Biswajit Banerjee's blog
Fractal surface mesh generation
Saber El Arem (node/14053 ) wanted to know how a fractal surface mesh could be created.
I've had to do that in the past. What I did was to use Arjun Viswanathan's 1999 Matlab snippet on creating a plasma fractal and write a wrapper around it to create an output file that could be read by the then available version of Abaqus.
I've attached a couple of Matlab files that should be able to do the job. The .txt extensions are needed because iMechanica does not accept files with .m extensions.
Anisotropy and variability in polyurethane foams: experiments and modeling
Authors: B. Kraus, R. Das, B. Banerjee
Abstract:
ME/PhD Positions open: Fracture Simulation for Visual Effects
ME/PhD Positions open: Fracture Simulation for Visual Effects
High speed simulations of the fracture of wood, glass, concrete, brick walls, and many other materials are used every day in the visual
effects industry. The project team will develop the next generation of fracture effects technology, bringing visual effects fracturing to the next level through novel computational methods in conjunction with realistic material models for deformation and fracture.
11th Global Congress on Manufacturing and Management GCMM 2012
Dear Colleagues
This is a gentle reminder that the final date for submission of abstracts to the
11th Global Congress on Manufacturing and Management GCMM 2012
has been extended to 31 March 2012.
You are cordially invited to submit a paper and be a part of this event.
Spring stiffness of a helical spring
Once in a while I have to find the stiffness of a spring that I get from the local hardware shop. I usually use a formula that can be found in some books on mechanics of materials.
But the assumptions bother me a bit because the springs that I used usually underwent large deformations and I wasn't sure whether the numbers I was using were correct or not.
To check the formula I compared its predicted k to numbers from Abaqus simulations and found reasonably good results for many situations - but not for soft springs.
Notes on thermoplasticity
I've recently had the opportunity to take another look at plasticity in the large deformation context. I've avoided going into geometric and other issues involved with multiplicative deformations (points stressed in earlier blog posts by Giovanni (node/11545), Arash (node/11623) and Xiabo (node/11599). Attached are some old notes that I'd prepared some years ago to help me with the details. I hope they're of use to other students of mechanics.
-- Biswajit
A comparison of Ansys Shell181 and Solsh190 elements
Please find attached a report on a comparison between ANSYS SHELL181 and SOLSH190 elements with particular emphasis on applicability to linear elastic sandwich panels.
Title: Comparison of Ansys elements Shell181 and Solsh190
Abstract:
New computational mechanics page
Prof. Rebecca Brannon and her team have created a wonderful page containing interesting information on aspects of plasticity, damage, and computational mechanics (particularly, the Material Point Method).
Check it out at
http://csm.mech.utah.edu/content/
-- Biswajit
Nicolae Nicorovici 1944-2010
From http://sydney.edu.au/news/physics/1737.html?newsstoryid=6425
VALE Nicolae Nicorovici 1944-2010
By Professor Ross McPhedran
11 February 2011