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Dispersion curve for Lamb waves using Abaqus

Dear all

I am trying to plot the dispersion curbve for wave propagation in an ALuminum beam under S0 and A0 lambwave.  My simulation has completed and I thin the results are reasonable as long as visualization is concerned.

I am trying to plot dispersion curve for these two waves using Abaqus outputs. As far as I know I need to use Abaqus outputs such as displacement or velocity for calculation of wave speed.

1- How would I calculate wave speed by Abaqus outputs and is this calculated wave speed the phase velocity or group velocity ?

selecting suface nodes in orphan mesh by python script????

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Hi,

    I have a 3D orphan mesh in abaqus and I need to select a group of nodes that belong to the orphan mesh and that would have been on a 3D surface of the parent solid before it was orphaned.

   I know how to do this in Abaqus/CAE, but I don't konw how to realize it using python scripts. If there is a method, just like using "findAt()" to select a surface by coordinates , to select all the nodes on a outer surface of the orphan mesh and to select all orphan elements?

Smoothed Particle Hydrodynamic (SPH) in ABAQUS

I've got problems using SPH (smoothed particle hydrodynamic), Is SPH
 analysis in ABAQUS coupled with heat transfer analysis??? I'm trying to
simulate Friction Stir Welding (FSW) with SPH Method, I need to predict
temperature  history during welding! Is there any software to do
this??? THANKS TO ALL

ali.asgari.tabari's picture

how to edit/correction mesh (in ansys workbench)?

Hi 

i want to analysis a model in anasys workbench with modal analysis.but i Encountered to problem.Bad mesh generation (as you see in the below figure) happened that i don know how to solve it,could anyone help me ?

 

Regards,Ali 

 

Difining Interior Surfaces in Abaqus

Hi,

Is that possible to define an INTERIOR surface in Abaqus???

Cutting process simulation in Abaqus

Hello ,

 I am working on a project using abaqus to
simulate miling process. As the first stage, I have to be able to simulate cutting process in Abaqus. I have looked up Abacus 6.11 documentaion a lot but did not find too much of usefull information. Could any one kindly give some hints how to develop such model or introduce me some usefull complete resources?

Regards,

Reza

material model for glass machining

Hello every body

I am working on the simulation of micromachining of “glass” in abaqus.
Although the glass is brittle, it shows some plasticity in micromachining
because of the high hydrostatic pressure field present in the machining region.
Now I am looking for an appropriate material model for glass with
elasto-plastic behavior which allows element deletion. I am not sure if "johnson-Holmquist damage model" is suitable for machining simualtion or not? I would be very thankful
if anyone would please help me.

ABAQUS

Hi Everyone

 I just started using ABAQUS. I was trying to plot a graph for stress vs
strain for a simple problem, plate with a hole. I could use some help
here. Really appreciate it if anyone could help me with the steps.

 Srinath

Anisotropic plasticity and hyperelasticity in Abaqus

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I am trying to model a polymer that has been processed in such a way that it has oriented (orthotropic) material properties and undergoes very high strains (>100%) before break.

ABAQUS physical memory problem.

Hi everyone.

I met a problem in ABAQUS. When I try to solve the same problem with implicit method and explicit method, theoretically, the explcit method requires less memory than implicit method, but for the same mesh density, I can not solve it with explicit method for the not enough physical memory problem, while the implicit method is able to solve it. And for the explicit method, how to edit the memory? How to explain this phenomenon?

Thanks. 

How to recover eigenvector components for specified displacements ?

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I have a problem visualising specified displacements from a modal/buckling analysis. 

When solving the algebraic system of equations [K]{u}={f} resulting from FEA discretization, the vector {u} does not have components for the specified displacements, zero or not zero, because the corresponding degrees of freedon (dof) have been eliminated. To visualize all the displacements, even the ones that are specified, we recover them from the input data to create a longer vector {u|u*} where {u} are the active dof and {u*} are the specified dof, zero or not zero. 

SIMULIA's picture

Upload Your Tutorial for a Chance to Win a 3Dconnexion Space Navigator Mouse!

5 Minutes, 100 Mb, but only THREE will win...

If you
have ever created a useful tutorial or if you have ever had a great idea for a
tutorial, but you’ve never had the time to create it - then now is your chance to share your
ideas with other SIMULIA users
! Beginning in May and ending in June
we will be accepting submissions of tech-tip tutorials. The winners will be
announced in August and will receive a 3Dconnexion Space Navigation Mouse.

Abaqus verification

Hello everyone
I have a question about Abaqus verification for a Mooney-Rivlin
hyperelastic material example which exist in ABAQUS Documentation/Abaqus
Verification Manual/2.2.1 Elastic materials/VIII. Hyperelasticity with
Mooney-Rivlin strain energy function. In the example for a Test data
input-uni axial tension the company Defined a stress-strain curve as
input for material property(Nominal stress-Nominal strain). But when I
plot these parameters(Stress -nominal strain) as output of the software

how to compute cavitation effect by ABAQUS

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hi

i need to simulate the "bulk" and "local" cavitation region around a structure in fluid subjected to underwater explosion.

maybe i need to calculate the negative pressure regions. but how?!

how can i define the condition and compute that cavitation effects by ABAQUS?

 

i appreciate your help

 

tnx

 

ya2010ser's picture

Subsea impact simulation with Abaqus

Hi every body

My thesis is about ship grounding. In this phenomenon, ship hit a rock. I can simulate this problem in Abaqus/Standard,without wave effect. But in reality there is water and waves. Can I simulate this problem with ABAQUS? Is it possible to define water(or wave) aruond ship and rock?

 

SIMULIA's picture

New SIMULIA Tech Brief: Cogging Torque Analysis of Permanent Magnet Machines using Abaqus/Standard

When designing a permanent magnet machine, one of the most fundamental and difficult goals is to reduce the cogging torque curve. The challenge in reducing the cogging torque is to also decrease the numerical noise generated by the mesh. Finite element analyses and the advanced meshing functionality that is available through Abaqus/CAE allows for a faster and more accurate prototype.

rajnishmallick's picture

Dynamic buckling

I am working on a dynamic post-buckling problem.

I wonder if it is possible to simulate dynamic post-buckling of a column with pinned-pinned boundary conditions with an time varying (sinusoidal) axial load in Abaqus.

Thanks.

Good day.

Best Regards,

Rajnish

PATRAN boundary conditions

Hi, 

I would ask if someone could help me. I'm trying to aplly rotational boundary conditions on a cylinder in MSC.Patran, could someone advice me how to do it? Thanks a lot 

 

Peter 

how to extract the story mass and story displacement in Abaqus?

hello, everybody 

    I've made a 3D multi-story frame and shear-wall model in Abaqus. So far, I wanna get the equivalent story mass, story stiffness and story modal displacement. how to extract the story mass and story displacement in Abaqus?   or how to make an equivalent multi-mass point system from original 3D multi-story model? 

Thanks in advance 

How to plot Fracture toughness vs Crack length in Abaqus for Delamination problem

I've modelled a DCB specimen and applied Boundary conditions and load... I followed the same procedures given in abaqus documentation... As expected the crack initiates and propagates along the interface... I can get the Resultant force vs displacement plot from the analysis.. But i dont know how to plot the fracture toughness vs crack length plot in ABAQUS..

Please help me... Your suggestion would really help me a lot..

BoJing Zhu's picture

One 3DLBM example: plastic creep simulation

A simple 3D D3Q27 lattice Boltzmann example for simulate the plastic creep simulation on the friction surface 

B.C for 3D simply supported beam in ansys with SOLID95 element

Hi,

I am modeling a 3D simply supported beam in ansys using a SOLID95
element. In this case, how should I give
the B.C.s? Should I apply B.C.s to

1) the mid nodes on the edge of beam? or

2) to the entire edge? or

3)  just to the bottom nodes?

according to me, I have tried to use the various B.C case, but the
results are very different even though the nodes number taken in account
change slightly, and for all case, the result is not satisfactory with
my analytical solution. plz help.

 Thanks in avance!

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