineer - Computational Mechanics and Constitutive Modeling (Senior or Principal)

About Sandia    

Sandia National Laboratories is the nation's premier science and engineering lab for national security and technology innovation. We are a world-class team of scientists, engineers, technologists, post docs, and visiting researchers all focused on cutting-edge technology, ranging from homeland defense, global security, biotechnology, and environmental preservation to energy and combustion research, computer security, and nuclear defense.

mortezaamjadi's picture

Computational analysis of metallic nanowire-elastomer nanocomposite based strain sensors

Possessing a strong piezoresistivity, nanocomposites of metal nanowires and elastomer have been studied extensively for its use in highly flexible, stretchable, and sensitive sensors. In this work, we analyze the working mechanism and performance of a nanocomposite based stretchable strain sensor by calculating the conductivity of the nanowire percolation network as a function of strain. We reveal that the nonlinear piezoresistivity is attributed to the topological change of percolation network, which leads to a bottleneck in the electric path.

Dario Schiano Moriello's picture

Application of Corotational Formulation

Hello,  I am a PhD student in Mechanical Engineering, and at the moment I am studying the co-rotational formulation from Criesfield's books.

I am looking for applications of the corotational formulation in ABAQUS or MATLAB; my supervisor suggested me it could be done in ABAQUS through a User Defined Element Subroutine, but being a new user to this software I don't really know from where I should start.

Noel ODowd's picture

Post Doctoral Researcher in Microstructural Modelling of Materials

A post doctoral position is available at the University of Limerick, Ireland. The object of the research, which is funded by Science Foundation Ireland (SFI), is to obtain an understanding of the mechanical behaviour of ferritic and martensitic steels at the micron and sub-micron scale and to link this behaviour to component behaviour. The work will involve computational and experimental studies of material behaviour using a range of numerical and experimental techniques.

post-buckling of circular FGM plates

Hi

I need some help to analyze post-buckling of circular FGM plates on elastic foundation.
contact me if this the field of interest of you.

thanks alot

UC Santa Barbara Mechanical Engineering Part-Time Temporary Lecturers

The Department of Mechanical Engineering at the University of California, Santa Barbara seeks applications for possible part-time Temporary Lecturer positions in all areas of Mechanical Engineering. Main duties may include teaching required lower or upper division ME courses, as well as upper division electives. The ideal candidate should be interested and experienced in teaching in different educational settings - from project-oriented, inquiry-based classes, to larger, more traditional, lecture-oriented classes. An M.S.

zappalorto's picture

Fourth International Conference of Nanomechanics and Nanocomposites (ICNN4)

The 4th edition of the International Conference of Nanomechanics and Nanocomposites (ICNN)  will be held in Vicenza from 14th to 17th of September 2016.

zappalorto's picture

Fourth International Conference of Nanomechanics and Nanocomposites (ICNN4)

The 4th edition of the International Conference of Nanomechanics and Nanocomposites (ICNN)  will be held in Vicenza from 14th to 17th of September 2016.

zappalorto's picture

Fourth International Conference of Nanomechanics and Nanocomposites (ICNN4

The 4th edition of the International Conference of Nanomechanics and Nanocomposites (ICNN)  will be held in Vicenza from 14th to 17th of September 2016.

Simpleware Case Study: Reverse Engineering Automotive Parts

Simpleware for automotive NDE and reverse engineering

Reverse engineering and analysing industrial automotive parts can be a challenge, given the complexity of materials used and the need for precision when processing image data. Researchers have used Simpleware ScanIP to overcome these difficulties in a project involving the conversion of CT data of a cylinder head into a high-quality 3D model suitable for inspecting defects and exporting simulation-ready meshes.

saberelarem's picture

Phase field modeling of damage and fracture in polycrystalline materials, support from the Chinese Scholarship Council

The ability of scientists and engineers to exploit, design and process new materials with improved properties has often been fundamental for the technological advances of societies. In fact, advances in many key domains like aerospace, automotive industry, energy, nanotechnology, rely on our ability to engineer new materials and to exploit their properties.

saberelarem's picture

Nonlinear dynamics of rotating shaft with a breathing crack - CHINA SCHOLARSHIP COUNCIL PhD for 2016

Because of the increasing need of energy, the plants installed by electricity supply utilities throughout the world are becoming larger and more highly stressed. Thus, the risk of turbogenerator shaft cracking is increasing also. The development and propagation of a crack represents the most common and trivial beginning of integrity losses in engineering structures.

saberelarem's picture

PhD program supported by China Scholarship Council CSC PhD Research Projects for 2016

In the last two decades, considerable observational and theoretical work has been devoted to all aspects of earthquake prediction research, for solving fundamental questions concerning the mechanics of fault systems, as well as for answering questions regarding earthquake hazard.The european natural observatory of the Corinth Rift (http://crlab.eu), a very rapidly deforming area (opening strain rate of ~10-6/yr) where one or more earthquakes with magnitudes above 6 are expected in the coming decades provides a frame

Staged excavation, staged construction ,abaqus 6.10, soil nailing wall, nail

Hello everyone,

 

I need to model soil nailing wall in abaqus based on staged construction.( first remove soil to expose the slope then active the nail and then apply shotcrete facing),

i guess its required to assemble; soil deposit(plain strain element)+nail (beam element)+ facing(beam element),

step 1; geostatic step

step 2; remove the soil to create slope

step 3; active nail ()

step 4; active facing

is that right?

any help would be greatly appreciated 

TUNNEL lining,

Hello guys,

 

I need to model  tunnel lining in abaqus 6.10. i'm guessing that its required to ;

1.reduce the modulus E of soil (relaxation) up to 40%- 50% (how can i do that in abaqus????)

2. active the lining (beam element+ assembled, am i right on assembly ?)

3. remove the soil using *MODEL CHANGE, REMOVE

i was wondering how can i model that ?

any help or suggestion greatly appreciated,

 

Sulin Zhang's picture

Hierarchical porous Si can breath lithium without causing volume change

Electrochemical lithiation/delithiation causes 300% volume change in solid silicon. Whereas hierarchical porous Si synthesized by GM causes negligible apparent volume change when breathing lithium.  

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