Hi,

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.

See: E. J. Barbero, F. A. Cosso, R. Roman, T. L. Weadon, Determination of Material Parameters for Abaqus Progressive Damage Analysis of E-Glass Epoxy Laminates, Composites Part B, 46(March 2013), 211–220, http://dx.doi.org/10.1016/j.compositesb.2012.09.069

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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. 

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

where:
sigma = stress
epl = strain
_dot_ are my rate change with time
sigmav = sigmaxx + sigma_yy + sigma_zz ( hydrostatic stress)
eplv = elp_xx + elp_yy + epl_zz ( hydrostatic strain)
lambda, vbar, kappa, mu, lambabar, mubar are all material constants that changes has a function of temp.

Hello,

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  ?

thanks for helping me ... 

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.

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 

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. 

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 

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!

Hello all.

For the below cases: 

1) Penny-shaped crack in a cylindrical bar

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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 ?

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

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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

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.

It is showing error " Too many attempts were made for this increment". I have no idea where I went wrong as I just ran the UMAT with it's own physical model. Please can anyone provide me a running UMAT of Dr. Huang ? I think there is something I need to change. Also, guideline for learning UMAT will be a great help.

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 !

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 http://www.imechanica.org/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)

Thanks for your help and sorry for my bad english

  PD: this is the link of the article in ScienciDirect http://www.sciencedirect.com/science/article/pii/S001379440800297X

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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. 

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