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Material Parameter Calibration for Johnson Cook

Hi all ... Is there a way to find/calibrate material parameters for johnson and cook material model using experimental data in Abaqus? .. As far as i know abaqus has something called as data editor with which Hyperelastic materials models can be calibrated with experimental results. If not is there any other way arround to do calibration of material parameter with abaqus.

Geometric nonlinearity

hi all,

How to decide the geometric nonlinearity?.

i.e If i consider a sturcutre for example-fishing rod or wind turbine blade, how to decide that the structure is geometrically nonlinear.

Does it requires lots of calculations or by experimentation... For example by just observing the structure, is it possible to decide?

What are the reasons to consider the geometric nonliearities.



Modelling water in Abaqus


Is anybody able to provide me with a step by step guide of how to model water as a material in Abaqus.


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Multiphysics Capabilities of ADINA

ADINA offers a comprehensive array of multiphysics capabilities tightly integrated in one program:

* Fluid-structure interaction (FSI)
* Thermo-mechanical coupling (TMC)
* Structural-pore pressure coupling (porous media)
* Thermal-fluid-structural coupling
* Electric field-structural coupling (piezoelectric)
* Thermal-electrical coupling (Joule heating)
* Acoustic fluid-structural coupling
* Fluid flow-mass transfer coupling

Elasto-Plastic Analysis of metal component with Cyclic Loading



I am pursuing my master's in Mech. Engg. and working on Abaqus for FEA of components. In one of the analysis, 

I am required to apply cyclic loading on the component to determine the Stresses at the edges. Its a compression

cyclic loading with kinematic hardening taken into account. From the documentation for ABAQUS 6.9.1, I found that

in order to apply kinematic hardening in metals, one must take it as Combined (Isotropic + Kinematic) Hardening.


The two concerns I have about this analysis are:

Solving nonlinear equilibrium problem

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I am trying to solve (for equilibrium points) a geometrically nonlinear problem of the form

f(u) = F

where u is the displacement and F is the load. At first I tried the plain

Newton method, with, perhaps obviously, limited success. I then tried to use

linesearch and trustregion strategies to improve the situation. Eventually, however,

I realized that I needed to use some form of continuation method. Though the most

commonly used methods in mechanics seems to be based on gradually increasing the




Micro-sphere Model

Hi all,

I am currently working on micro-sphere model like the one used by Miehe, Ihlemann and Pawleski. I wonder if someone know a FEM code who use this type of model.

Thanks a lot

Joachim Guilie


how to model a 3-D crack in ansys

i want to create a crack in a cantilever beam, but i m new in this field. please tell me how to model a crack in beam when beam is meshed using 1) beam elements 2) solid elements?

please refer any good tutorials in this field.


FSI Analysis to Understand Carpal Tunnel Syndrome

1. We present an interesting application of ADINA FSI in the study of carpal tunnel syndrome. The analyses involve large deformations and contact of multiple flexible bodies which are immersed in a fluid:

2. Please recall that we offer a very attractive academic package, for research and teaching, for university users. For more information see

Geometric Nonlinear Finite Element Program

    I'm programming a finite element program to analyze the force of submarine pipeline.When the pipeline is lifted highly from seabed,it is a large deformation problem.

    Is there any open soure  to solve the problem?

    Give me some advices.

    Thanks a lot!

Survey on XFEM: is XFEM good at characterizing Failure rather than Fracture?

Would like to hear your expertise/user/non-expert/sceptic comments on XFEM. Here are some of the challenges. Would like to hear your relections.

1. Can XFEM be utilized in characterizing Failure rather than Fracture?

2. What sort of challenges XFEM still have with respect to Fracture Mechanics?

3. How the Fracture mechanics benefit the industry, from the perspective of strcutural integrity?

4. Failue investigations vs. Fracture investigations: benefit to industry?

5. Academist vs Engineer: Perspective on XFEM

Water Content In Exhaust Gas (Diesel Fuel)

Hi everyone,

I would like to know if anyone would be able to help me calculate(or measure) accurately the Moisture Content / Water vapour content in the Exhaust Gas of an Engine.

I wish to determine the components of the Exhaust Gas for a Combustion Chamber(so that I am able to calculate the Gas Constant of the Exhaust Gas) and

 I have been able to measure the values of Oxygen(in %), Carbon di oxide(in %), Carbon monoxide(in PPM), NOx (in PPM).

The components that I am taking into account for the Gas Constant calculation are O2, CO2, N2 and H2O.

Crack length in fracture mechanics


I have modeled a beam with a hole in it in ABAQUS. I use of FRACTURE MECHANICS and FINITE ELEMENT METHOD for perdiction of failure load of beams with holes. I am wondering is it a correct assumption to assume a fixed crack length for one beam with varying hole position or not? 

It have assumed that a fixed crack length for a beam with varying location of hole along the beam.

Am I correct?

Thank you,


Stiffness of a beam


As a part of my research, I would like to break down a simply supported beam to two beams shown in the attachement.  I expect to remove the bond and use of springs for transforming deformation of upper beam to lower beam. What could be the stiffness of springs which could be used in new model?

Thank you for your comment,



Operations with sparse matrices

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Dear mechanicians,

Stiffness matrix from ANSYS Classic

I want to get stiffnes matrix from ANSYS Classic. I used substructure analysis and using list->other-> super element data and got stiffness matrix of whole structure. But I want to get stiffness matrix of individual elements. Can I do it in ANSYS Classic?


notch tip radius

Hello everyone,


I am looking for a way to measure notch tip radius experimentally. Would you give me some ideas about that? is there any relationship between  morphology of notched cracked body surface and notch tip radius?

 Thank you and Regards, 

Nonlinear deformation analysis of CNTs with higher order Cauchy-Born rule based constitutive model


   Recently, we have developed a so-called higher order Cauchy-Born rule based
   constitutive model for the analysis of large deformation of CNTs [1]. It is
   a generalized quasi-continuum model for nano-structures.


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