ABAQUS

Temperatures updating in Abaqus (V)umat.

As we know, Abaqus/(v)umat provides the temperatures at each material point at the end of the increment, but in a thermo-mechanical problem, the heat induced by plastic deformation is unknown before the plastic strain is calculated. So, How the temperatures at material points in abaqus are updated?

Thanks in advance.

 

Y. T.


manz_0's picture

FLUID CAVITY HELP

I am modelling an inflated sphere. The sphere is composed off two circular planar membranes joined together at the boundries. 
I have modelled the inside of the sphere as a fluid cavity and will inflate it to its threshold limit. 

I have achieved this by using the fluid cavity and fluid inflator method but for some reason when I run my input file I receive the following message: 


SIMULIA's picture

Caterpillar, Tenaris, MAN Diesel & Turbo, and more - Check out the latest SIMULIA Community News!

The latest issue of SIMULIA Community News takes a look at how engineers in the industrial equipment industry are using realistic simulation solutions to optimize performance, evaluate designs, and further their understanding of the environments they work in. Additionally, see how Mazda balances performance and weight in a steel car body and NSE Composites validates their sweep-twist wind turbine blade design that captures 12% more energy.


Help in case of modelling PIezo In Abaqus (PLEASE!!)

Hi colleage

I am modelling a Piezo Beam 2D and 3D, i have no problem with 3D when i want to apply voltage load, But in 2D, when i apply load i Dont get any results in case of stress and strain Also when i apply pressure to beam, i Must get Voltage in Piezo but nothing happend, PLEASE HELP ME IN THIS CASE; THANKS ALOT 


fe-safe

I'm using Abaqus in analysis of random vibration fatigue. I linked abaqus with fe-safe to calculate the fatigue life. Fe-safe didn't recognize the random load comming from Abaqus correctly, althghou it already recognize the cyclic(normal) load crrectly in one of the tutorial's attached example.

Do any body know how to solve this issue? 


SIMULIA's picture

Technology Brief: Optimization of Turbine Blade Dovetail Geometries Using Abaqus and Isight

The reliability of a gas or steam turbine is strongly
dependent on the blade structural design. 
Turbine blades are subjected
to very strenuous environments such as high temperatures, high stresses, and a
potentially high vibration environment. To avoid blade failures, they must be
designed to withstand these conditions. 


A little humor for your day...Cats using Abaqus

Hi everyone,

There is a video on YouTube now of a cat using Abaqus...more specifically, the Abaqus Knee Simulator (Abaqus 6.12 release). Hope it makes you laugh:

http://www.youtube.com/watch?v=ECC_6GCgiIg&feature=plcp 

Have a great week!


Matt 


Non zero initial accelerations in a dynamic computation on Abaqus

I want to start a dynamic calculation in Abaqus in which, for every node, I specify the displacements, velocities and accelerations. I know that by the *IMPORT command, I can start a calculation with a deformed mesh, and that the velocities can be defined by in the *INITIAL CONDITIONS, but how to deal with non zero user defined accelerations? Have any body did that? Is it possible with a subroutine?

Thanks for any help


hanrrycn's picture

how to get the pressure value inside the cohesive element

I build a water inject model with COH3D8RP element, in the simulation, I can get the pore pressure value around the cohesive element, but I can't the value inside the cohesive element. the pore pressure changed around the cohesive element because of the pressure inside the cohesive element changes, however, I can't get the value of pressure inside the cohesive element.

 


Sandip Haldar's picture

Crushable Foam Plasticity Model (Abaqus 6.10)

I am trying to perform simulation of Crushable Foam Plasticity model. However, I am getting convergence error

***NOTE: THE SOLUTION APPEARS TO BE DIVERGING. CONVERGENCE IS JUDGED UNLIKELY.
***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT

Can someone please help. I have attached the image of Abaqus input data.

Thanks a lot in Advance.

 

 


Elastic-plastic analysis

Hello Everyone,

I am a beginer in using Abaqus. I am going to model a nothed specimen subjected to cyclic loads, to investigate the stress/strain distribution and so on. I would appreciate if you guide me. 

 


Sprunger's picture

2012 Abaqus Image & Animation Contest - Win an iPad!

iPad


SIMULIA's picture

Road Restraint Systems in Abaqus - 2012

In this paper, a correlation between simulation and a full crash test is presented. In order to achieve good agreement in the correlation, several Abaqus analysis techniques are evaluated.


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Traction Prediction of a Smooth Rigid Wheel in Soil using Coupled Eulerian-Lagrangian Analysis - 2012

The approach to modeling soil is validated by comparing predicted traction of a trolling rigid wheel to measured traction test date available in the literature. Comparison of the measured and predicted traction force shows that this approach is reasonable for predictin traction in soil.


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Integrated Tool for Strain Extraction in Virtual Testing - 2012

This paper presents an automated approach to extract strains of aircraft structural models from widely used CAD and FE environments. The developed approach has been implemented as an integrated tool in widely used CATIA V5 and Abaqus environment. The integrated tool is a quick inexpensive and effecive technique for predicting structural strains.


SIMULIA's picture

Modeling the COnstitutive Response of Metals Under Complex Loading - 2012

In this paper, the different "built in" material models based on the isotropic, kinematic and combined istropic-kinematic hardening theories available in Abaqus/Standard are evaluated for carbon steels. The results presented in this study are expected to provide important insight to practicing engineers dealing with inelastic material characteristics.


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Structural Topology Optimization of Multilink Suspension System Using ATOM - 2012

This study demonstrates a simulation of an integrated multilink suspension system model in
Abaqus. The model is assessed in Abaqus to determine the suspension strength and fatigue life of each individual link. This topological design optimization is executed for this multilink suspension model using ATOM to determine the critical load path, alternative concept designs, and locations for mass reduction in order to meet the performance requirements.


SIMULIA's picture

Thrust Collar Bearing Design Optimization using Isight - 2012

This paper describes the parameter-based geometrical optimization of a thrust collar bearing. The thrust bearing, for example, has to carry the whole axial force of the rotor with only minimal deformation of the collar surface over the turbocharger’s complete operating range.


SIMULIA's picture

Pipeline Dynamics with Flowing Contents in Abaqus/Standard - 2012

This paper discusses a method to address this challenge by the creation of a moving
tie constraint via the MPC user routine. This approach allows the change in weight; change in inertia and effects of fluid momentum to be correctly and conveniently captured using dynamic modelling.


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Using the Failure Assessment Diagram Method with Fatigue Crack Growth to Determine Leak-before- Rupture - 2012

The objective of this paper is to use Abaqus/Standard to compute elastic-plastic J-integral results along the crack front. These results are then used to calculate the plastic collapse crack reference stress, especially for cases when the reference stress solution is not available for a structural component.


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Finite Element Analysis in Offshore Geotechnics – A Thirty-Year Retrospective - 2012

The paper covers foundation performance issues and applications for pile-founded, gravity base, and deep water structures. Many of the significant applications were complemented by extensive experimental test programs to confirm or validate the analyses.


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Stress analysis and modal analysis of the largest bearing test rig in the world - Astraios - 2012

The principal objective was to ensure reliable design of the large size bearing test rig. The main challenge here concerned the simulation method for representing the complex mechanical construction of the machine with sufficient precision in an FE model.


SIMULIA's picture

GPU Computing with Abaqus 6.11 and its Application in Oil & Gas Industry - 2012

This paper examines the performance characteristics of Abaqus 6.11 release for the latest GPU computing technology. The results are provided for finite element models with material, geometric and boundary nonlinearities relevant to current practice in the oil and gas industry, on workstation configurations, including a network of workstations.


Manaliac's picture

VUMAT user subroutine dealing with several integration points

Hello All,

 

I have some questions concerning the VUMAT subroutine, I run successfully an
analysis on one element with one integration point,
so my first question is how to code for several integration points (
nblock concerns only the material points not the integration points)?

My second question is how to write for datas dependent of temperature (like Young and shear modulus)??

Thank you all for your answers.

Manal


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