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Prager's Hardening Rule

Hi all

I am currently investigating Prager hardening room which is stated as the simplist linear kinematic hardening rule. I was wondering if anyone has worked with this model and if so if you have managed to identify how to determine the constant used for the back stress equation


dα =C * dεp ( this is epsilon dot p which is the equivalent plastic strain)


Please can you let me know how to determine the constant C from experimental results? 

Maseng's picture

presenting a new method to model of metal foams

i have presented a new method for the first time to model of metal foams that subtracts stochastic cells from a desired volume and changes it to a foam.

i would like to know if there is any phd position for this?

thank u for your consideration :)

Lifeng Wang's picture

PhD Position Available in Multifunctional Composite Materials

One PhD position is available immediately in the Department of Mechanical Engineering at Stony Brook University, NY, US.  The research program focuses on the mechanics and multifunctional applications of 3D periodic composite materials including shape memory, acoustic/elastic wave propagation, and energy harvesting. The candidates with background in solid mechanics and finite element analysis are highly encouraged to apply. 

Ice failure simulation


  I want to simulate Ice failure simulation in abaqus. In my problem, ice is deposited between 2 components.

  While I am trying to move one compoents, the ice is restricting the movement of the components. Now I want to find out the force at which the ice starts to failure .

  any methods are available n abaqus., Plz let me know if any body knows abt this kind of simulation.


Thanks in advance


Viscoelastic & Viscoplastic Behaviour of flex printed circuit boards under bending loads


I am currently working on my M.Sc Thesis project of fatigue lifcycle of Flex printed circuit boards which is composite material of Polymer & Metal.Want some help who has worked on this topic which deals with Viscoelastic & Plastic behaviour of materials under action of pure bending loads.Help & Guidance would be appreciated.Need to come up with an equation which has stress & strain relating to lifecycle of Flex printed circuit boards.

Awaiting your reply,




homogenization on abaqus

Choose a channel featured in the header of iMechanica: 

I'm looking for how we can do homogenization on ABAQUS.
thank you in advance.

Je cherche comment nous pouvons faire homogénéisation sur ABAQUS.
merci à l'avance.

The Renaissance of Continuum Mechanics

Dear friends of IMechanica:


Primary data mining through Web of Science
reveals that the number of papers containing “continuum mechanics ” increases
rapidly these years. This is a very exciting fact to our mechanicians. Thus, I
wrote a short paper titled “The Renaissance of Continuum Mechanics”, which was just
published online via:


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

Choose a channel featured in the header of iMechanica: 


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.


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