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modeling corroded pipe with Abaqus

Submitted by badr on
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Fracture Mechanics Forum
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Hello everyone,

 I'm doing a 3D modelingcorroded pipe.  The results is differant from the Analytical solution (modified N31G mathod).  Abaqus results is actualy half of the analytical solution.

I need some help whith:

1-  Half of the pipe was modeld so, how should i constrain the pipe? I constrained it as in the attached picture.

2- How can i know how much load was applyed?

3- how can i magnifiy teh displacment?

 

Thank you,

Badr

 

 

 

Help regarding 2D co-rotational beam formulation

Submitted by yawlou on
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beams
co-rotational

I have implemented a 2D co-rotational truss formulation in matlab.  I get identical results to OpenSEES.

Now I'm trying to implement a 2D co-rotational beam formulation.  I have followed the simple formulation in Crisfield's book volume 1.  It seems like this should be a fairly straight forward extension of the truss formulation.  I have rederived everything Crisfield has done and obtained the same results, yet something is still incorrect.

Phonon Dispersion Relations from MD simulation

Submitted by drogers on
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Computational Mechanics Forum
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molecular dynamics
phonon
dispersion

How does one calculate the phonon dispersion relations from the output of a molecular dynamics simuation? 

I have successfully calculated the complete phonon density of states using a fourier transform of the velocity autocorrelation function, but I am still confused as to how to calculate the particular phonon dispersion curves.

Thank you.

Strain gradient plasticity: the flow rule of Fleck and Hutchinson violates thermodynamics ?

Submitted by Mike Ciavarella on
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thermodynamics
strain gradient plasticity

A recent paper on JMPS has seriously questioned the foundation of the SGP theory of Fleck and Hutchinson.  The matter is not simple, but is it a good bench test for imechanica to discuss?

doi:10.1016/j.jmps.2008.12.002    

Self-consistent Modeling of plastic and viscoplastic polycrystalline materials

Submitted by T.ZENG on
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Self-consistent
viscoplastic
polycrystalline

I am a freshman of researching the macro response of  metals with micromechanics scheme. Now,I have to build a  self-consistent modeling of plastic and viscoplastic for polycrystalline materials. However, it seems difficult for me as I have little knowledge of polycrystalline and its mechanics propertities.

If you know some systematic books or papers about my research area. please let me know. Your kindness will be great appreciated!!!

What yield criterion must I use?

Submitted by hafonso on
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Nowadays I am analyzing a study of a hip prosthesis including the bone. I am making the FEA/FEM analysis by Pro/Mechanica software. Metallics materials are titanium alloy (Ti-6Al-4V) and Chromium-cobalt-molybdenum alloy (CoCr29Mo). So they are ductile materials. I understand the main load is the flexural load on the hip.

Compressive strength/failure test on brick

Submitted by Kenneth Lo on
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failure

Hi everyone. I'm new to this forum and quite new with FEA.

Currently i'm trying to find compressive strength or maximum failure stress on a modeled brick. Is't possible? What parameters or properties do i need in hand in order to proceed?

Regards,
KenLo

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