This is a very fundmantal question.
What is the physical significance of stress invariants?
I understand that the stress invariant J2 of the deviatoric stress tensor is used to ecpress the yield criteria-but this is same as Von Mises yield criteria-I want to know what is so special about-stess invariants?
I understand that these invariants remain unaltered by rotation/transformation of the axis-is this the only reason for being so special or there i any other reason as well?
Dear All,
I am looking for a freeware molecular dynamics software working for Windows operative systems.
I have tried LAMMPS, but it seems to me that it works only under UNIX.
Thank you very much in advance for any information.
Best wishes, Marco Paggi
Dr. Ing. Marco Paggi, Ph.D.
Assistant Professor of Structural Mechanics
Alexander von Humboldt Research Fellow 2010-2011
Member of the Executive Board of the Italian Group of Fracture 2009-2011
A post-doc position is available now for one who has recently obtained (or about to get) his/her PhD on computational
geomechanics or computational mechanics. The successful candidate is expected to have strong background of mechanics
and extensive experience on computer programming (e.g., coding in FEM and/or DEM), and is able to work independently.
He/she who has previously worked on multi-scale modeling of material behavior will be particularly welcome to apply. The
initial contract is one year and is extendable to multiple years subject to his/her performance and availability of funding.
The geometric factor for mode I stress intensity factor for a finite strip under pure tensile loading is reported in Tada handbook as F(a/h) = 1.122 - 0.231(a/h) + 10.55*(a/h)^2 - 21.71*(a/h)^3 + 30.382*(a/h)^4 , but in the existing literature, I could not find such geometric factor for mode II stress intensity factor for a finite strip under under pure shear loading. Does anyone know such geometric factor for mode II stress intensity factor for a finite strip under under pure shear loading, if it is reported in the existing literature? or, if it is available in any unpublished sources?
On Aug 10, 2009, Semiconductor International (SI) Newsbreak published a report on my work in AMD about 3D fracture study of underfill delamination as the top story in that issue. I have never imagined that. Except the pleasure I received from this good news, I wonder if this work is also interesting to iMechanica community. For that reason, I attach here the SI news report and the original paper published on ITherm2008 Proceedings. Welcome any comments and thoughts.
Description
Applications are invited for graduate studies within the Micro and Nano Mechanics Laboratory in the Department of Mechanical Engineering, Northwestern University. The successful candidate will join a vibrant interdisciplinary research group and be involved in projects addressing atomic scale experimentation and modeling of advanced materials. We seek motivated, talented and independent individuals interested in pursuing a PhD in one of the following areas:
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Description
Applications are invited for a research assistant position within the Micro and Nano Mechanics Laboratory in the Department of Mechanical Engineering, Northwestern University. The successful candidate will join a vibrant interdisciplinary research group and be involved in projects addressing multiscale experimentation and modeling of advanced materials. We seek a motivated, talented and independent individual interested in conducting research on the characterization of material instabilities and failure.
