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The use of IOSO Optimization and ABAQUS at Civil Structures of NPP (from ABAQUS Users' Conference)

At the stage of NPP civil structure design for determination of stress-strain state (SSS) at static and dynamic loading ABAQUS is widely used. Hereto the floor response spectra are determined for calculation of loadings on the equipment at special dynamic impacts (seismic, air shock wave, aircraft crash). In case if the obtained characteristics of SSS or spectral accelerations exceed maximum permissible values, designers take actions on strengthening the corresponding structural components.

Are Linear and Angular Momenta Interconvertible?

To the best of my knowledge, the two momentum conservation principles, namely, the conservation of linear- and angular-momentum, operate completely independent of each other. For an isolated object, there is no possibility of conversion of one form of momentum to the other.

Meshing a block with spherical void inside in Ansys

Free Tags: 

I have a squre block and inside it there is an sphere. I want to mesh
the whole assembly. I can mesh the sphere but when i try to mesh the
squre block with the spherical hole it cant mesh and says "it cant
select the source and target face". I also tried to devide it into 8
parts. That helped me to mesh the sphere but i cant mesh the squre with
spherical hole with that too. So please anyone can help me out.

Spectacular torsional-flexural autovibrations of a Volga bridge

The autovibrations of the bridge over Volga river in the city of Volgograd(Russia) were filmed (not by me) today on 05/21/2010. The amplitude reachedabout 1 m. The bridge opening was just six months ago...

Apparently, either the bridge frame drag was too high or torsional stiffness / damping too low.

Hyperelastic+ Damage with UMAT - Abaqus/Standard



 I have the following problem:

I want to implement a hyperelastic material model with a damage function (like the pseudo-elasticity of Ogden) by using a UMAT in Abaqus/Standard.

For this, in the first step I try to implement the damage of Ogden, which already exist in Abaqus/Standard.

But I don't know in which way I build the tangent stiffness matrix for this case (nonlinear and dependent of the history)

Do anywhere know a good literature in order to read and understand this issue?

Monte Carlo Simulation

Hello everyone,

I am new to probabilistic assessment methods of structures of various kinds, and I have encountered a paper which includes results of "Monte Carlo Simulation" and also fragility curves. Could someone please recommend to me some books, papers, or even links and sites from where I can learn more about this probabilistic method and for the derivation of fragility curves? My email is

Thank you very much in advance,

George Papazafeiropoulos

Displacement Controlled Geometric Nonlinear FEM

Hi I am working on numerical simulation of petroleum pipeline subjected to
seismic hazards. I have developed Geo-Nonlinear FEM code for load
controlled which i have compered with Ansys and it is working fine.
now i would like to apply fault  displacement for this i need to
convert my code to displacement controlled using penalty approach
but it is not converging. i will be very happy if any one can suggest
how i can over come this problem or plz sugest me some book or papre. here I am using Newton-Raphson method 


3D Doctor Tool



I hope this is the right forum to get some help for my work. 

I am looking at CT data (DICOM files) to make FEM models. To generate 3D surface/volumes for FEM, I was looking for softwares. They all are pretty expensive (4-10K USD). I have decide togo with Able Software's 3D-DOCTOR. I am lookign for some reviews or user experience or comments for this tool.




SOS.Do anyone have this paper?

I have looked for the paper "FASTRAN-II [microform] : a fatigue crack growth structural analysis program / J.C. Newman, Jr" for a long time ,but until now ,I have not found it.Is there anyone so kind to help me ??

Thanks a lot .

8th International Conference on Fatigue Damage of Structural Materials - Author Registration Deadline: 1 June

Don't forget! Accepted oral and poster presenters should register no later than 1 June 2010 to ensure that their material is included in the final program and the book of abstracts.  Non-registered presentations will be withdrawn from the conference after this date.  Please include your abstract reference number when completing your registration form.

FEM simulation on damage of brittle materials with Abaqus on mesoscale

Choose a channel featured in the header of iMechanica: 

Hi, Smile

I'm a fresher in abaqus. Now I'm trying to simulate the damage of brittle kind of materials, like concrete with abaqus on mesoscale. But there are some problems now...

Shuozhi Xu's picture

The potential for Vanadium in molecular dynamic simulation

One of the most significant factors in molecular dynamic simulatin is to choose the proper potential. Recently, I did some searching jobs on Vanadium (V) potential and finally decided which potential I am going to use. Here is a simple summary:
A brief introduction of EAM, F-S and MEAM potentials for BCC transition metals

Structural thermal analysis in ANSYS

How can we perform first structural and then thermal analysis in ANSYS (version 12) ? All the examples show the sequence the other way. I can't go for Direct coupled method as the materials are elastic-plastic (plasticity is not supported by direct coupling elements).

How to use small cracks theory to solve fatigue problems???

I  really need help with it .Anyone can help me . Thanks a lot . 

Multiscale simulation in particular quasi-continuum or bridging domain methods and fracture

We are interested in making contact with self-motivated candidates with significant experience in multiscale simulation, if possible with a Physics or Mathematics background for projects involving the simulation of multiscale fracture. Researchers with experience in ab initio models are particularly encouraged to make contact.

Please contact stephane dot bordas at gmail dot COM for more detail.

 Thank you


FEM simulation on damage of brittle materials with Abaqus on mesoscale

Hi, Smile

I'm a fresher in abaqus. Now I'm trying to simulate the damage of brittle kind of materials, like concrete with abaqus on mesoscale. But there are some problems now...

Mike Ciavarella's picture

Some example videos of my new YouTube channel course "Mechanics of Materials" (italian)

Given the success of my facebook course Mechanics of Materials MMCM see here, we had so many videos and photos, that I suggested the students to create a Youtube channel.   Here it is, with many videos based on powerpoint presentations I had from my course, and that of collegues in Torino (Masssimo Rossetto), or some conferences presentations, which the students transformed into videos.  Thanks in particular to Mariella Greco, and Simone Legari.

Wanted: Fast FEA Solvers...


I am thinking of informally conducting a specific case-study concerning the FEA solvers. The reference problem is a very simple but typical problem from stress analysis, leading of course to the linear systems: Ax = b and Ax = Lx.

I seek advice as to what software libraries currently available in the public domain would be best to use---the ones that would be fastest in terms of execution time for the reference problem.

I have a personal and longer-term research interest with certain issues related to the solvers technologies.

WANGXU's picture

Some problems in the paper:" Haversian cortical bone model with many radial microcraks: An elastic analytic solution".

Dear all,

I have read the paper titled Haversian cortical bone model with many radial microcraks: An elastic analytic solution. My problems and the paper are attached.I hope you can see the problems and the corresponding paper. Thanks for your help.

Sincerely yours,

Xu Wang

Postdoctoral Position in Computational Mechanics

A postdoctoral fellowship is available in the Duke Computational Mechanics Laboratory, beginning in September of 2010 (with flexibility on timing).  Funding for the fellowship concerns research in the simulation of dynamic fracture of polycarbonate.  The ideal candidate will have experience in some combination of the following areas (in no particular order of importance):

Crystal Plasticity- overview

I read this article today, perhaps other beginners like me can also get some benefit from this:


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