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Multi-scale nature of granular media
I am happy to announce the launching of our website for the computational geomechanics laboratory at Northwestern University. Please visit the site at
http://www.civil.northwestern.edu/people/andradesite/Geomechanics%20grou...
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Interesting research topic
Hi Jose,
Those pictures you show are very interesting subjects. Did you also observe the occurrence of particle rotation inside the shear band in laboratory ? Besides the works by Oda & Kazama (1998), Uesugi et al (1986,1988), do u also have other references about the occurrence of particle rotation inside the shear band either within granular body or very close to the interface between granular and continuum structure?
regards.
particle rotation
Hi Sendy,It is indeed the case that there is significant particle rotation inside shear bands. There have been both laboratory observations
Oda, M., Takemura, T. & Takahashi, M. (2004). Ge´otechnique 54, No. 8, 539–542
and numerical observations using DEM
J. P. Bardet and J. Proubet. A numerical investigation of the structure of persistent shear bands in granular media. Geotechnique, 41:599-613, 1991
Cheers,
Jose
Particle rotation in shear banding
This is an interesting research topic; the last research I had known about in this area was a series of 2-D DEM simulations in the thesis of Nabha Rege in 1996 (see here) which showed the formation of rotation cells when homogeneous strain effects were filtered.
Particle Rotation - Lesson from Nature
Thanks for the post. This is a very interesting topic. My group has discovered particle rotation in nacre. Below please find the paper and other related papers that may be of interest to you. Thank you!
Xiaodong Li, Zhi-Hui Xu, and Rizhi Wang, "In-situ Observation of Nanograin Rotation and Deformation in Nacre, " Nano Letters, 6 (2006) 2301-2304.
Xiaodong Li, "Nanoscale Structural and Mechanical Characterization of Natural Nanocomposites: Seashells, " JOM, 59 (3) (2007) 71-74.
Xiaodong Li, Wei-Che Chang, Yuh J. Chao, Rizhi Wang and Ming Chang, "Nanoscale Structural and Mechanical Characterization of a Natural Nanocomposite Material - the Shell of Red Abalone," Nano Letters, 4 (2004) 613-617.
Broken link
Cheers Jose.
Jose, I think the topic is
Jose, I think the topic is very interesting.
I want to ask a question about sand modeling. Computer graphics people work on modeling of sands for making movies or games.
What do you think about their models?
Thanks!