The Center for Modeling, Simulation and Imaging in Medicine (CeMSIM) at Rensselaer Polytechnic Institute, Troy, NY, USA invites
applications for multiple positions (Research Assistant Professor,
Research Scientist/Research Associate, postdc) to work on projects
funded by the NIH on developing interactive computational technology. Desirable background for this position
- PhD in Mechanical Engineering or related field
- Strong background in Nonlinear Solid Mechanics and Computational Linear Algebra
- Strong background in Finite Element/Meshfree computational analysis
- Domain discretization (mesh/particle) algorithms and implementation
Effect of geometric parameters on the stress distribution in Al 2024-T3 single-lap bolted joints- Outstanding Paper Award WinnerSubmitted by Payam Soltani on Sat, 2014-01-04 14:20.
The article entitled “Effect of geometric parameters on the stress distribution in Al 2024-T3 single-lap bolted joints” published in International Journal of Structural Integrity
Applications are invited for few open positions in the area of
multiscale simulation of fatigue and fracture of advanced alloys and
nano-material based composites. Primary focus of this research is investigation
of fatigue and fracture behavior of nanomaterials and to develope various
constitutive models for continuum, based on large scale atomistic simulations.
Research effort will include development of analysis and design methods toward
improving material/structural behaviour using computer simulation. Interested
candidates should have preferably MTech/ME degree in
mechanical/civil/aerospace/material engineering discipline with good knowledge
Three-dimensional simulation of crack propagation in ferroelectric polycrystals: Effect of combined toughening mechanismsSubmitted by Amir Abdollahi on Fri, 2014-01-03 06:43.
We simulate the fracture processes of ferroelectric polycrystals in
three dimensions using a phase-field model. In this model, the grain
boundaries, cracks and ferroelectric domain walls are represented in a
diffuse way by three phase-fields. We thereby avoid the difficulty of
tracking the interfaces in three dimensions. The resulting model can
capture complex interactions between the crack and the polycrystalline
and ferroelectric domain microstructures. The simulation results show
the effect of the microstructures on the fracture response of the
material. Crack deflection, crack bridging, crack branching and
ferroelastic domain switching are observed to act as the main fracture
toughening mechanisms in ferroelectric polycrystals. Our fully 3-D
The velocity and instability of crack motion in 2D hexagonal lattice of graphene under pure opening loads
are investigated by atomistic molecular dynamics simulations. The brittle crack along zigzag direction
in a strip can propagate supersonically at even 8.82 km/s under uniform normal loading of edge
displacements. Crack moving straightly at low speeds produces atomically smooth edges, while kinking
occur beyond a critical speed around 8.20 km/s equivalent to 65% of Rayleigh-wave speed in graphene,
which validates previous theoretical predictions of rapid fracture instability in elastodynamics, and
rough and irregular edges with oscillatory overhangs are formed subsequently.
Happy New Year!
The 17th U. S. National Congress on Theoretical and Applied Mechanics that will be held June 15-20, 2014 at Michigan State University, East Lansing, Michigan. (http://www.usnctam2014.org/)
George Z. Voyiadjis inducted into the Polish Academy of Sciences (pictured with Michal Kleiber - September 2013)Submitted by Pawel Woelke on Thu, 2014-01-02 10:34.
Please join me in congratulating George Z. Voyiadjis, chair of LSU Department of Civil and Environmental Engineering, on his induction into the Polish Academy of Sciences.
I read with interest an excellent discussion about Linear Algebra in Mechanics. I am attaching Chapter I: Tensor Preliminaries from my book Elastoplasticity Theory, which includes Hill's analysis of induced tensors mentioned in the discussion.
Dielectric Elastomers (DE) are promising materials for developing soft machines (e.g., a human-made octopus). The principle of actuation has gained to DE the name "artificial muscles" since they can undergo large deformation when excited by an electric field. Another class of active materials that can be actuated by external field is Magnetoactive Elastomers (MAE). Although MAE and DE share mathematical similarities, the physics is different. Electric field can induce polarization in elastomers, and hence generate electrostatic stresses within the material. As a response to the electrically induced stresses, the material deforms. For MAE the situation is different: elastomers are magnetically inactive, and a similar to DE effect is achieved by mixing the elastomer with magnetically active particles (e.g., carbonyl iron, nickel or Terfenol-D). Thus, due to the magnetic interaction of the particles embedded in a soft matrix, the composite can deform and modify overall stiffness as a response to a magnetic field. The performance of these composites can be further enhanced by optimizing microstructures. Indeed, a similar idea applies for designing DE composites with enhanced properties. These composites, once manufactured can solve the bottle-neck problem of DE technology - the need in extremely high electric fields for meaningful actuations, and potentially lead to a breakthrough in the technology.
I was curious whether there are any
experimental information and / or results regarding the out of plane (anti-plane)
deformation of (very) thin films. For example an elastic thin film subjected to anti-plane loading on its surface. Any other suggestions regarding possible applications of anti-plane loading conditions in thin films would be appreciated.
Thanks a lot,
How to consider a pretwisted tapered propeller balde either as beam orplate
When I was updating my very brief notes on tensors, it occurred to me to post on iMechanica a request for recommendation of textbooks on linear algebra. I was delighted to see Arash respond. I then asked for his opinion about the definition of tensor. He responded again, and we seemed to agree. Then Amit joined the discussion, and then others. That thread has become very interesting and very long.
But I have another issue with the way we use linear algebra. I wish to get your opinion. The issue is about scalars.
For my project I need to learn nonlinear finite element method (FEM) and composite materials. I am familier with linear FEM. Please suggest me good book for nonlinear FEM which will have good explanation of the subject. Also, please suggest book on composite materials especially having lot of solved examples. I know there are lots of experts in this subject on imechanica, so please give me some suggestions. Thanks.
A RA (MS level) position is available in the Department of Engineering Technology, University of North Texas-Denton in the fields of piezoelectric sensor modeling and experiment. The position will start from Summer, 2014. Candidates should have a Bachelor/Master's degree in engineering mechanics, mechanical engineering or electrical engineering with good academic standing and should have some experiences in the following:
(1) Modeling of electromechanical devices such as sensors and energy harvesters,
(2) Proficient in LABVIEW or MATLAB- based experiment test,
(3) Fundamental knowledge in solid mechanics,
(4) Sensor circuit development.
I attach some class notes developed by the late Professor Donald Carlson from which many generations of students at the University of Illinois learnt Continuum Mechanics.
Linear algebra is significant to many aspects of mechanics. For some years I have been using the book by Shilov. But this book may or may not be a good one to recommend to a student, depending on his or her prior experience. On StackExchange Mathematics, there are several excellent threads discussing textbooks of linear algebra. A particular recommendation was made for textbooks of linear algebra at three levels. Do you have any recommendations?
I am looking for a closed form analytical solution for the critical bucking load of a timoshenko beam with clamped-free BC.
please help me i'm in rush!!!
Thanks in advance
As you may know, our research group has, with my leaving the UK, moved in part to Luxembourg, where I am now based. I am of course keeping close ties with Cardiff, where Pierre Kerfriden is now taking care of the group.
It has been a fun and productive year, and I thank you all for contributing to this through numerous discussions emanating from this blog. I wish you all the best for 2014, and hope that it will bring you joy in the work you do.
Best regards from Lausanne where we are enjoying a few days off.
PS : the group’s publications are available on this repository: http://orbilu.uni.lu/simple-search?query=bordas
Harnessing Localized Ridges for High-Aspect-Ratio Hierarchical Patterns with Dynamic Tunability and MultifunctionalitySubmitted by Changyong Cao on Wed, 2013-12-25 21:40.
Harnessing Localized Ridges for High-Aspect-Ratio Hierarchical Patterns with Dynamic Tunability and Multifunctionality, Advanced Materials, DOI: 10.1002/adma.201304589.
There is a SIAM conference on life science on August, 2014. See website http://www.siam.org/meetings/ls14/
I want to organize a minisymposium on topic of "soft tissue modeling
by bio-mechanics". The organizer is responsible for inviting three more
speakers. I would like to know if any of you have interest considering yourself as one of the speakers for a 25
minute talk. If the application of this minisymposium is successful,
most probably you can get the travel support from SIAM if you are a student or a postdoc.
If you are interested, please reply to email@example.com with the title of your talk (no abstract of your talk at this stage).
hi every body:
What's your idea? The virtual displacement is special case of hamilton's principle or the hamilton's principle come from virtual displacement? Or, Which is older?
I want to analyse the inspection interval for the crack propagation in a gusset plate of a truss joint subjected to dynamic loading. I have the dynamic stress time history acting on the plate. Since I am new to abaqus I dont have much idea how to model the crack in the plate.Please kindly help me with this.
Thanks and regards,
COURSE NL14: NONLINEAR COMPUTATIONAL SOLID & STRUCTURAL MECHANICS. Theoretical formulations, technologies and computations.Submitted by eli_compmech on Fri, 2013-12-20 11:00.
We are glad to announce the 2014 version of the course:
NONLINEAR COMPUTATIONAL SOLID & STRUCTURAL MECHANICS. Theoretical formulations, technologies and computations. Pavia, May 5-9, 2014