CERN scientists 'break the speed of light'
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?
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
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
Forums
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
International Conference on Fatigue Damage of Structural Materials IX 16-21 September 2012, Hyannis, MA, USA
Call for Papers - deadline 9 December 2011
Submit your abstract here: www.fatiguedamageconference.com
We welcome poster and abstract submissions on the following topics:
The surface effect on the strain energy release rate of buckling delamination in thin film–substrate systems
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,
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Thank you for the interest.