# ABAQUS

## ExxonMobil and Tetrapak Keynote at SIMULIA Customer Conference - Early Bird Registration Open

Early bird registraion is open for the 2010  SCC which will be held May 25 - May 27, 2010 at the Rhode Island Convention Center in Providence, RI, just a short distance from SIMULIA's world headquarters.

There will be more than 80 customer presentations over the course of the 2 1/2 day conference. Advanced Seminars are offered on Monday May 24.

All users of SIMULIA products including Abaqus FEA, Isight, Fiper, and SIMULIA SLM invited to register for the conference.

## Viscoelastic material model in abaqus-am i taking the correvt approach

Hi all,

I have been trying to gain an understanding of representing a viscoelastic material in abaqus. To do this i have been trying to represent polypropylene using data obtained from creep curves found in literature (attached). To now what i have been doing is the following: Note i am using Abaqus 6.7

In material manager: selecting Elastic-inputting Instantaneous Youngs Modulus, E, Poissons, v, (E=1.8GPa, v=0.4) and setting the moduli time scale to instantaneous. And Viscoelastic-Domain:Time, Time=Creep Test data and inputting Shear Test Data

## Modeling heat transfer involving a phase change (ice to water) using Abaqus

I'm modeling the transient heat transfer of a cooler with an ice pack in it. How does one accurately model the phase change of the water? Here's what I've tried so far:

1. Added latent heat property to material card. Used Latent heat = 334 kJ/kg, Solidus Temp = 0, Liquidus Temp = 0

Result: Error, Solidus and Liquidus temps cannot be equal

2. Solidus temp = -0.01, Liquidus temp = 0.01

Result: Analysis ran, but diverged very early in the analysis.

## Help with movement representation in Abaqus

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Dear sirs,

I would like to seek your assistanceon using the Abaqus software  .

I am trying to study the stresses inpavement layers , by applying  movingloads caused by vehicles. However I have not been able to get a visualrepresentation of the moving load.

I would like to know how to get acycle of movement , to and fro ...over a period of years .

## ABAQUS and Constitutive equation

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Dear all,

I'm new to ABAQUS and I was wondering if we could have access to any constitutive equation in ABAQUS and add another stress tensor to the Cauchy stress tensor?

regards,

-- Hamid Attaran

## Cohesive material zone model and ABAQUS subroutines

Hello,

I'd like to ask if anybody knows if it is possible to use an ABAQUS usersubroutine that could vary some parameters (τmax, kn or ks etc) of the cohesive zone model of ABAQUS with the vertical pressure applied on the interface. The new ability of ABAQUS to support cohesive behaviour in contact surfaces seems very interesting and useful, however how could somebody simulate the interface under a compression - shear regime that may follow a Mohr-Coulomb type behaviour?

## Damage modeling in ABAQUS 6.9 in surface based cohesive behavior

I am working on shear failure of sandwich composites.I have modelled a sandwich composite with surface based cohesive behavior in ABAQUS 6.9.Now i have to do damage modelling.

## Modeling grain boundaries using FEM (Abaqus)

Hi,

I would like to model a microstructure using Abaqus. My question is how to deal with the grain boundaries ? Should I use cohesive elements ? Any ideas on modeling grain boundaries using FEM will be very helpfull.

Thanks,

Ayoub

## Section points in user elements

Dear Group,

does anyone know how section points can be defined in user-defined elements UEL ?

I am trying to program my own beam element in ABAQUS. The beam element library does not provide a beam element with temperature as a degree of freedom which would come as an asset in our application.

Beam elements feature so-called section that provide the spatial resolution through the thickness. I cannot find any clue how this can be programmed. ABAQUS standard elements give results for strain, stress and the like at these section points.

## A question on UMAT implementation of non-local theory

Hi, friends,

Now, I am implementing the non-local continuum theory in ABAQUS through UMAT programming.

Unfortunately, I have been obstacled by the following question:

On one hand, in non-local continuum theory, the non-local strain of every particular integration point is determined by the global strain field all over the specimen.

## How to represent a "bird" in ABAQUS

Dear all,

I will model a bird to impact a shell at high velocity by ABAQUS.  I decide to model the "bird" by ALE mesh and referred by EOS equation.

However, most simulation works are done by LS-Dyna. Do anyone know how to determine the parameters in ABAQUS for the "bird" in EOS equation?

All suggestions are welcome.

Thanks.

Jason,

Best regards

## Effective strain rate and strain rate in ABAQUS subrotine

Hi there,

would you please tell me how can I use or calculate the effective strain rate or strain rate in ABAQUS subrotine?

thank you!

## Help in abaqus modelling

Hi all,

I am currently working on my Masters thesis which is the analysis of sandwich structures subjected to blast loading using Abaqus. Can someone suggest some references which would  explain me how to apply blast loading using abaqus.

There is an example problem of submarine in the abaqus user's manual which includes the blast loading. But they've only given the inp file for that.

So can someone also tell me how to generate .cae file from .inp file in abaqus.

Best Regards,

## Delaminated Composite Plate

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Hi,

I am researching delaminated composite plates.

How can i model the delamination area in two plies, is abaqus a correct choice for modelling?

Delamination area is rectangular or circular.

Regards.

Dear all,

## Frictional Coulomb model in Abaqus

Hello everybody,

I'm trying to add friction in my model.Now I have a body that is simply supported in a direction (vertical) and free to move in another one (horizontal). I want to use Coulomb friction in the horizontal direction in order to reduce displacements in that direction.

I read Abaqus User's Manual vol5 30.1.5 (frictional behavior) and I followed commands written there, but I think that works only with multiple bodies and not with a single body. I'm using Abaqus 6.7-1.

Could Someone help me?

Many many many thanks

Nicholas