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Pocivavsek's picture

strain/stress in local material coordinates

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We are doing simulations of simple bilayer composites which undergo extensive buckling and post-buckling instabilities. The simulation is being done with ABAQUS explicit to capture the highly non-linear geometries. Everything works very well, however to compare with our analytical theory we need the Green strain at each element. ABAQUS for solid elements gives only the NE or LE which is projected onto the global coordinate system.

mmalekan's picture

How to update nodal values of an existing Abaqus odb file?

Dear All:

I want to update some nodal values of an existing Abaqus odb file using pyhton script. The problem is I don't know what kind of commands should I use in order to do this task?

Another question is how to delete an existing FieldOutput variable from odb file. I know by using add "addData" command, we can add user-defined field to the odb file, but how to delete an existing field output?

Thanks for your help,


ABAQUS 6.14 CAE "pre.exe" error

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I am planning to analyze my Senior Design Project by statically on Abaqus, since I am just an undergraduate student, I am also planning to do this on my new laptop that have;

8+4 GB DDR3 800MHz RAM

Intel i7 4700HQ 3300 MHz Processor

nVidia GeForce GT 750M Graphics

I got Abaqus 6.14 from my school, I tried to make a simple example to test the program is running with no error, finally I have an error with this message;

Youssef Hafiz's picture

Direct Dynamic Analysis Method (DDAM) of the US Navy... Not found in Abaqus 6.14!!

I worked with Direct Dynamic Analysis Method (DDAM) of the US Navy with Abaqus in 2007, but when I revisit it again in 6.14 version I didn't find it and it is not in the documentation also. Is it removed from Abaqus? and  why? In ship building industry, they use it heavily till now.

Please, find the attached file about the method from a Simulia document in 2007

Simpleware Webinars: Intro to Animations Tools and New Physics Modules - February 11th and 18th

(re-arranged from January 14th and 21st)

We're running two webinars in February on the latest additions to our software ScanIP's 3D image processing, visualisation and model generation capabilities. The webinars are ideal for existing users and those wanting to learn more about creating models from 3D images.

Introduction to the new ScanIP Animations Tool on February 11th (8am/5pm GMT)


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Nice to meet you,

My name is Thuan, Student in Korea.

I am sudying about composite plate.

Could you send me Matlab code of composite plate?

My email is


Asking for help about fixing an error while creating a model and simulating it using "SimMechanics"

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Hello , everyone ! I really need your help ! 

I've created a model for a 6DOF (RRRPRR) robot but I keep getting an error message about the "Revolute4" joint . 

Can anyone help me fixing it as soon as possible , please ? Thanks in advance . 

Ansys Workbench

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Ansys Workbench 

I work with both Beam188 elements and

Link180 elements and would like to be joint them together.

Is this even possible, How can I achieve this

How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

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How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

hello engineers

i need help about concrete damaged plasticity

fo example :

if Compressive stress (Fu)= 51.2 MPa

and tension stress (σ t)=0.3 x 51.2^(2/3)=4.136

1)why (σ t) is 2.36 in picture(uploaded)?

2)what is tension strain ? and how? i cant understand.

i cant obtain εt = total tensile strain.

how obtain εcr ?

please help


Equivalent Conwep pressure in abaqus

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I modeled a sandwich panel under blast loading with conwep function in abaqus,

My problem is that I want to read the equivalent pressure due to amount of TNT I assembled in abaqus,

Do you have any idea how I can get it?

I know that there is an equation for calculating the pick pressure due to conwep loading but I want to read that in abaqus.

What is the appropriate field output or history output for pressure due to conwep loading?



Free Simpleware ScanIP 7.0 Webinar - Dec 11th 2014

8am-9am GMT or 5pm-6pm GMT


The latest release of Simpleware’s 3D image processing and model generation software includes new features designed to enhance visualisation, analysis and segmentation of 3D image data. Features include a particles analyser, centreline tools and new physics modules for calculating effective material properties using homogenisation techniques. 

Simpleware Version 7.0 now available

We're delighted to announce the Version 7.0 release of our 3D image processing, analysis and model generation software. The release comes with a wide range of new features including:

New Animations - generate animations from within the ScanIP interface - explore your data and create videos to communicate work to colleagues, with options for 'fly-throughs' available.

how to calculate dispersion relation with ABAQUS ?

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  I wanna get the dispersion relation of acoustic crystals in ABAQUS, so far as I know, the frequencies can be obtained by applying different wave vectors in the IBZ, but I dont know how to opperate in ABAQUS, in what way can we simulate the wave vectors (or the cooresponding wave length) . By applying force or displacement, or acceleration ?

 Attacthed, should I model the whole structure or just the 1st BZ? If the 1st BZ is employed, should the periodic semmetric B.C. be considered in my model?

Any suggestion is appreciated! 

Co_simulation abaqus dymola


How can i run a co_simulation with two PC, one will run with abaqus and the other will run with dymola 

How can i do this Co_simulation 


wael_alawsey's picture

creating a zero-thickness layer using ABAQUS 6.13

i have concrete slab and cfrp sheet i want to strength that slab with cfrp sheet so i try to model the epoxy layer as a cohesive layer between them the issue is when creating the orphan meshing which can be done by mesheing all instances as a normal mesh then selecting the slab and cfrp and go to mesh/creat mesh part after that go to mesh/edit and then selecting mesh/offset(creat solid layers) and now abaqus requires to select the element faces from which the offset will be generated so i selected the cfrp surafce that must be sticked to the slab by epoxy and then i create the set and assig

Analisys high cycle fatigue(HCF) in Abaqus

Hello my friends...
I want to study ''fatigue crack growth'' in Abaqus...I need your help...Could anybody help me about this problem??
I need to know, what is the XFEM Abaqus out put for fracture mechanic??I meen does it give SIF,N(fatigue life) and the crack path??I read Abaqus documentation, it has said that Abaqus can do low cycle fatigue,Can I use it for HCF?? do I need to write a code or subroutine??
Thank you

UMAT implementation

Hi all

I want to use Abaqus UMAT subroutine and I don't know how can I use the subroutine in Abaqus materials.




wael_alawsey's picture

how to model a CFRP sheet attached to concrete using resin by ABAQUS

hello everybody ..

iam trying to model a one-way rc slab with opening and strength that opening using CFRP sheets by attaching it to the concrete slab using resin as a cohesive layer 

i have the properties of CFRP sheet ( thickness,tensile strength,elastic modulus,ultimate tensile strength)

also have the resin ( epoxy) properties (tensile strength,elastic modulus)

so please i need help on how to model all this strengthening using ABAQUS 6.13 

if anyone done that before or have any info about it please update me

regards . . .

DSTRAN in UMAT with nonlinear geometry

Dear Colleagues,

I have done some analysis with nonlinear geometry. I use quadratic 3D solid elements. I have learned the way to calculating DSTRAN and DROT from ABAQUS documentation as follows:

Abaqus - isotropic material definition problem with engineering constants


I am using a steady-state dynamic analysis procedure to model harmonic loading of a structure. I am investigating different material definitions. When I applied transversely isotropic stiffness using engineering constants, I saw a much different response than expected. So, as a test, I compared the following two models which gave DIFFERENT results: 

In SPH method, does it need fracture criterion?

In abaqus ,  there is an example for SPH. It can be obtained by:

abaqus fetch job=ver_prc_projectileimpact.inp

There are two fracute criterion in this file.

But even both of them are removed, the simulation results are similar.


In SPH method, does it need fracture criterion?


ANSA or Hypermesh

Hi all

I am using Hypermesh for modelling a simulation model for automtorive structure.

But I dont understand which is better for my usage.

I need to make 1.Geometry cleanup 2.Mesh (2D & 3D) 3.also setup for some type of analysis (ex: strength,Crash)

Which will be beter for above operations.


ABAQUS Element Connectivity


I am trying to mesh the hollow sphere attachged using structured BRICK-8 elements. It turns out in order to have a structured mesh, I have to have 2 partitions such that four quadrants be generated.

What I only need from ABAQUS is the element connectivity. I do not need to solve any problem.

ABAQUS subroutine for compressible neo-Hookean material

Hi everyone, 


I am new to ABAQUS software and recently i was trying to implement compressible neo-Hookean material in ABAQUS and for me it is a very difficult task. There are already codes available for the nearly incompressible neo-Hookean material. Since ABAQUS is a widely used software,  i was wondering whether there are any database avaible consisting different codes that we can access. I am desperately looking for a subroutine for compressible neo-Hookean material. Can someone please help me or give me some direction. Thanks a lot !




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