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Biswajit Banerjee's blog

Job wikis

Submitted by Biswajit Banerjee on

Those of you who are looking for academic jobs and have not heard back from the places that you applied may find the following wiki useful.

http://wikihost.org/wikis/academe/wiki/mechanical_engineering 

The idea is to let people know whether a position has been filled or not.  You can add the positions you have applied to, whether you have been called for an interview, whether references have been requested, or whether you have got a rejection letter.

Another "straightforward" calculation

Submitted by Biswajit Banerjee on

Following Andy's recommendation I have been reading Ellis Dill's Continuum Mechanics[1]. In page 75 of the book, we find the
well known result that the constitutive equation for an isotropic hypoelastic
material can be derived from a stored energy function only if



 

where and are the Lame constants.

Mechanical threshold stress model for 6061-T6 aluminum

Submitted by Biswajit Banerjee on

Our paper on the Mechanical threshold stress (MTS) model for 6061-T6 aluminum has been accepted by JoMMS.  There are several things of interest in the paper:

1) The use of a phonon drag model to predict the sharp increase in flow stress at strain rates above 10,000 /s.  This behavior is seen in a  number of materials and is hard to fit using standard power law plasticity models.  Our model does a good job in this regard.

Hypoelastic-plasticity with logarithmic spin

Submitted by Biswajit Banerjee on

In small strain elastoplasticity we start off with an additive decomposition of the total strain into elastic and plastic parts. In terms of strain rates we write



Prior to 1990 most large deformation plasticity algorithms extended this idea by postulating an additive decomposition of the Eulerian stretching tensor (rate of deformation):