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ebarbero's picture

How to find material parameters for Abaqus PDA

The PDA model implemented in Abaus is an implementation of the idea of the cohesive zone model (CZM), which is quite popular for the analysis of delaminations, but PDA is for intralaminar damage. The problem my group faced when trying to use PDA was "where do we get the material parameters?"  We asked around in blogs and such but could not find a definitive answer. So, we went to work and came up with a methodology that may serve you.

ebarbero's picture

New book: FEA of composites using Abaqus

New textbook includes an explanation of the concepts involved in the detailed analysis of composites, a sound explanation of the mechanics needed to translate those concepts into a mathematical representation of the physical reality, and a detailed explanation of the solution of the resulting boundary value problems by using commercial Finite Element Analysis software such as Abaqus.

ABAQUS set a limit time for the esecution of a job

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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. 

Inaccurate UMAT result in SMP model

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Hello:

I have written a UMAT subroutine similar to the one shown in abaqus 6.11 subroutine manual 1.1.40 with a slight differences indicative of the material's rheological model.
my expanded isotropic model looks like:
sigma_x - sigmav_x/3 + vbar*sigma_dot_x + kappa*sigma_dot_x =
lambda*eplv + 2*mu*epl_x + lamdabar*eplv_dot_x +2*mubar*epl_x

Abaqus - Job aborts reporting that it can't change the current working directory.

Hello,

I have an Abaqus 6.12-3 installed on a Windows 8 64-bit system.
Everything works smoothly. I am easily able to take control of the CAE
and model, define loads, steps, sections and jobs. The problem is while
running the jobs. The job aborts splashing an error "Unable to change
the current working directory to
C:\Users\ANIABU~1\AppData\Local\Temp\Ani Abu_I-beam_3876." This happens
with all the jobs. Rarely does the job complete successfully, but I am
unable to understand the underlying procedure. I did not request any

Abaqus results

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Hi,

i try to simulate a 3 points bending of a glass plate with abaqus.

force 1kN !

young modulus = 7e10 Pa

Poisson's ratio = 0.22

- the plate is square (30 cm) , thickness 8.72 mm

- i use 3D extruded solid

- for the load i can't create a line load so i replace this load by pressure in a thin surface (2mm*30cm) applied in the center of the plate

- C3D8R element type

 but the results are strange:

the maximum displacement is 0.672 mm !

is that realistic ? 1kN and just 0.672 mm of central displacement  ?

Model steel phase change and residual strain and stress using abaqus

 

Hi, I'm a Mechanical Engineering student and I need to learn how to create a simulation of the martensitic transformation as a result of quenching of steel using Abaqus.

I'm just trying to get as much information as I can on my own but I want to ask for some advise; at this time what I have found is that I may need to use some Abaqus user subroutines as UMAT or VUMAT ir order to succed on the simulation but I want to know if theres any other way to avoid using them.

droptest of model having crack in it in ABAQUS

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Hello,

I have a question to Abaqus users,

Can I simulate a drop-test of a model having crack in it in Abaqus/explicit.

If yes, whether Contour integral crack type can be used or I have to use XFEM?

Reply asap

MAil id-rbhute95@gmail.com 

 

Lamb wave simulation in Abaqus tutorial

Hello!

I am trying to generate acoustic waves in aluminum bars and plates to simulate an experiment we are performing in the lab. We use piezoelectric actuators to generate and receive the waves in the lab. I know that similar simulations have been done in Abaqus, however, I an having difficulties getting the simulation to work. Is there a tutorial or does anyone have any experience with this kind of simulation? Your help is appreciated ! Thank you.

Cheers. 

hamawandy's picture

wind load on transmission towers

Dear All

 

 

I want to assign wind load on a 3D transmission tower USING abaqus, how can I assign the wind load on the transmission tower  ? should it be assigned as a bodyforce or joint load ? your comments are highly appreciable.

 

Thank you

 

Nazim Nariman

kakarevi@yahoo.com 

Kewei Li's picture

Surface Pressure in Smoothed Particle Hydrodynamics Model

Hi, All: I am working on a fluid structure interaction problem with Smoothed Particle Hydrodynamics (SPH) method in Abaqus. My solid is a deformable structure. I would like to know the pressure on the surface of structure where solid and fluid (particles) contact with each other. I wonder how could I output this vailable from the SPH model in Abaqus. Thanks a lot in advance for any help!

Stress Intensity Factors calculation by using ABAQUS

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Hello all.

For the below cases: 

1) Penny-shaped crack in a cylindrical bar

2) Penny-shaped crack in an infinite body

3) Semi-elliptical surface crack 
I need to calculate the stress intensity factors by using ABAQUS. 

  

Please help me how can I start and provide me any tutorial/example if you have.  I shall be grateful to you. 

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Problem with abaqus : shell-solid assembly

Hello everyone !

I'm new to abaqus and have a problem with the shell-solid assembly. I want to model a shell element (plate) clamped into two solid elements (parallelograms) on its top and bottom edges.

I've tested different possibilities to do my assembly (shell-solid coupling, merging the geometry or the mesh when assembling the two elements) but none of them work. There's always a problem whis the definition of the elements' properties when I submit the job.

Does anobody have a solution ?

Stacking of DOFs in Abaqus

I am studying the response of a bridge in MATLAB, and have successfully retrieved mass and stiffness matrices from Abaqus using the following keywords:

 

*Step

*Matrix generate, STIFFNESS, MASS

*Matrix output, STIFFNESS, MASS, FORMAT=COORDINATE

*End step 

 

This gives matrices on a mathematical form, very well suited for use with MATLAB. 

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Aqua load by python

Dear All

I am quite new in this area.

Somebody can give me an idea on:

How to impose aqua loads by phyton scripting in abaqus?

Thanks in advance

Polluelo

Soud Choudhury's picture

Need help for running UMAT of Dr. Huang's single crystal

Hello Everyone,

I am a new member of imechanica. I have started to learn UMAT of Abaqus to model my material behavior ( Cu6Sn5, HCP) using crystal plasticity finite element model. I found Dr. Huang's single crystal UMAT to start learning UMAT and I thought that it would be a great guide to start though it is written for FCC mat. But unfortunately I was not able to run the UMAT with it's input file.

Finit element Analysis of mandible bone with implant

Hi everyone
i work on a bio mechanic project. i am going to simulate a mandible bone
with implant. at first i want to use Materialise Mimics V10 to convert Ct Scan
data of a mandible without implant to a 3D model. i thought i could edit
the exported file on the other software (Ansys or Abaqus) to add the
implant. but, exported file from mimics can not have any edit .Actually
it has not volume and i need to have a 3D solid model. please help me !

Preprocessing files for ABAQUS XFEM implementation

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Hello,

 

This is my first post in imechanica and i hope you can help me, im working in my finall project to obtain my MsC, im working in the simulation of crack growth in freeting fatigue, i found usefull the article post in imechanica by Eugenio Giner node/4338. Im having problems with the preprocessin files, Can you help me with some information about how to create the input files? (i have some basics using ABAQUS CAE, but i dont know how to create the input files like mOXY.prn, TopNox see article)

 

SIMULIA's picture

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Cyclic loading abaqus

Hi colleague

 

can you help me to define a cyclic load of 1 kN (120 cycle per min ) in Abaqus?

does it diifrent to use static or dynamic analysis?

Thanks. 

characteristic Length

Hi

 

is there a way to get the characteristic length of one element? I wanna calculate xult (when the element is cracked, fracutred..). 

 I use the concrete damage plasticity model and after reaching the tensile strength i assume a linear softening with fracture energy.

 

Input are:

   Young´s modulus

   max. tensile strength

   fracture energy

 

Outpu:

   when do i reach xult or what is the plastic strain equivalent

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