iMechanica

Hi all, 

[Warning: The writing is long, as is usually the case with my posts :)]

It all began with a paper that I proposed for an upcoming conference in India. The extended abstract got accepted, of course, but my work is still in progress, and today I am not sure if I can meet the deadline. So, I may perhaps withdraw it, and then submit a longer version of it to a journal, later.

Mandelbrot has passed away last week.  A very interesting  mathematician, who received tenure from Yale only at 75, he has introduced fractals also in fracture mechanics.

Benoit Mandelbrot, Father of Fractals, Dies at 85

    There is a new opening (Full time) for Materials Engineer with emphasis upon computational materials design and modeling. Also, there is an opening for Graduate and Undergraduate intership at QuesTek Innovations LLC located in Evanston, IL. Additional details available at www.questek.com

Rajesh

A Research and Development Scientist position in developing multiscale-multiphysics computational technologies for composite materials and structures is available immediately at the Multiscale Design Systems, LLC located in New York City. The candidate should hold a doctoral degree in a relevant discipline, such as Mechanical, Aerospace or Civil Engineering. The candidate should have a strong background in multiscale simulations and scientific programming (C, C++, or Fortran).

We have an opening for a postdoctoral scholar in the area of computational mechanics. Specific problems of interest include the nonlocal plasticity, molecular dynamics and meshless methods for continuum damage mechanics. Rich experience of C++, X-windows image processing, and Fortran programming (especially parallel processing) is required. Contact: Professor Jung W. Hong at Michigan State University.  Email: jwh@egr dot msu dot edu.

A new postdoctoral position in continuum mechanics is available at the Weizmann Institute of Science. Candidates should have a strong background in physics and/or theoretical mechanics, as well as experience with analytical and computational methods for solving partial differential equations. Possible projects include the mechanics of frictional sliding, the mechanics of biomaterials, the mechanics of glassy materials and dislocation-mediated plasticity. Highly motivated candidates are requested to send their CV, publications list and statement of research interests to Dr.

This paper studies the poroelastic behavior of an alginate hydrogel by a combination of theory and experiment. The gel—covalently crosslinked, submerged in water and fully swollen—is suddenly compressed between two parallel plates. The gap between the plates is held constant subsequently, and the force on the plate relaxes while water in the gel migrates. This experiment is analyzed by using the theory of linear poroelasticity.

Hi all,

I am conducting some cohesive crack simulations within the framework of XFEM. The cohesive model is an initially rigid traction-separation law for mode I.  In order to deal with negative values of the normal sepration/jump, I use a penalty stiffness K.

This paper uses a method based on indentation to characterize a polydimethylsiloxane (PDMS) elastomer submerged in an organic solvent (decane, heptane, pentane, or cyclohexane).  An indenter is pressed into a disk of a swollen elastomer to a fixed depth, and the force on the indenter is recorded as a function of time.  By examining how the relaxation time scales with the radius of contact, one can differentiate the poroelastic behavior from the viscoelastic behavior.  By matching the relaxation curve measured experimentally to that derived from the theory of poroelasticity, one can identify

Dear all,

           I did a 3 pt bending impact simulation with an elasto plastic model. But the slope of contact force vs time curve is too steep at the beginning of the impact. One trivial way of reducing the slope is by reducing the young's modulus of elements in the vicinity of contact or the impactor. Also reducing the mass of the impactor and the impact velocity did not help in reducing the slope.

Is there any other non-trivial parameters that controls the slope of contact force vs time plot? Thanks ina dvance.

I solved the mode shape of the clamped-pinned boundary conditions, a undefined parameter, 'c' is appearing in the mode shape of the coloumn.

Query:1)  Could anyone would like to discuss on this undefined parameter, 'c'. it is critical to define the final modeshape of the column.

Non-linear buckling.

I will be teaching a sophomore level class  mechanics of materials class.  The class will cover mechanics of basic strength of materials (e.g. beams, pressure vessels), but I also want to teach basic elements of failure mechanics (fracture, fatigue, plasticity, and wear.)  I'm looking for a recommendation of an undergrad mechanics textbook that covers the fracture, fatigue, plasticity, and wear.  The students will have had a statics and mechanics class and their textbook already covers strength of materials.  Thanks.

TATA/EPSRC PhD studentship: Modelling of phase separation in steelmaking  Imperial College London - Department of Materials  Duration of Studentship: 42 months  Applications are invited for a studentship in the field of clean and green steel processing, leading to the award of a PhD degree. The post is to conduct research in the Department of Materials at Imperial College London and is supported by an initial bursary of £16,570 (including £3,000 p.a.

 Open PhD position in computational methods and inverse
problems in cardiovascular biomechanics 

A highly motivated PhD student is sought for research in
computational methods and inverse problems at the University of Pittsburgh
(Pitt) Department of Bioengineering (BioE).

The computational nanomechanics laboratory (http://people.bu.edu/parkhs/), which is based at Boston University under the direction of Prof. Harold Park, is looking to recruit a highly motivated and independent postdoctoral researcher to study, via the development of new computational methodologies, various scientific issues surrounding the mechanics of crystalline nanostructures.  The position is available for a 1-year duration, with possible extension to future years depending on the availability of funding.  

Sigma technology to participate in ansys RDO webinar series

Multilevel Robust Design Optimization IOSO technology coupled with ANSYS CFX will be shown for real-life application

The Department of Mechanical Engineering at the Johns Hopkins University invites applications for a full-time lecturer position. The individual selected for this position will be expected to contribute to the department’s educational mission through teaching, course development, and advising and mentoring students. They might also engage in mechanical engineering scholarship. Johns Hopkins is a private university well known for its commitment to academic excellence and research.

Abstracts for the 2011 APS Topical Conference on Shock Compression of Condensed Matter are now being accepted.  This biennial meeting is the premier conference for shock compression, behavior of materials at high pressures and high strain rates, and related areas.  We hope you will be able to join us for an outstanding Conference in Chicago, Illinois, June 26 - July 1, 2011.