dynamics

(to appear in International Journal of Fracture; Proceedings of the 5th Intl. Symposium on Defect andMaterial Mechanics)

Amit Acharya and Claude Fressengeas

 In countries with a moderate seismic hazard, the classical methods
developed for strong motion prone countries to estimate the seismic
behaviour and subsequent vulnerability of existing buildings are often
inadequate and not financially realistic. The main goals of this paper
are to show how the modal analysis can contribute to the understanding
of the seismic building response and the good relevancy of a modal model
based on ambient vibrations for estimating the structural deformation
under weak earthquakes. We describe the application of an enhanced modal
analysis technique (frequency domain decomposition) to process ambient
vibration recordings taken at the Grenoble City Hall building (France).

Location: Ecole Normale Supérieure de Cachan, LMT Cachan, South of Paris, France
Duration: 18 month
Starting date: Between March 2011 and September 2011
Scholarship: €2000/month

Contacts:     

The group of Mechanics of Solids and Structures at the  University of
Brescia is seeking two candidates for Ph.D. positions. The appointment
is starting on January 1st 2011, application deadline Sept. 15th 2010.

The research topics involve: computational dynamics of solids with
reference to ground motion simulation due to seismic input, multiscale
computational fracture mechanics and discrete dislocation mechanics.

ARC and CRC APAI PhD Scholarships in Rail Engineering

The ADINA System offers comprehensive capabilities for linear and nonlinear finite element analysis of solids & structures, CFD, fluid-structure interactions, multiphysics, and complete pre- and post-processing with interfaces to various CAD and CAE systems. It also offers user subroutines for material models, elements, loads...

Please find attached the position description

Lecturers - University of Michigan-Shanghai Jiao Tong University Joint Institute

Please see the attached file of the 1st announcement.

One PhD scholarship (only for European citizens), funded by the Spanish local government of Andalucia, is currently available in the Department of Structures and Construction at the University of Seville (Spain). The PhD position is associated to the Project “Partitioned formulations for dynamic and contact problems” with Professor Ramon Abascal and Professor Jose A. Gonzalez (japerez@esi.us.es) as principal researchers.

Professor Ed Berger, Univeristy of Virginia Mechanical Engineering, is featured in the Chronicle of Higher Education for his use of web technologies and, in particular, "video solutions" for teaching undergraduate mechanics courses. See http://chronicle.com/weekly/v54/i34/era01301.htm.  Or contact Berger at berger@virginia.edu.  Ed hasn't used this approach for all undergraduate mechanics courses as yet, but the potential is there. 

Please see attachment for details of Computational Mechanics researcher openings at Industrial Research (www.irl.cri.nz), a Crown Research Institute in beautiful New Zealand.

The role involves the application of advanced modeling and simulation methods to research on solids and structures, with an emphasis on complex systems such as composites and meta-materials, or solids with multiple defects and discontinuities.

The position is research oriented but also provides opportunities to consult with industry on commercial projects.

Candidates with expertise in theory and computation of elastic wave propagation, the mechanical behavior of composites, structural dynamics, or acoustics are encouraged to apply.

You are cordially invited to submit an abstract to the symposium on “Emerging Methods To Understand Mechanical Behavior” at 2008 TMS annual meeting, New Orleans, LA, March 9-13, 2008.  

Rui Huang and Se Hyuk Im, Physical Review E 74, 026214 (2006).

A stressed thin film on a soft substrate can develop complex wrinkle patterns. The onset of wrinkling and initial growth is well described by a linear perturbation analysis, and the equilibrium wrinkles can be analyzed using an energy approach. In between, the wrinkle pattern undergoes a coarsening process with a peculiar dynamics. By using a proper scaling and two-dimensional numerical simulations, this paper develops a quantitative understanding of the wrinkling dynamics from initial growth through coarsening till equilibrium. It is found that, during the initial growth, a stress-dependent wavelength is selected and the wrinkle amplitude grows exponentially over time. During coarsening, both the wrinkle wavelength and amplitude increases, following a simple scaling law under uniaxial compression. Slightly different dynamics is observed under equi-biaxial stresses, which starts with a faster coarsening rate before asymptotically approaching the same scaling under uniaxial stresses. At equilibrium, a parallel stripe pattern is obtained under uniaxial stresses and a labyrinth pattern under equi-biaxial stresses. Both have the same wavelength, independent of the initial stress. On the other hand, the wrinkle amplitude depends on the initial stress state, which is higher under an equi-biaxial stress than that under a uniaxial stress of the same magnitude.