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ABAQUS (6.8, 6.9 EF) - Effect of the number of back stresses

Since ABAQUS 6.8, a new feature has been added to the combined hardening
material input.

Let's assume a combined Kinematic and Isotropic hardening case, such as
those happen in metals.

"Half cycle" uni-axial test results has been utilized to model the yield
stress-plastic strain behavior as well as the Kinematic behavior of the
metals.

In the same user interface,  there is an option to choose the number of
back stresses.

ABAQUS (6.8, 6.9 EF) - Effect of the number of back stresses

Since ABAQUS 6.8, a new feature has been added to the combined hardening material input.

Let's assume a combined Kinematic and Isotropic hardening case, such as those happen in metals.

"Half cycle" uni-axial test results has been utilized to model the yield stress-plastic strain behavior as well as the Kinematic behavior of the metals.

In the same user interface,  there is an option to choose the number of back stresses.

Is the number of 1 back stress is equivalen to the case of linear kinematic hardening (Ziegler's)?

Konstantin Volokh's picture

Barenblatt's paper

I attach Barenblatt's paper which is difficult to access. The paper includes a milestone idea of the cohesive surface that  allows us to get rid of unphysical singularities in the older formulations of fracture mechanics.

Henry Tan's picture

Subsea Integrity

I am teaching Subsea Integrity for the MSc students majoring in Subsea Engineering at the School of Engineering, University of Aberdeen. This is a course that combines the fundamental principles (corrosion, fracture, fatigue and material selection) with the industry applications (subsea integrity management and implementation, cathodic protection, case studies on subsea reliability and engineering assurance).

 

Teaching time schedule

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:

Angelo Simone's picture

PhD position in computational mechanics

A fully funded PhD position is available in the area of multi-scale modeling of geomaterials within the research project Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE at Laboratoire Sols, Solides, Structures – Risques (3S-R), Université Joseph Fourier, Grenoble, France. 

New idea in fatigue problems

there are two analytical concepts that are very important in fatigue failure.the first one is crack closure and the others is residual stress .the first one is in behind of crack and the other emphasis in the front of crack tip. the question is if we use some devices such as AFM/SEM is it possible we model the energy filed during fatigue process?   if this idea can be investigated the second question can be asked: is there any similarity to model for different loading conditions? 

 

I appreciate if you also put your comment in my idea?

 

Bes Regards,

Hydrostatic stress as Fracture/Damage criterion?

Hi all,

       Can Hydrostatic stress be used as a fracture criteria? If so can critical hydrostatic stress be found experimentally? Thanks.

Prestigious 5 year Fellowship -- RAEng/EPSRC Research Fellowships

To all outstanding researchers with less than 3 years of post-doctoral experience, this is a unique opportunity to secure a 5 year post-doc.

This will be highly competitive, and applicants must be of world-class quality. 

Topics available in our group:

- multiscale (fracture) mechanics

- microstructurally-faithful modelling

- surgical simulation

Li Han's picture

Water diffusion and fracture behavior in nano-porous low-k dielectric film stacks

Among various low-dielectric constant low-k materials under development, organosilicate glassesOSGs containing nanometer-size pores are leading candidates for use as intrametal dielectrics infuture microelectronics technologies. In this paper, we investigate the direct impact of waterdiffusion on the fracture behavior of film stacks that contain porous OSG coatings.

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I didn't know enter the force per unite deth to correspend with the load that i need

thank you

Finite element modelling fracture mechanics of polymer/clay nanocomposites

I am Cecilia. In 2007 I graduated in mechanical engineering at the University of Cagliari (Sardinia, Italy).

During the degree courses I took several classes on structural mechanics, including, Mechanics of Composite Materials,

Fracture Mechanics, Finite Element Analysis (with Ansys and Abaqus).

Now I am a PHD student at the Univesity of Cagliari and this is the aim of my research:

Finite element modelling of polymer-clays nanocomposites with

Jeong-Yun Sun's picture

Inorganic islands on a highly stretchable polyimide substrate

For a flexible electronic device integrating inorganic materials on a polymer substrate, the polymer can deform substantially, but the inorganic materials usually fracture at small strains.  This paper describes an approach to make such a device highly stretchable.  A polyimide substrate is first coated with a thin layer of an elastomer, on top of which SiNx islands are fabricated.  When the substrate is stretched to a large strain, the SiNx islands remain intact.  Calculations confirm that the elastomer reduces the

Yuhang Hu's picture

Averting cracks caused by insertion reaction in lithium-ion batteries

In a lithium-ion battery, both electrodes are atomic frameworks that host mobile lithium ions. When the battery is being charged or discharged, lithium ions diffuse from one electrode to the other. Such an insertion reaction deforms the electrodes, and may cause the electrodes to crack. This paper uses fracture mechanics to determine the critical conditions to avert cracking. The method is applied to cracks induced by the mismatch between phases in crystalline particles of LiFePO4

wvmars's picture

European Conference on Constitutive Models for Rubber - ECCMR VI

ECCMR 2009 - Sixth European Conference on Constitutive Models for Rubber

Held at TU Dresden, Germany, September 7-10, 2009. 

www.eccmr.org

Xiao-Yan Gong's picture

Fatigue to Fracture - paper in print

This article will appear in Journal of ASTM International.  I hope you find it useful.

Xiao-Yan Gong, President, medical implant mechanics LLC

www.medicalimplantmech.com

 

FRANC3D - the next generation

I guess it is about time some one from the Cornell Fracture Group got on this site to try help answer questions related to the CFG software or other fracture mechanics related questions.  We do try to answer questions sent to us via email, but sometimes a forum like this would be best and we do appreciate other users input, feedback, and answers.

Call for Abstracts - Symposium on Advanced Computational Methods for Fracture (IMECE 2009)

This is topic 12-21 Advanced Computational Methods for Fracture in the upcoming ASME Congress 2009 (November 13-19, Lake Buena Vista, FL., USA.) Deadline for abstract submissio: March 2, 2009.

The aim of the topic is to recognize the recent development in the computational tools for fracture characterization. The topic is open to all contributions on numerical techniques, simulations of fracture problems at all length scales, failure mechanism modeling, fracture prediction, and computational algorithms to achieve these goals.

Modelling Ice deformation and fracture in Abaqus

Hello Abaqus Users,

I am new to Abaqus: I am trying to model formation and propagation of fractures in glacial ice (note: ice deformation mainly by plastic flow). I was wondering if anyone has modeled ice as a material exhibiting a nonlinear behavior, or possibly have a user subroutine for ice that I could use. Thanks in advance for any help.

Daniel

Cohesive Failure Law

Can anyone please suggest material for Cohesive Failure Model. I need to know the basic concepts that deals with cohesive failure model. I would also like to know how deltanc, deltatc etc are formulated in this model. Please sugggest.

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