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Erkan Oterkus's picture

First Book on Peridynamics is Available

                                                         Peridynamic Theory and Its Applications


                                                              Erdogan Madenci & Erkan Oterkus


Dibakar Datta's picture

FREE Registration : School on Molecular Dynamics for Biomolecules and Nanomaterials


Dr. Axel Kohlmeyer , one of the LAMMPS code developers, is organizing FREE School on Molecular Dynamics for Biomolecules and Nanomaterials at Temple University, Philadelphia (August 18th - 22nd, 2014)

 Detail Schedule is Available Here 

VUMAT of Drucker Prager, help needed please..

Hi Everyone,

                    I have written Drucker Prager in VUMAT version as shown below..but still there are some deviation with the original in built version of ABAQUS. I have all the notes how i derived these equation.could you please show me where the code has gone wrong or have i missed a critical point in here..i tried my best to spot the error but could not..may be you all experts could find it. Thank you very much. 


subroutine vumat(

c Read only -

     1  nblock, ndir, nshr, nstatev, nfieldv, nprops, lanneal,

piezometric head

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Hello together,

my professor just failed me in an oral exam. It was shwn a graph of a piezometric headline that increased. I said that its because of an increase of the diameter of the tube. He said afterwards:

jenda_z's picture

Modeling of Localized Inelastic Deformation 2014

Dear colleagues,

I would like to bring to your attention the advanced course on Modeling of localized inelastic deformation that will be taught by Milan Jirasek in Prague, Czech Republic on 15-19 September 2014. More detailed information on the course is posted at We are looking forward to seeing you in Prague!

iberinsk's picture

Scholarship available!

We are happy to announce an individual scholarship opportunities for international students for studying in International Master Degree Programme Advanced Dynamics of Discrete and Continuum Systems of Saint Petersburg State Polytechnical University.

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Nominal vs. net strength

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I have difficulty accepting the definition of "nominal strength" and "net strength" given in Shigley's Mechanical Engineering Design.

Consider a plate of width w, thickness t, with a hole of diameter d centered at w/2, loaded with force F.  

Shigley's says: the "net stress" is \sigma_net=F/(wt) and the "nominal stress" is \sigma_nominal=F/((w-d)t). ==> I think he is wrong!

According to:


— noun

iberinsk's picture

New educational program: MSc Advanced Dynamics of Discrete and Continuum Systems

St. Petersburg State Polytechnic University (Russia) opens a new MSc program in mechanics and mathematical modelling. The program is designed for training highly professional scientists and engineers with the theoretical background and practical experience in theoretical mechanics, computational mechanics, IT, mathematical modelling and simulations, and distributed computing.

Bridgman and tensile test

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Dear all I came up with some stress distributions which exist in a cylindrical specimen in a tensile test. However, I cannot understand how these formulas were gotten. There is a reference to a Bridgman paper (1944). Is there anyone who can give some inputs abouts this?


Thanks in advance 

Shiva Rudraraju's picture


Taxonomy upgrade extras: 
Shiva Rudraraju's picture


Taxonomy upgrade extras: 
Shiva Rudraraju's picture

University of Michigan Continuum Physics and FEM lectures available online


Open.Michigan is a University of Michigan initiative that enables faculty, students, and others to share their educational resources and research with the global learning community. As part of this, Continuum Physics and Finite Element Method lectures offered by Prof. Krishna Garikipati are now available online on youtube and

Workshop on Microfluidics : Nanofluidics : Multiscale CFD, Registration deadline extended

Please join us for a national workshop on Microfluidics and Nanofluidics near Delhi, India during 14-16 July 2014. We are happy to have some higly accomplished academician in multiscale CFD domain. Prof. Suman Chakraborty, Bhatnagar Awardee 2013 will be principal instructor and speaker in the event.

Novice ABAQUS user seeking advice on damaged plasticity reinforced concrete model


am an ABAQUS novice working on a graduation project.  My model is a
reinforced concrete Tee-joint with steel rebars and stirrups embedded to the
concrete.  The concrete is modeled using the Damage-Plasticity model, with
mostly default suggested values.  The elastic and plastic values are
derived from experimental values.  In addition to the embeddment, the
column and the beam is tied together using the tie command.  The model is
subjected to an axial load as well as a displacement force. 

New introductory course in structural mechanics opens on edX

2.01x: Elements of Structures is a new introductory course in structural mechanics that just started on edX. Anybody can  register  to audit the course for free. 

Course material includes lecture videos, tutorials, example problems, recitation problems with video walkthrough, homework problems, "boardnotes" (condensed lecture notes) and synoptic tables.

Homogenization - If materials in the model are isotropic, is it possible to get truly anisotropic resulting material?


I read that "In general, even if the materials on the micro-level are isotropic, the effective 

material can show anisotropic behavior. A general anisotropic linear elastic material 

may have twenty one independent material parameters.''


If I understand my results correctly then simple structures like ''ball in the unit cell'' result in orthotropic material.

I am a bit puzzled - what would be the simplest structure that would result in anisotropic material behaviour?

What is mandel stress?

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Free Tags: 

 Dear all,

 Sometimes, we can see the conception of Mandel Stress, I wonder

What is mandel stress? How to use it?


Wenbin Yu's picture

Please recommend a good mechanics of material book

I am teaching mechanics of materials to sophomore. However, our students do not have a separate static course. They get a some exposure to free body diagrams in particle dynamics. I am currently using the book by Gere and Goodno. But I found that both the teaching and learning experience were not good. Thanks a lot in advance for your suggestions!



Free Elementary Differential Equations and Real Analysis Textbooks by William F. Trench

The following  items can  be downloaded  free of  charge from  Digital.Commons@Trinity:


previously published by  Brooks/Cole  Thomson Learning, 2000,


Picture frame shear test

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 I'm trying to simulate a picture frame shear test using ABAQUS and I have landed up with some problems for which I haven't been able to find any solution from almost a week. Any help would be much appreciated!

So, here's the problem:

Boundary Conditions

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