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Federico Bertoli's picture

Finite elements method monograph (spanish)

Finnally I graduated in Aeronautics Engineering!

Yoy can find a monograph I made during Aeronautics Structures III about FEM in



PS: It is in Spanish, english translation will be available soon.

meshless methods

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good morning sir,
i am masthan rao ,doing final in of engineering specilisation is mechanical,i want to do my projcet on meshless methods.sir plese send the total information about meshless email id is
thanking you sir,
yours faithfully,
p.masthan rao

Basic ABAQUS questions

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I am a novice ABAQUS user.  I've found out that I'm more comfortable using ABAQUS/Standard than the CAE version. The GUI is installled on a central server, thus it is slow, doesn't render images very well and keeps on crashing. I have some questions, which I guess are pretty straight forward for advanced users:

ABAQUS/CAE - How can I model a two-storey shear frame with rigid floors and LUMPED masses?

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This would seem like a simple task. Anyhow, I am having some trouble.

 Problem description: I want to model a two-storey shear frame with rigid floors and lumped masses? I.e., in all its simplicity, a two-DOF system ignoring the mass of the columns and lumping the mass at the two rigid floor beams. A typical example in all books on structural dynamics.

 The columns are modelled with B23-elements while the floors are chosen as analytically rigid parts. I have used 'special - intertia - point masses' to simulate the lumped mass at the reference point of the floors.

How to open .iam or .ipt files in Ansys v11.0?


I have a problem when i try to open .iam or .ipt file in Ansys. The message are:


PlugIn Error: Geometry Interface not found.

PlugIn Error: Attach failed.

By the way, I'm new with Ansys. Perhaps someone can teach me.Thank you.

Neuber Stress Correction method in Detail(Using FE Results)

Hi All,

 Can please explain in detail, Using the Linear Elastic FE Results how can we get the Elasto plastic Stress ( Using the neuber Stress Correction method).??

Thanks in advance,



duplex slip

Hi, can anyone tell me if it is possible for duplex slip of two diferent systems  result in one single slip direction?


problem with meshing

hi friend

   iam new to ABAQUS and 
i am modeling a sample plate in Abaqus with a crack and partitioning the
region at crack tip, but im getting an error such as "24 elements are
within a contour region. The elements are identified in element set

Iam also attaching the   file that i have modelled. please anybody help me in solving the problem

ABAQUS - i need help to define my boundary condition/loads etc. Please help.

Hi All,

 I'm really new on abaqus and currently having tremendous problem with it. Could anyone help with it? I'm trying to simulate a thin sheet clamped by rigid jaws and moves it onto designated position. Could anyone advice me on how to its boundary condition and so on.. ANy advice is welcomed. I'm really2 desperate.

Thanks in advance,


N. Sukumar's picture

PUFE homework exercise

As a follow-up to the discussion here, I am attaching a PUFE homework that I have assigned in 2006 and 2008 when I have offered a meshfree/pufe course. This might be of some help to those who have an interest in partition-of-unity enriched finite element methods.

GDQ method


 I want to know about GDQ method.

Can everybody help me please?

Bset regards



nonlinear buckling of plates

hi all,

   thanks lot, actually how to solve nonlinear buckling analysis?

1.what is the adavantage of nonlinear analysis,will u get new critical load or same value of linear buckling load? of the imechanica member suggested the follwing code,i done using tha t code but what ever im giving time value same value getting after converging my solution.

Here is the code that I used to perform the analysis:

abaqus warnings

Hi Dear all


hi all,

      im doing structures,i ve doubt abt nonlinear buckling of perforated plate subjected to uniform compresssion load.i diddn't get exact buckling load load in nonlinear analysis,my problem is how to load vs displacement curve.plz help me.

            thank u

What is the Difference betweeen Stress and Pressure?


Stress is the property of the body under loads. It is defined as a sort of reaction produced by the molecules of the body under some action which tends to produce some deformation. this intensity of these additional forces produced per unit area is known as stress.



Pressure is defined as force per unit area applied to an object in a direction perpendicular to the surface.



Is it fine?

whenever I justify with these terminology people doesnot satisfy with these answer, they always what else 

decomposition of fourth-order tensor

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Is it possible to decompose a 4th-order tensor Dijkl with minor symmetry (i.e., Dijkl=Djikl=Dijlk) into Dijkl=AijBkl? And does Dijkl have its polar decomposition form like a 2-order tensor ? Welcome to discuss this question.

Thermal resistance

How can i prove that the thermal resistance in a sphere ( Biot number >> 1 ) mainly determans the speed of the heat transfer. Hope somebody can help me with this problem



I am intrested in Process piping design and saw an institude in India  called IPEBS based in HYDERABAD  that offers such courses. I would like to know if this institude is a good one. Other recomendations are welcome.

Thanks for your information.


ABAQUS model for special joint element and spring element

Very urgent two enquires:

1. How to model rotational spring element in order to define a curve
like M=k*(theta) where theta is the rotaional angle? It seems that
abaqus could only provide F=kx model.


2. there is a dashpot connector element which behaves like F=C * V
(where C is a constant), can I ask how to model F=C*(dv/dt)=C*a(where a
is the derivative of change of velocity)?


simulation of compact tension tests

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I am a student and I need to simulate compact tension test so as to obtain the fracture toughness using ABAQUS. I would have to compare the fracture toughness value from ABAQUS with values obtained from experiment.

I have been trying to model the compact tension test for weeks without sucess. Can anyone give me the step by step description of how to model the compact tension test

Thank you 


 im doin my final yr proj on composite shell......actually my structure involve a single layerd and a bidirectional fiber orientation...

But i felt really tough in solving usin ANSYS..i started my proceedings with some approximations ie) i hav used modelling->layup option with an assumption of 0.5 mm thick layer of 0 deg orientation....nd remaining 0.5mm thick layer of 90 deg orientation...

Bending stress of a "T" collored tube kind of structure

Hi everyone,

I am a under graduate (B.E-Mechanical) student carrying out project for my curriculam.

In this project I was alloted to study the strength of collered tube kind of product. In this product I have to study the stress at fillet region (Please refer the attached presentation) and suggest the required section improvement.

According to my knowledge, fillet region would undergo two kind of stresses

1. Normal stress (stress due to axial load and bending stress due to moment arm from the fixed end)

shell 181 for polymer composites

hi guys,

         can anyone tell me whether a semi rigid PVC foam  can be analysed by taking shell 181 material and if possible please provide me with details regarding the layer configuration of this material type.


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