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CERN scientists 'break the speed of light'

Submitted by Rui He on

Scientists said on Thursday they recorded particles travelling faster than light - a finding that could overturn one of Einstein's fundamental laws of the universe.

Antonio Ereditato, spokesman for the international group of researchers, said that measurements taken over three years showed neutrinos pumped from CERN near Geneva to Gran Sasso in Italy had arrived 60 nanoseconds quicker than light would have done.

is there any proper model for the fatigue crack tip stress-strain field?

Submitted by Chen Long on

dear my friends:

 I am a new one in the fatigue crack study. as we all konw, there is a crack resistant near the crack tip before its cracking. HRR model has been well testfied in monotanic crack, so i wonder whether it can be expanded to the cyclic crack situation or not! if yes, so how to describe the stress-strain distribution just nearby the tip? can we define a similar resistant value in the cyclic status?and is the stress redistribution concept right for the stress harden material?

any suggestions would be appreciated!

regards, Long

Call for Papers - SIMULIA Customer Conference 2012

Submitted by Twebb83 on

The international SIMULIA Customer Conference (SCC2012) will be held May 15-17, 2012 in Providence RI, USA. Abstracts for papers are due November 7, 2011.



All users of SIMULIA products including Abaqus FEA, Multiphysics, Isight and Simulation Lifecycle Management (SLM) are invited to submit an abstract.



Elastic failure criterion

Submitted by HussamNasreddin on

Dear all,

I would like to define an elastic material with a
failure value of maximum tensile strain only. Any element reaches a max.
tensile strain value will crack and suffer complete loss of load
carrying capacity(possibly delete that element). Thus its a change in
geometry that is only considered when redistributing stresses.

 Could this be done in ABAQUS or any other Finite Element Software?...I have been working with ABAQUS for some time now but I could not reach any where

 

Thanks for the help

Hussam 

The surface effect on the strain energy release rate of buckling delamination in thin film–substrate systems

Submitted by tongqing.lu on

Gurtin–Murdoch continuum surface elasticity model is employed to study the buckling

delamination of ultra thin film–substrate system. The effects of surface deformation and

residual stress on the large deflection of ultra thin film are considered in analysis. A

concept of effective bending rigidity (EBR) for ultra thin plate is proposed on the basis of

Gurtin–Murdoch continuum theory and the principle of minimum potential energy. The

governing equations with EBR are formally consistent with the classical plate theory,

One postdoctoral position in advanced concrete materials starting May 2012

Submitted by Mijia Yang on

Dear All,

I am looking for one postdoctor to work on advanced concrete materials and modeling. The desired candidates will have a solid knowledge on concrete materials and mechanics, and are familiar with advanced modeling of hydration, water or chemical transfer in concrete. Extra considerations will be given to candidates with some experimental experiences on concrete microstructures and material characterization.