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Multiple cracks in ansys

One way of modelling multiple cracks in Ansys.

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enthalpy use

respected sir/madam

                              i have probla, how we put temp. depent. enthalpy valu in material type

modelling of rectangular composite plates using ANSYS

I have to analyse the carbon/epoxy composite laminate in ANSYS,  to determine the natural frequency of rectangular composite plates. The plate is simply supported . I  am not able to model the composite lay up with the correct orientation of the fibre. so any body have the step by step procedure for modelling the composite lay up in ANSYS and how to determine natural frequencies  please give it to me on my e-mail:

Two-point Tensors

I am confused about the use of two-point tensors in elasticity. The deformation tensor F and first PK tensor are two point tensors, and the "two-point" property arises from use of two different Coordinate System When a continuum body is deformed, why it is necessary to move the Coordinate System as well? (or alternatively, why the coordinate system is attached to the body itself??, isn't it possible to use a general coordinate system which can represent the deformations and also account for the rigid body rotations of the continuum body?).

free vibration mode shapes of beam (other than pinned-pinned) and finite strip method

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Hi everyone.

I'm working on my master thesis, dynamic analysis of plates using finite strip method.

I have found one problem (among others) that could be interesting to community.

In the attachment you can find example from Mathematica. There is 21 mode shapes of clamped-clamped beam. Recently i noticed that formulation given in every book about dynamics (Timoshenko, for example) isn't valid for higher modes for any beam that isn't pinned on both ends.

GOPALAERO2000's picture

Effect of surface hardness in tensile testing

Hi Everyone,

 Is is possible to account the surface hardness effect in the tensile testing specimen? If possible, how could it be acomplished?

For instance, I would like to establish the  stress strain curve for the material that used on surface hardened component. Will there be a big change if the surface hardness effect is considered on the tensile specimen?


Please throw some light in this regard.



M Gopalakrishnan

Muthukumar M's picture

How do find Inverse to Rectangular Matrix?

Dear All,

How do find the inverse of the rectangular matrix.

Fracture mechanics of concrete

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Do you have any class note regards fracture mechnaics of concrete or general fracture mechanics notes


Thank you

Rajdeep P Rajput's picture


I want to what exactly entropy means???I know the definition and formula but still not getting the physical significance.When we say temperature we can understand and feel it.But,in case of entropy each time I read about it I don't get it.Can anybody explore it's significance in easy way so that i can understand what exactly entropy means?

Zhigang Suo's picture

Lectures on Soft Active Materials, 2nd edition

In May 2008, I posted 3 lectures on Soft Active Materials given at UCSB.  I have since given similar lectures on other occasions, but never all three at the same place.  The field has been active.  The lectures have been updated with new items.  I’m now posting the “2nd edition” of these lectures.

  • Dielectric elastomers
  • Neutral gels
  • Polyelectrolyte gels
  • pH-sensitive gels 

The slides are posted as delivered.  No effort is made to eliminate repeating slides. 

Books for finite element method for implant and bone

Hi there,

I am new to Finite element method. I would like to know if their are any books for implants, bones and their interaction.

Thank you for your consideration.


Rabindra K. Patel's picture

Modeling of viscoelastic material in ANSYS

Any one can tell about the modelling of viscoelastic materials in ANSYS. In the modeeling how material properties can be given. Like I have material data in the form of Prony series parameter. If sone is having relaxation data how can that be fed to ANSYS model?




Hello all

plese if any one have informations about the crack propagation, using ansys package

hows we can using ansys to simulate th crack prpoagation with time.

i have aprobem

wait for u


hiader k. mahbes's picture

Plasticity and elasticity questions

 Dear AllI has question about these stresses.1.Are deviatoric stress generate plastic deformation?2. Are hydrostatic stress generate plastic deformation?3.What is the advantage of transferring strain tenser orientation to the principle coordinate axes? 4. What is the difference between rupture and fracture stress?

Surface Based Cohesive Behavior

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Can anyone explain what is actually surface based cohesive behavior (definition and explanation).Abaqus manual doesnot explain it properly.

Modelling a composite wall in ANSYS


I am doing a Non-linear Buckling Analysis of a composite wall

I am having hard time modelling the composite wall

The composite wall consists of polystyrene foam as the core element and stucco is applied on either side of the wall.

 There is a thin sheet of mesh embedded in the stucco ( please see the attachment for clear visualization).

Boundary Conditions:Uniform compressive load is applied at the top surface and the bottom surface is fixed

what to calculate: Critical Buckling Load, Critical Buckling Stress 


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Extended finite element analysis tutorial in ABAQUS


 I am a new learner of XFEM. I want to start some exmaples in ABAQUS. The tutorial in ABAQUS is rather crude. If any body has experience, May I have small notes on how to solve problems with XFEM in ABAQUS?

Thank you for your help.




PhD thesis Evaluation


one of my students is working on PhD topic " Study of cold hole expansion and evaluation of fatigue properties on critical aerospace components". His work has to be reviewed by professor of non indian origin in foreign universities. I request you to kindly help this student. If you are interested, let me know, so that I will ask my university to contact you in this regard.



rbatra's picture

Breakdown of structural models for zigzag single wall carbon nanotubes

The following article shows that the linear elasticity theory does
not predict well inextensional modes of vibration of a single-wall
zig-zag tube.

 Gupta, S.S., Bosco, F.  and 
Batra, R. C. (2009) Breakdown of structural models for vibrations of
single-wall zigzag carbon nanotubes, J.
Applied Physics,


Brittle Failure damaging material model in Abaqus

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Hello everybody i m working on a project Fem erosion analysis of brittle ceramic material using Abaqus/Explicit . I know for brittle material especially Jhonson Holmquist model is best suited , but unfortunately its not available in abaqus . So finally i decided to go  with brittle cracking criteria . Can Anybody helpme to use this criteria of brittle cracking

I need parameter of this criteria like

1 .Brittle Cracking >> Type GFI>>1 . Failure Stress 2. Mode I fracture energy

Finite elements based on shell theories

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Recently I faced two questions in course that I am attending:


1) Outline the salient features of different higher order shell theories.


2)Explain why some shell theories are not suitable as the basis of element formulation.


3) Discuss any limitations of elements being used in relation to their underlying formulation ( e.g use of shallow shell theory or cylindrical shell theory).


Jayadeep U. B.'s picture

"Classics" in iMechanica

Dear all,

While reading some "old" discussions in iMechanica, I have come across
a blog by Zhigang to have a collection of "classics" in iMechanica. 
Immediately, I searched for such a section, but couldn't locate it.  Is
it ever made?  If not, why not start it now?  I am sure there will be
many juniors like me, who are eager to read those classics.

composite modelling in abaqus

I have to analyse the jute epoxy composite laminate in abaqus 6.9. to determine interlaminar toughness of the frp plate. i am not able to model the composite lay up with the correct orientation of the fibre. so any body have the step by step procedure for modelling the composite lay up in abaqus please give it to me.

asit_rathod1's picture

Finding Books

Hi all

I want to Find Books For Non Linear Stress- Strain Curve,which Gives more Idea About the Plastic Region,and terms of Tangent modules(E_t) nad secant modules(E_s)...plz do needful and Reply...

Yours faithfully




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