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. 

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. 

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we will be accepting submissions of tech-tip tutorials. The winners will be
announced in August and will receive a 3Dconnexion Space Navigation Mouse.

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
the result shows a significant difference between Input data and out put
data,and I don't know why?!
Any comment about this will be highly appreciable
this is the input file which I'm discussing about:
*HEADING

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

What do
Guitar Strings Have to do With Dynamic Response?

Tightening
guitar strings to change the sound uses the same principle as tightening head
bolts to change the dynamic response of an engine block assembly. This is
stress stiffening and it affects the dynamic response of a structure. One of
the fundamental components in assessing nonlinear static stress is stress
stiffening, but it is also the most overlooked when evaluating the steady-state
dynamic response of engine assemblies.

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?

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.

Click here to learn how the Cogging Torque Analysis of Permanent Magnet Machines using Abaqus/Standard can be used to analyze reduction of cogging torque through meshing.

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.

Good day.

Best Regards,

Rajnish

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 

hello, everybody 

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..

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

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!

 Van

Dear all,

        I am running a abaqus job to simulate the failure mechanism of a pile-foundation system. The material used is mohr-coulomb soil. I found that if I use multiple cpus for the calculation, I got different results each time (at the step which does not converge). However, If I just use single cpu, there is no such kind of problem, each time I got the same results.

         Anyone else has this experiences before? I am quite confused.

 Zheng Li

Hello All,

I have a question regarding Ansys solution divergence in nonlinear static analysis, with geometry and material nonlinearities. In this case the model is shell but that should ba valid for bricks as well.

hello,

as title says, does anyone knows how to fix a limit to the time that an abaqus job takes to be calculated.

this is because i am running several jobs sequentially, and i want to set that for instance if some job takes too much time, just stop it and go to the next one.

thank you a lot. 

A discrete damage mechanics (DDM) model is now available as a UGENS/UMAT implementation for Abaqus/standard. This is an analytic constitutive model for laminates composites, based on discrete fracture mechanics. It is capable of predicting matrix crack initiation and crack density evolution using just two parameters--the critical energy release rates (ERR) in opening mode I and shear mode II. A methodology is available to determine those (invariant) material properties from experiments. 

hi.

Im modeling a composite with hashin damage.

but I dont know what to insert to the hashin damage

requirements .for example I dont know what to insert to the

 fiber tensile strength or   fiber compressive strength and so on. please help me

I want to design a simple geometry of the mitral valve. But I do not know how to design. Can you help me?

Just found a new sotware called LAMMPSFE, which has graphic interface and can generate lammps input script. 

https://www.scifes.com/index.php/product   

Hello,

 I am new to the FSI interaction module in abaqus, i wanted to know how to go for it, as i have modelled structure embedded in the soil domain using abaqus standard /explicit model and on which i have to model fluid striking the structure as well as the soil layer i have to use only Abaqus CFD model , iam not sure how could i model fluid in the CFD model what kind of interaction in between abaqus standard and abaqus cfd model and how could i make interaction, also how to install FSI module in abaqus cae?? it's knid of surge water striking structure!!

Thanks 

Hello All:

I am running a simple thermal tension coupon test with two steps.

Step 1: Apply a 10 lbs load on the coupon at certain temp.
Step 2: Keep the strain constant and reduce temp ( the material would
try to contract but I must keep the strain constant by increasing load)

Is there a way for me to do step 2 in abaqus and have it predict the load or stress required to maintain constant strain?

I would appreciate your comments? Thanks

Hi,

I´m analizing the modes of a structure but I don´t know how to plot the different modes (I only see the first one). I´m using  Adina 8.7.3.

Thank you very much!