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Free Online Mechanics of Materials Textbook

Submitted by Madhukar Vable on

I have posted the second edition of my book “Mechanics of Materials” online for free educational use. The book was reviewed and checked for accuracy by 30 faculty across the USA and was line edited by a professional editor.



The preface in the book describes the objectives and the design of the book, with details elaborated further in “Note to the Instructor”. The “Note to the Students” elaborates the many pedagogical features of the book. All these are in the file labeled “Table of content and front end material”.



USNCTAM 2010: Minisymposium on Mechanics of Crystalline Nanostructures

Submitted by Harold S. Park on

Horacio Espinosa and I welcome the submission of new abstracts for a minisymposium on "Mechanics of Crystalline Nanostructures", to be held at the 2010 US National Congress on Theoretical and Applied Mechanics (USNCTAM 2010), June 27-July 2 at Penn State University. 

softening, weakening and localization

Submitted by jingzheng on

Hello, everyone

I am a little confused about the discrimination between softening, weakening and localization.

In my opinion, softening is against hardening, corresponding to the decrease of slope in the hardening curve.

weakening is for what?

Localization is about localized plastic flow. 

localization is a phenomenon that explain the softening, so "localization" can not give help for better simulation result. Is that coreect?

 Thanks for correcting the views above!

Constitutuive modelling of viscoelastic materials

Submitted by bhargavasista on

I am currently working on constictutive modelling of soft biological tissues, considering them as nonlinear viscoelastic materials. I am using the split form of energy density function i.e modelling separately the hyperelastc part and the visoelastic part. I am using Ogden formula for hyperelastic part and for the viscoelastic part, I am currently using the second and third invariants of stretch rate tensor.

Relation Between Et(tangent Modules) & Es(secant Modules) in non linear elastic plastic theory?

Submitted by asit_rathod1 on

dear all

            is there any formaula or any theory by i can make a relation for the tangent and secent modules in the plastic region of the stress strain curve?....and also how to find Et and Es for the Alloy steel?.. if any body knows any thing than let me know soon..

warm regards

Asit Rathod

asit_rathod1 [at] yahoo.com (asit_rathod1[at]yahoo[dot]com)

Prestigious 5 year Fellowship -- RAEng/EPSRC Research Fellowships

Submitted by Stephane Bordas on

To all outstanding researchers with less than 3 years of post-doctoral experience, this is a unique opportunity to secure a 5 year post-doc.

This will be highly competitive, and applicants must be of world-class quality. 

Topics available in our group:

- multiscale (fracture) mechanics

- microstructurally-faithful modelling

- surgical simulation

- coupled moving boundary problems 

- meshfree methods 

- quantum simulations

For more details, please see below, and contact me at

Postdoctoral Associate position available at MIT

Submitted by Markus J. Buehler on

A postdoctoral associate position at MIT is available immediately, in the broad area of atomistic, molecular and multi-scale modeling of hierarchical biological, bioinspired and nanostructured materials. Material properties of specific interest include mechanical properties, in particular deformation and failure mechanisms. The work will emphasize on mutable properties (mechanomutability, thermomutability) and the analysis and design of adaptive, responsive, and robust materials through the integration of scales, from nano to macro. 



Stress invariants

Submitted by bruno-page on

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?

Anybody knows a molecular dynamics software for Windows operative systems?

Submitted by marco.paggi on

 

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