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Inelasticity of Materials:An Engineering approch and practical guide by Arun Srinivasa

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Has anyone followed the book Inelasticity of Materials by Arun Srinivasa?

 I was interested in the way he used lumped parameter models to describe material behaviour in Chapter 3. Trying to follow his methodology I wanted to implement it for some experimental results I have.

 However, I have faced an obstacle in trying to work out the hardening modulus of the the material in question. He has worked it out for his example case by curve fitting but I am just not getting the answer.

Question about Smeared Crack models

Hi, I want to ask you guys about how to model an unconfined conrete material with smeared crack model in abaqus 6.10, especially about what kind of parameter should I use and how much the value of parameter. I would really appreciate if you could give me some tutorial, explanation, or even an example of how should I model a smeared crack model in abaqus.



How to give an Impact loading in ANSYS workbench static structural


Can any one know the way to give and impact force in  ANSYS workbench static structural ?


Distinguished Researcher to Speak at NJIT on Preventing Bone Loss

Biomedical researcher Stephen C. Cowin will describe a promising model for studying nutrient transport from the vascular system to bone tissue

modelling and analysing the laminated composites in ANSYS 14.5

I WANT TO find the flexural strength of laminated composites after it is subjected to cyclic loading

i have to use the output of the cyclic loading as the input to find the strength

i want to know the procedure for that

please help me out



MWR for the first- and third-order differential equations

Hi all,

In engineering sciences, we usually end up using either the second- or the fourth-order differential equations, and the MWR (the method of weighted residuals) works pretty well for them.

The question is: how about the first- and the third-order differential equations? Why don't we see any applications of MWR for these odd-ordered differential equations? What gives?


I have created a channel beam using 3D shell elements. It is subjected to two point loading each at 1/3rd length. I have performed STATIC RIKS analysis. Is it possible to draw bending moment diagram for this model? Orelse if i use section moments how can i interpret the maximum moment?

Your reply is highly appreciable.

Buckling analysis of a imperfection sensitive cylinderical shell under compression

I have carried out eigen buckling analysis of cylindrical shell under axial compression under unit load  using abaqus in model-1 and in model -2 i carried out riks analysis gave imperfection 0.2mm fotr shell thickness 2mm radius 0.25m,h=0.5 m after the 100 increment the the shell is subjected to load which is obtained from first buckling load in first mode  here how to get the collapse load


hi im prasath now im a CAE trainee. i want to know more about CAE analysis what are the necessary things i've to learn and experienced in this field?...


How to set the parameters of ductile damage in ABAQUS?


I want to try abaqus ductile damage model to simulate steel
failure in Abaqus. I read the manual, and have some ambiguities regarding its parameters.

 Is there somebody to have experiences in ductile damage to share?


Jizhou Song's picture

Caltech: secrets of the world’s number one university

Good International news on Caltech and engineering. Ares Rosakis, chair of the Division of Engineering and Applied Science,describes Caltech as “a unique species among universities…a very interesting phenomenon”.More can be found in the attachment or at the link below

low reynolds number flow over a capsule in fluent

I've been trying to simulate flow conditions at 100 km altitude over a re entry capsule in fluent.

Conditions are


Density = 0.000000577 Kg/m3

Pressure = 0.0289 N/m

I tried using laminar and k-w model. The solution does not converge even after 50000 iterations using the density based solver and ideal gas equation.

Is there a way to go about it?

Please let me know. 

Zhigang Suo's picture

Inglis (1913) vs. Griffith (1921)

I have updated my notes on the Griffith paper.  I added more description on the experimental determination of surface tension of solids.  Griiffith himself determined the surface tension of glass by an experimental setup.  Udin et al (1949) described a setup based on the same principle.  This setup is now known as the zero creep experiment.

Zhigang Suo's picture

The toughest hydrogel in the world

The class started today.  I'll be teaching fracture mechanics this semester.  I'll be mostly using the class notes I wrote in 2010, but will post updated ones. 

In today's class I covered "Trouble with linear elastic theory of strength."  I have just posted updated notes of the lecture.  The new notes begin with the follwoing paragraphs.

Intermediate Mechanics of Materials Online For Free Viewing

I recently posted a free, online, and
condensed version of my book Intermediate Mechanics of Materials, Second
Edition. It is posted on my  website
and can be used for reference or by self-learners. In addition to the
online book, there is a glossary of mechanics terms, brief reviews of
Statics, Matrix Algebra, Numerical Methods, and Mechanics of Materials.

Zhigang Suo's picture

Massvolume vs. Spacetime

Apples and oranges. Each element in a set is a pile containing some number of apples and some number of oranges.  Adding two piles means putting them together, resulting in a pile in the set. Multiplying a pile and a real number r means finding in the set a pile r times the amount.  We model each pile as a vector, and the set as a two-dimensional vector space over the field of real numbers.

Paul Calvert's picture

NMT Biomechanics Why is it better to be seaweed better than to be phytoplankton?

This is an introductory post to a discussion on the advantages of multicellular organisms over single-celled eukaryotes from an energy harvesting viewpoint.  It is intended for the New Mexico Tech biomechanics class but others can play.

As engineers we should seek for a numerical measure (or some measures) that allows us to decide how close an organism is to the optimum.  Consider two cases: a seaweed in comparison to a single-cell photosynthetic eukaryote and a herbivore in comparison to a single-celled eukaryotic animal.

Julian J. Rimoli's picture

Common questions about developing educational apps

This afternoon, I had an extremely pleasant Google hangout with Daniel Suo, and Professors Zhigang Suo and Teng Li . Our main focus was on brainstorming ideas on how to improve the user experience on iMechanica. After an hour or so our conversation drifted towards educational topics including novel ways of incorporating technology in STEM education.


can i include mechanisms while creating DMIG in FEA?

Vlado A. Lubarda's picture

Joining a discussion on Linear Algebra

I read with interest an excellent discussion about Linear Algebra in Mechanics. I am attaching Chapter I: Tensor Preliminaries from my book Elastoplasticity Theory, which includes Hill's analysis of induced tensors mentioned in the discussion.

kishore_cadcam's picture

Marine propellers

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How to consider a pretwisted tapered propeller balde either as beam orplate


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