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Biswajit Banerjee's blog

A disseration style worth emulating ?


... We do not assume any of those words make any kind of sense, though we do make certain assumptions about how much time the reader has on her hands and what kind of sense of humor she has.

I urge you to read the rest of the dissertation.

GPU Technology Conference 2015

This year's talks are now at

A large number of interesting talks from the 2014 conference can be found at

There is even one talk on structural mechanics in the 2014 conf.


-- Biswajit

Sampling data from large numerical simulations - part 2

The new blog post discusses yet another application of the Linear Assignment Problem; in this case the use of the Hungarian algorithm for finding an optimal list of close data points to a set of point generated using Latin Hypercube sampling.  See

-- Biswajit

Sampling data from large numerical simulations

Large numerical simulations lead to large data sets that typically need some sampling to make analysis tractable.  Check out my upcoming series of posts on the topic at

-- Biswajit

Please support "Theoretical and Applied Mechanics" at Stack Exchange

Hello everyone,

I've proposed a new Stack Exchange site called "Theoretical and Applied Mechanics" for people intersted in mechaics related issues.  The current link is

For the proposal to be accepted to go to the next stage the site will need the  following:

- 60 people to follow the site

Research notes: March 6, 2014

Earth science: Missing link in mantle dynamics

 Disclinations provide the missing mechanism for deforming olivine-rich rocks in the mantle


Mechanics journal impact factors 2012

Some funding agencies require that articles be published only in journals with impact factors greater than 1. Here's a list from 2012 that tells you which to choose (if you care about impact factors).
-- Biswajit


Abbreviated Journal Title
Impact Factor

Paper: On finding cohesive law parameters for foam-metal interfaces

A detailed report of our work on trying to find cohesive laws for interfacial fracture is attached.  I will add the experimental data after a shorter version of this report has been published.

The reason for posting this report on iMechanica is so that people who want to replicate the tests or perform similar tests know what is involved.  As we have found out, many details and potential problems faced by an experimentalist are hard to determine from the concise papers that are typically published as journal articles.

Please let me know if you have any questions.

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.

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


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

-- Biswajit

Nicolae Nicorovici 1944-2010



VALE Nicolae Nicorovici 1944-2010

11 February 2011

On proposals

Every year I try to get funding for things that I'm personally interested in but which may not have any immediate economic benefits.  A couple of years ago, after reading Penrose's "Road to Reality", I thought about applying Clifford algebra ideas to fracture mechanics and wrote up a proposal to that effect.  The proposal wasn't funded, but I think the idea is worth exploring.

The summary of the proposal was

From the literature

Naturally negative bulk modulus material.


Negative Linear Compressibility and Massive Anisotropic Thermal Expansion in Methanol Monohydrate

An introduction to metamaterials and waves in composites

My book on metamaterials, "An introduction to metamaterials and waves in composites" has been published on June 16, 2011 by CRC Press (Taylor and Francis).

The book is meant for students, researchers, engineers, and educators who want to get a basic grounding on the theory that is the basis of recent excitement about negative materials, cloaking, transformation optics/acoustics and other wave phenomena in composites.

Reliability and engineering mechanics

The word "failure" can mean different things to different people.  Over the past couple of years, my interactions with various groups from industry has shown me that for some people failure means catastropic fracture/buckling while for others it can mean highly localized plastic yielding.  Even for relatively simple sandwich composite structures, there is no clearly agreed upon definition of the word.

What do we do?

Yesterday, as I was waiting for the rain to stop before I could walk home from work, a stranger accosted me in the lobby of the building.  He asked me what I did, to which I replied "Mechanics".  He mulled over the answer for a bit and asked me to be more specific, at which point I said that we were trying to design materials that could guide waves around objects.  He said "Water waves?".  I replied "All types of waves."  Clearly, common words can mean quite different things to different people.


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