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Speech of Acceptance of the 2010 Timoshenko Medal by Wolfgang G. Knauss

files/knauss-w72_2.jpgIn the following the italicized portions were stricken from the oral presentation to better approximate the time length suggested. They are retained here primarily for the preservation of historical developments in mechanics.

Experimental Mechanics of History

How to determine crack length in XFEM analysis

Hi guys,

i am doing crack propagation analysis using XFEM. My model is working fine. i want to know how one can determine the length of the propagated crack against time increment. Is there any built in histroy out put variable with which one can calculate the length of the propagated crack using histroy output or is there any other way for example using pyton scripting. would be my pleasure to hear valuable comments from you guys. 


Can microscopic coefficients always be derived from macroscopic coefficient (biot effective coefficient, skempton coefficient)?

Can microscopic coefficients always be derived from macroscopic coefficient?

To be more specific, 

alpha: Biot-Willis coefficient, Skempton coefficient 

These two parameters are derived from the macroscopic level which reflects the response of a porous material as a whole, without explicitly taking into account the individual contribution of its solid and fluid constituents.

From microscopic level, there are parameters (or bulk modulus) such as Ks (solid grain bulk modulus), Kf (fluid bulk modulus), and porosity. 

Arash_Yavari's picture

Effect of External Normal and Parallel Electric Fields on 180^o Ferroelectric Domain Walls in PbTiO3

We impose uniform electric fields both parallel and normal to 180^o ferroelectric domain walls in PbTiO3 and obtain the equilibrium structures using the method of anharmonic lattice statics. In addition to Ti-centered and Pb-centered perfect domain walls, we also consider Ti-centered domain walls with oxygen vacancies. We observe that electric field can increase the thickness of the domain wall considerably. We also observe that increasing the magnitude of electric field we reach a critical electric field E^c; for E > E^c there is no local equilibrium configuration.

mpeleehp's picture

Research Fellow/Research Assistant positions for mechanism design/vibration analysis of actuators for 10 Tbits/square HD Drives

Our group has two research openings for people with expertise on mechanism design / dynamic and vibration analysis of actuators cater to 10 Tbits/square inch hard disk drives. Please send your cv to me at or Prof Ong CJ at

Markus J. Buehler's picture

Faculty Position in the Department of Civil & Environmental Engineering at MIT

Massachusetts Institute of Technology

Faculty Position in the Department of Civil & Environmental Engineering

The Department of Civil and Environmental Engineering invites applications for a faculty
position to begin September 2011. We will consider exceptional candidates in all areas
of civil and environmental engineering who can contribute to the mission of the
Department in advancing knowledge of built and natural systems.

tmelsayed's picture

Postdoctoral Fellow Position in Computational Mechanics -- Accepting Applications until Position is Filled

Job description
A Postdoctoral Fellow position is available in the Computational Solid Mechanics Laboratory
(CSML) in the Division of Physical Sciences and Engineering at King Abdullah University of
Science and Technology (KAUST). Candidates with experience in one or more of the following
research areas are encouraged to apply:
(1) Constitutive modeling of materials (metals, biological tissues, polymers, gels, soft active
materials, …etc.)

pleu's picture

Graduate Student and Postdoc opening

The Laboratory for Advanced Materials at Pittsburgh has openings for
one graduate student and one postdoctoral research fellow for 2011.
Interested applicants should send their materials to Professor Paul W.
Leu at

------Graduate Students Openings------

stefanogonella's picture

USNCCM-11 Minisymposium on Computational Methods for Multiscale and Multiphysics Wave Phenomena

Dear colleagues,

I would like to draw your attention to the minisymposium:

Computational Methods for Multiscale and Multiphysics Wave Phenomena

Markus J. Buehler's picture

Postdoc position at MIT available immediately

We have several open postdoc positions, to be filled immediately.

The first project is focused on thermal management. The project involves the computational and theoretical analysis of graphene/graphite-metal nanocomposites and experimental work carried out by other team members. We are looking for a strong person with background in thermal and mechanical properties of materials, preferrably with background in molecular simulation.

Michael A. McCarthy's picture

Seeking postdoctoral researcher - Molecular Dynamics of CNT-nanocomposites

The Irish Research Council ( has a funding scheme for postdoctoral researchers. I am seeking someone to submit an application to IRCSET to obtain funding to work within my group, in Modelling of CNT-based nanocomposites. The chances of success are high for candidates with a good research record. The deadline for applications is December 8th.

Intermediate Mechanics of Materials - 2nd Edition

Springer has just published the second edition of my book
`Intermediate Mechanics of Materials'. The book covers a selection of topics appropriate to a second course in mechanics of materials. Many books with titles like 'Advanced Mechanics of Materials' are pitched at a much higher level than most introductory courses and this can present a significant barrier to undergraduate students. My intention in this book is to make this transition smoother by discussing simple examples before introducing general principles and by restricting the mathematical level to topics that can be treated using ordinary differential equations rather than PDEs.

Kejie Zhao's picture

Inelastic hosts as electrodes for high-capacity lithium-ion batteries

Silicon can host a large amount of lithium, making it a promising electrode for high-capacity lithium-ion batteries.  Upon absorbing lithium, silicon swells several times its volume; the deformation often induces large stresses and pulverizes silicon.

phunguyen's picture

Looking for a postdoctoral position in the field of (solid) computational mechanics


My name is Nguyen Vinh Phu, a PhD student at Delft University of Technology, the Netherlands. I have been working with Prof. Bert Sluys on a project named "Coarse graining of failure in heterogeneous solids" since July 2007. I am finishing my work and therefore seeking for a postdoctoral position starting after July 2011.

My expertise in computational solid mechanics includes

(1) Finite elements, extended finite elements and meshless methods.

benzerga's picture

Faculty Position in Aerospace Materials at Texas A&M

The Departement of Aerospace Engineering at Texas A&M University
is seeking to fill two positions this year. One position is in the area of
aerospace materials. Details about the position and the application process may be found in the attached file.

Open Postdoctoral Position in In-situ Transmission Electron Microscopy at MIT

Open Postdoctoral Position in In-situ Transmission Electron Microscopy

Department of Materials Science and Engineering, MIT


Postodoctoral position in multiphase flow in porous media, University of Texas at Austin

The postdoctoral researcher will develop three-dimensional, network-like
models for fluid displacement in low permeability porous media. Such
porous materials involve multiple relevant length scales (e.g. micro-fractures
connected to the adjacent matrix) and models to date are not representative.

Ashfaq Adnan's picture

USNCCM-11 Minisymposium on Multiscale Transport Phenomena in Biological and Biomedical System

Dear Colleagues:

Wing Kam Liu and I (Ashfaq Adnan) would like to invite you to submit abstract(s) to the following mini-symposium at the upcoming 11th U.S. National Congress on Computational Mechanics ( The congress is scheduled to be held on July 25-29, 2011 in Minneapolis, Minnesota, USA.

Strain stiffening induced by molecular motors in active crosslinked biopolymer networks

We have studied the elastic response of actin networks with both compliant and rigid crosslinks by modeling molecular motors as force dipoles. Our finite element simulations show that for compliant crosslinkers such as filamin A, the network can be stiffened by two orders of magnitude while stiffening achieved with incompliant linkers such as scruin is significantly smaller, typically a factor of two, in excellent agreement with recent experiments.



一、招聘条件     获得知名大学力学或相关学科博士学位;发表过多篇高水平学术论文;有较强的团队合作能力及宽阔的学术视野; 


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