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help me


i m b.e. iv year student  and i do project on fracture behaviour of joints using ansys. and i have just basic knowledge of ansys so plz provide me sufficient information.


i will be very grateful to you.   

Zhigang Suo's picture

Mechanics of Soft Active Materials

At the invitation of David Clarke on behalf of the UCSB/Los Alamos Institute of Multiscale Materials and Structures, I gave the following three lectures:

  1. Large deformation and instability in dielectric elastomers
  2. Large deformation and instability in swelling polymeric gels
  3. Mechanics and electrochemistry of polyelectrolyte gels

The abstracts follow, and the slides are attached at the end of this post.

Rotating Beams/Frequencies/Errors/Abaqus input file attached

Im trying to model a rotating uniform beam for 12 rotational speeds in Abaqus using c3d20 elements. As expected, "step 1 to step 5" the frequencies increase as the rotational speed is increased. However, for some strange reason, the frequencies stop varying from the fifth speed. I do get warning messages when running the input file but i cant intepret them well since Im new to Abaqus.

I believe the problem is elementary but i cant figure it out. Can anyone review or run the attached input file to let me know what I  am not doing or what exactly is wrong.

Many thanks.


Scaling of fracture strength, fracture energy and toughness is an important issue when it comes to predicting the behaviour of large-scale structures on the basis of laboratory scale measurements. Historically the work of Leonardo da Vinci and Gallileo is well known, followed by the statistical weakest link theory derived by Weibull in 1939. Weibull scaling is a statistical approach assuming instantaneous failure when the weakest link in a material structure fails.

how to apply cyclic loading in ABAQUS (for determing the DEFORMATION MODULUS from PLATE LOADING TEST down a DRILL HOLE

hi to all,

this is srinivas from IITROORKEE presently doing M.Tech in CIVIL Engg .

my project is

determing the deformation modulus using plate loading test down a drill hole.


Journal paper

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Hi every one,

    Iam searching for the paper 

    "  charalambides P.G. ,J. Lund, A.G. Evans and R.M. McMeeking(1989),  A test Specimen for determing fracture resistance of     bimaterial interfaces . Journal of Applied mechanics, volume :56, pages 77-82. "

     Iam unable to find this paper. I need this paper for my thesis work. Is there any one find this copy please attach the copy.

Modeling DCB Specimen using Ansys to determine Energy Release Rate



         Iam working on ansys modelling of DCB specimen to determine the energy release rate. Ihave modeled a CT specimen and determined its SIF. Is it right way to model the DCB by changing the dimensions of CT specimen and making it a DCB specimen?..

How can i find out energy release rate of the specimen?

Iam pretty new to Ansys


Problem is using static/riks option

I have some problem in defining the material properties using UMAT. I want to simulate the cubic stress-strain traction-sepration law. Solution doesn't converge after max load is applied (i.e zero slope of stress-strain plot). I am using riks solver. I have written my stress -strain relationship as below in UMAT file. Please tell me how to converge the solution even after zero slope of stress-strain relationship. Can i make my load factor(lambda) negative in riks option.


Mahdi Kazemzadeh's picture


This is a great news for all students here in iMechanica! The formation of a study group which will focus on the basic concepts and the facts of daily research, the simple tools that any of us will need at a certain stage. Please see blow the formation of this idea and add your comment, it would be good to know other points of view as we can improve the initial idea step by step.

Carl T. Herakovich's picture

Berger on Video Solutions for Teaching Mechanics

Professor Ed Berger, Univeristy of Virginia Mechanical Engineering, is featured in the Chronicle of Higher Education for his use of web technologies and, in particular, "video solutions" for teaching undergraduate mechanics courses. See  Or contact Berger at  Ed hasn't used this approach for all undergraduate mechanics courses as yet, but the potential is there. 

cbrinson's picture

New Book on Polymers and Viscoelasticity

I wish to inform the imechanica community about my recent book,  Polymer Engineering Science and Viscoelasticity, Springer, 2008. THe book starts at the beginning and contains both the physics of polymers and the mathematics of viscoelasticity. It is also unique in the history of mechanics in being the (first ever?) father-daughter book. Those interested in polymer mechanics may find this a useful resource! It may be found in your library or further information can be found here

New Graduate Textbook on Micromechanics and Nanomechanics

World Scientific Pub. Co. will soon (2008 Winter) publish a new graduate textbook on Micromechanics and Nanomechanics.  The book is based on a lecture notes that have been used in Berkeley for seven years. Reading of book requires minimum knowledge of continuum mechanics and mathematics, and the book is intended for the first year graduate students as well as those practitioners who have no time to read the literature for self-study.

Is the limit of stress intensity factors "1" when the crack length is close to "0"?

I have read some papers about fracture mechanics of functionally graded materials. I find there are different results for the stress intensity factors when the crack length is close to "0" . In some papers the values of stress intensity factors are "1" when the crack length is close to "0" , but in other papers the values of stress intensity factors are not "1". I obtain the stress intensity factors is "1" when the length of crack is close to "0". I hope to get the explaination about the results.Thanks a lot.


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As far as I understand from the previous blogs: we can now embed XFEM in ABAQUS. Is this approach restricted to linear elastic behavior? Can we simulate fracture propagation in an elasto-plastic material ("XFEM coupled with ABAQUS" type analysis) or is this approach only limited to fracture propagation in elastic materials.



FEM Analysis of Composite plate girder Bridge

hello friend,

my self jignesh patel, give some guide about the construction stage analysis of composite section.How to appy live load (movind load) in Construcion stage Analysis.

plz reply me if know abt the content.


Power Hardening

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Hi all!

I am trying to simulate the tensile test in ABAQUS. Could you please tell me how I can incorporate the power hardening stree strain relation in ABAQUS?

Thanks in adavnce


thermal analysis

What are the good books to refer for thermal analysis with practical applications.

What is the meaning and advantage of“ isoparametric element” in FEM?

Does the FEM software( ANSYS,abaques,et al) ues the isoparametric element  concept?

 Thanks for your reply。

problem in full transient analysis

hi friends

i have problem in full transient analysis in ANSYS 11.0

kindly give me solution.

i have data .....


lenth=144 inch 

area=120 sq inch 

moment of inrtia=1000 inch rest to four

depth=10 inch

elastic modulas=3605 kips per sq inch

density of material=8.6805E-5  kips per cubic inch

FOR SOLUTION..(force 23.8 kips is linearly decreases from time = 0 to 0.042 at centre of the beam)

at time = 0 sec , force = -23.8 kips

Basic information about Plasticity

Does anyone know of a simple book, approximately 50 pages or so, for plasticity?. I am looking for something that is similar to Morton Gurtin's "Topics in Finite Elasticty" published by SIAM. This book is an uncluttered treatment of finite deformation elasticity and was very useful for me during graduate work. I am NOT looking for 200-300 page texts, becasue I will never get around to reading them.



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