Hi,

I'm doing an Optimization in Abaqus by using a generic Algorithm. This is implemented by a Python-Script which varies some parameter, submitts the job and at last get's some fitness-value out of the .odb file. This works very good but after some time and generations (which is not always the same) the System crashes and the error message:

"GUI detected error while waiting for ipc connection to close. ABAQUS
Error: ABAQUS/CAE kernel exited with an error" occurs.

I'm running Abaqus 6.9.3 on a Windows 7 operating system. 

Does anyone have some experience with this kind of error and has perhaps some suggestion to solve this problem?

Thank you

Hi there,

 Recently I have modelled a 2D block of soil, at the first step of analysis the soil block subjected to a gravitational load (Gravity) and gravitational stresses generated in the soil block, at the second step, a little rectangular part of soil block removed and currently a concrete block with same size of removed soil embedded on the soil block. this concrete block to be subjected a surface loading.

but the problem is that when i remove the rectangular part of soil, and embed the concrete block instead, I see some space between concrete block and soil and i dont want this.

to solve this problem what should i do?

you can download my abaqus file using the link below :

Hi all,
I am trying to run a VUMAT subroutine for isotropic hardeining, whenever I input the command "abaqus j=inp_name user=subroutine_name " the analysis begins, the ODB file is generated but in few secs the analysis exits with an error, and the error is..

Abaqus Error: The executable C:\ABAQUS\6.7-1\exec\explicit.exe
aborted with system error code 5.

It also says...

How can one install pngwriter with MinGW and Code::Blocks?

Also can anyone suggest some easy visualization library/tools for C++ that can be useful for simulation.

Where I can find the subroutine of a user material Fortran code for Viscoelastic constitutive model?

Can anyone help me?

Hello everyone,

 I have a problem with one user subroutine.

The fact is that, debugging the subroutine I see the totaltime different from the steptime. I am using just one step and the .inp implementation is veryfied with a different user subroutine, so totaltime and steptime should be exactly the same (but they are not...)

The value of the total time is around 1e-8 and the value of the steptime is around 1e-55.

Could anyone give me a clue?

Thanks in advance.

Hi Expert,

 I'm a newer of Abaqus. I was trying to compute a simple compression problem using Mohr-Coulomb model. I found the slope of stress-strain curve from the results is double of that defined in the input file. I don't know what's cause it or my understand of the slope is wrong.

Only one 8 node C3D8 element is involved. To simplify the question, let the friction angle be 0, it reduces to a Tresca model actually. The material is defined as:

*ELASTIC, TYPE=ISOTROPIC
 3.350000E+07, 2.000000E-01,
*MOHR COULOMB
 0.,0.
*MOHR COULOMB HARDENING
 10000.,0.
 3360000.,1.

The hardening slope defined above is 3.35E+6.

Dear Friends

Does anybody know how can I add following boundary condition in Fluent software for outlet of an internal flow ? Is there any easy way without needing UDF or etc.

Where p is pressure, Re is Reynolds number and vn is the velocoty component normal to the outlet section.

PLZ.......

Hi, I'm Pietro, a short term Italian incoming student at VT (virginia tech).

My advisor, in order to start my thesis there about skin friction coefficients in a scramjet combustion chamber, gave me a Modal analysis to do on a gage described as follow:

a cantilever beam  (1mm diameter and 3cm long cylindrical shape) with 1mm depth and 1cm diameter cylindrical flat "hat" attached upon.

Base constraints: zero displacements, zero rotation

On the top is applied a costant, mono direction wall shear stress of 200 Pa, so a 0.0157 N of wall shear force (but i don't think it needs for modal analysis).

Dear All,

 I have the following problem: I'm doing a time history analysis of box-shaped reinforced concrete shear wall. It has four faces, each face consisting of about 400 shell elements. I'm interested in the maximum shear strain that occurs during the whole time history analysis. I'm running this analysis on ABAQUS/Standard and input the time history of accelerations from a file which has a total time of 10.6s @ 0.0018s interval. Apparently, my analysis creates around 6000 frames in one step, corresponding to time history analysis. I would like to plot the maximum shear strain in all the elements on each face.

Dear Colleagues,

Following our recent article on this new method, we are making our Matlab routines available. The package contains standard DIC, SSDIC, plus a few extras. More info here

I am trying to simulate the long term behaviour of the PBT (polybutyelene terephtalate) thermoplastic.

The mesh and initial stress distribution data (after ejection from the mold) were exported from Moldflow commercial program as Abaqus input (*inp) file. By default, I have already got a fist step of the simulation (linear elastic properties of polymer). What I actually need now is to simulate the long-term performance (for example in the interval of hundreds or thousands hours).  It means that the real time scale is of the utmost importance for the analysis.

Hi All,

 I want to model post-tensioning tendons embedded with concrete structure. Both ends of tendons are anchored. Can anyone inform me what kind of element most suitable to model the tendons and concrete structure in ABAQUS? I tried solid part for both items, yet as the tendon diameter is very small if compared to the concrete dimension, the resulting number of mesh on the concrete structure is very large.

I generate a box-like concrete and use the cut extrusion function in ABAQUS to create the ducts at which the tendons are to be located in the Assembly module. The diameter of duct is equal to the diameter of tendon, hence small instances are seeded at the edge of duct end before generating mesh.  

I have a problem modelling electrical conduction in Ansys. I started with a 2D model where two current excitation sources are applied (one positive and the other negative). I use the potential difference at two opposite points to determine the resistance based on potential drop technique with a square electrode configuration. The problem is that electrical resistance is a reciprocal function of plate thickness, which means that it gets bigger as the plate thickness is reduced. But Ansys gives one number for the electrical resistance and I'm having a hard time comparing it to the theoretical value.

In 3D, I keep getting a resistance that is twice as big as theory predicts. I'd appreciate any assistance.

Hello,

Dear Colleagues, 

Our company, the leader provider of Global Optimization Software based on unique Optimization technology IOSO, regularly takes the opportunity to test their software on well-known, special and in-house benchmarks. With the help of famous scientists using our software, our partner companies and our representatives as well as our customers we are ready to show that IOSO is capable to solve various types of optimization tasks coming from various sources. 

For those of you looking for FSI simulation on Abaqus platform, recently Simulia has announced the new features in release 6.10, which introduces the capability for performing Computational Fluid Dynamics (CFD) simulation.
So it enables users to perform coupled physics simulations with
Abaqus/Standard and Abaqus/Explicit, such as fluid-structure
interaction between human tissue, a medical device, and fluid flow, more information:

http://www.simulia.com/news/pr_100524_DSS.html

how to take interaction for acoustic -structural interaction in Abaqus software...  I am going to do frequency analysis, plz help 

Folks,

I'm embarking on a project to build a modified copy of a DIY 3D printer.  See http://reprap.org/wiki/WebHome to get a rough idea.  In my case, I have my own lathe and milling machine, so I can fabricate more substantial components, e.g., by machining aluminum.  I also have larger stepper motors, some 3/8" precision rod and linear bearings that I can use. 

 The goal is to design a 3D gantry that will sweep roughly an 8" cube and mount alternate tool heads, e.g., a lightweight  plastic extruder, as well as heavier and higher vibration machining heads (~Dremel motor).  I would like to design the gantry to minimize static and vibrational deflection, while minimizing weight.

Hi,

I am evaluating a couple of software packages for impact and destructive testing simulation.

What are the strength and weakness of the following packages in terms of explicit solver capability for impact/destructive?

NX Nastran non-linear (with explicit solver)

NEi Nastran explicit

ANSYS explicit solver (new in ANSYS 12)

Thanks!

phsieh2005

Hi all,

I want to solve one second order nonlinear partial differential equation. Please see attachment for PDE. 

any FEM solver is avilable to solve this PDE.

thanks in advance.

Alok

Hi All,

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).

Hi all!

 
I'm using Matlab and mupad  in my research .I have managed to plot a few curves using mupad, a powerful symbol computation soft. Since it is theory solution, I want to add the experimental curves to compare the goodness.But i don't how to make the two softwares work cooperated. 

Any suggestions will be appreciate.

(Forgive my poor English^_^) 

haiwei zhang

fdzhw@yahoo.com.cn