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Postdoc Opening: Non-reciprocity in Acoustic Systems with Nonlinear Hierarchical Internal Structure and Asymmetry

Location: Georgia Tech, School of Mechanical Engineering, Atlanta, GA
Advisor: Michael J. Leamy, Associate Professor
Funding Source: National Science Foundation (4 years; $2,000,000)

Incrementally linear constitutive model. Nonlinear solution procedure

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Hello everyone,

My doubt is related with the obtenion of the true stress when using incrementally linear constitutive models (hypoelastic models). These models, alternatively to total stress strain models, related increment of strain and increment of stress. The predicted stress is obtained by adding to the previous stress the stress increment obtained by using the tangent matrix. By using total stress-strain models it is clear that the true stress is obtained by substituting the current strain into the constitutive equation. How do we do this for hypoelastic models?

Wenbin Yu's picture

Run GEBT online within a web browser

One can now run GEBT (Geometrically Exact Beam Theory), a general-purpose nonlinear composite beam solver, online within a web browser through cdmHUB.org. Users do not have to install the code on their own machine. And users can access to immediate support if run into any questions. You are welcome to try out the code and let me know any of your questions. 

Twebb83's picture

Abaqus Users Meet Up- 25 Locations Worldwide

 The SIMULIA Regional User Meetings (RUM) are being held in 25 locations around the world.

6 locations in the United States; 2 locations in Brazil; 7 locations in Asia/Pacific; and 9 locations in Europe.

Attend a RUM near you to meet other Abaqus users, learn about the latest FEA and multiphysics technology in Abaqus, as well as the latest Process Automation, Design Exploration, and Optimization technolgy in Isight and Tosca.

Find the location nearest to you here:

Problems with numerical integration of discontinuous functions

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Hi everybody,

 I am a very beginnerin doing research :-) and my topic is about "micro indentation analysis using continuum dislocation theory". I am applying high-order finite element method for this nonlinear problem.

My plan is first writing a subroutine for the element. However, when I intend to compute the internal force by using Gauss integration, I see a problem with the integrand function of some index of the internal force vector. This integrand is discontinuous function. It is therefore, I cannot get a good approximation with the standard Gauss integration. 

Problems with numerical integration of discontinuous functions

Hi everybody,

 I am a beginner in doing research :-) and my topic is about "Micro Indentation Analysis using Continuum Dislocation Theory". I am applying high-order finite element method for this nonlinear problem.

 My plan is first writing a subroutine for the element. However, when I intend to compute the internal force  by using Gauss Integration, I see a problem with the integrand function of some components of the internal force vector. This integrand is discontious function. It is therefore, I cannot get a good approximation with the standard Gauss integration.

On-Demand Access to View Recorded Abaqus 6.12 Presentations

Were you unable to attend the 2012 SIMULIA Community Conference (SCC)? Did you miss the Abaqus 6.12 release webinar to learn about the latest features and enhancements? If you answered "yes" to either of these questions, we have good news for you!

For your convenience, we are providing you with on-demand access to two SCC General Lectures focused on Abaqus 6.12, in addition to the standard release webinar. Click on one of the links below to bring you to the SIMULIA Learning Community, where you can perform a quick registration to view all three recordings.  

How to get inside the ABAQUS incremental/nonlinear static solver

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Hi guys,

I'm working on an ABAQUS extension/plug-in of a sort and I'd like to replicate results for a single 4-node plane stress element produced by the ABAQUS incremental/nonlinear static solver.

I assumed the relationship is:
t[K] {Δx} = t+Δt {P} - t{F}

Postdoctoral Fellow in Orthopaedics Surgical Simulations and Applied Computational Mechanics, Northwestern University

Postdoctoral
Fellow in Orthopaedics Surgical Simulations and Applied Computational
Mechanics, Biomedical Engineering Department at Northwestern University, Chicago,
Illinois

UEL ABAQUS Subroutine

Hi,

I'm stucking with my subroutine. May ask anybody to have a look the the file. 

I run a simple model that and try to run it,but an error message was appeared as below;   ***ERROR: USER SUBROUTINE UEL MISSING

 

I don't know what is the problem. I did locate the input (.inp) and user (.f) in the same folder and run it (abaqus job=.... user= ...ff int )

 

Hope to get help from anybody...

 

Aida

An Introduction to ATOM: Nonlinear Structural Optimization for Improved, Rapid Product Design (FREE WEBINAR)

Register for this FREE webinar to learn how the Abaqus Topology Optimization Module (ATOM), from Dassault Systemes SIMULIA, delivers advanced capabilities for nonlinear structural optimization and provides important benefits to engineers and product designers by identifying the optimized topology and shape of a structure.

For more information, visit: http://bit.ly/j6JZdn, or www.simulia.com -> events -> webinars.

Post crack behaviour in ANSYS for concrete beam-column connection.

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Have a prob in Analysing  FEM discrete model of Beam column connection [both monolithic and precast] for crack behaviour indisplacement controlled cyclic loading program.

 

Tried with various values of closed and open crack and co-efficient. 

applied -1 for crack and changed even the keypoint

in stiffness multiplier also 0.6 also set keypoint 7 to "1" instead of default value "0"

 

But even by all these the analysis runs only for 0.3mm of deflection.. 

 

Twebb83's picture

Call for Papers on Abaqus FEA for 2011 SIMULIA Customer Conference

The 2011 SIMULIA Customer Conference (SCC) will be held May 16-19, 2011 in beautiful Barcelona, Spain. A city filled with world famous museums, historical sites, shopping, entertainment, and culinary delights.

We are pleased to invite you to join your colleagues and share your Abaqus FEA experience by submitting an abstract by November 8, 2010.

Abstracts are also being accepted for papers detailing the use of Isight for simulation process automation and design optimization.

Twebb83's picture

Coconuts, Blood Cells, Snail Armor - What do they have in common?

As the 2010 SIMULIA Customer Conference approaches, it reminds me of a thought-provoking presentation given by Dale Berry of SIMULIA at the 2009 SCC in London.

He reminded the audience, of engineers and researchers, that Realistic Simulation is not only good for evaluating mechanical behavior of product performance, but it’s also an indespenible tool for driving innovative research that improves our lives and society.

Twebb83's picture

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.

Learn More at:

Progressive Failure Model

Hi

Am currently running Ansys analysis using shell181, and Tsai-Wu FC, have some good working first ply failure models

Trying to convert this into a progressive failure model, with no luck so far.

Anyone know something about this, how it could be done?

I suspect by looping, and fortran code, but I do not really have a clue..

ADINA: Automatic Dynamic Incremental Nonlinear Analysis

The ADINA System offers comprehensive capabilities for linear and nonlinear finite element analysis of solids & structures, CFD, fluid-structure interactions, multiphysics, and complete pre- and post-processing with interfaces to various CAD and CAE systems. It also offers user subroutines for material models, elements, loads...

Henry Tan's picture

Instabilities in Material Behaviors

The linked two of my studies can be used as references for Zhigang’s lecture on Instabilities.

(1) Catastrophic fracture

Robin Selinger's picture

Energy conservation in nonlinear finite element explicit dynamics

I am writing to ask about the state of the art in finite element simulation using nonlinear elasticity and explicit dynamics.

Consider, for instance, a 3-d simulation of a hyperelastic beam that's fixed on one end, then  twisted about its long axis by 360 degrees and released. If we apply no friction or viscosity, the sum of kinetic plus potential energy should remain constant as the material springs back and oscillates.

Which FEM codes do the best at conserving KE+PE for a simulation of this type?  If you drop the time step, can you get energy conservation to many significant figures, as one can with, for instance, molecular dynamics simulation? 

I'm curious because I've recently written my own 3-d nonlinear explicit dynamics code that provides very high precision energy conservation, and I'm wondering if it's any better or worse than the nonlinear explicit dynamics codes already available.

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