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fracture mechanics

Automatic failed element removal

Hi every one,

I think that there is a method for automatic failed element removal  using UMAT subroutine, I mean that at every iteriation failed elements with the help of a failure criterion to be indicated and to its material behaviour to set to zero and this means that a path for crack propagation will form .... Anyway, if any body is intrested we can clarify this subroutine step by step for all of the visitors in this website, I mean that an open source subroutine to be expanded here.

Thank you,

Rebecca Janisch's picture

Open Position in Micromechanical Modelling at ICAMS

The Ruhr University Bochum, Germany, invites applications for a PhD / PostDoc position at the Interdisciplinary Centre for Advanced Materials Simulation (ICAMS).

X-FEM implementation in Abaqus

Dear all,

Just in case it is of interest to some of you, we provide links to three postprints related to our Abaqus implementation of the X-FEM. The latest is an "article in press" in Eng Frac Mech where we explain the essentials of the implementation and provide a link to the source code for the Abaqus computation. Note that the implementation is limited to 2D and the pre-processing code needed for element subdivision is not provided.

Postdoctoral and Ph.D. positions in Experimental Solid Mechanics at Michigan State University

Composite Vehicle Research Center (CVRC) at MSU has an immediate opening for a postdoctoral research associate to conduct research in non-destructive evaluation (NDE) and structural health monitoring (SHM) of composite materials in an effort to develop self-diagnostic composite structures for air and ground vehicles. 
http://www.egr.msu.edu/~shong/Postdoc.html

Harold S. Park's picture

Keynote Lecture by Prof. Ted Belytschko at 2008 ASME IMECE in Boston

I would like to invite everyone attending the 2008 ASME IMECE next week in Boston to attend a keynote lecture given by Prof. Ted Belytschko of Northwestern University.  The lecture will occur at 1:45 PM on Tuesday, November 4, and will be entitled "Multiscale Computations of Fracture - When Does Flaw Tolerance Occur?" 

Further information on Prof. Belytschko's talk can be found here: 

http://www.asmeconferences.org/Congress08/PlenarySessions.cfm

mesh refinement for eigen-properties of a cracked body

 It is a common technique in modelling cracked bodies with finite element method, to refine the mesh near the crack tip. It is mentioned in text books, mesh refinement is nessecary to increase the acuuracy of the computed stress intensity factor for the crack tip. Is meshrefinement nessecary for computing eigen-properties ( natural frequencies and natural modes ) as well as SIF? or eigen properties are not affected much by the near crack tip field?

Andrew Bunger's picture

Postdoctoral Fellowship studying mechanics of hydraulic fracturing for stimulation of hot fractured rock geothermal reservoirs

CSIRO Petroleum in Melbourne, Australia, welcomes applications to a Postdoctoral Fellowship
in hydraulic fracture stimulation mechanics. The successful candidate
will have a background in applied mechanics and numerical methods with
an interest in verifying numerical calculations by experiment.  The
research results will be applied to stimulation of hot fractured rock
geothermal reservoirs.

32nd Annual Adhesion Society Meeting February 15-18, 2009

The Adhesion Society will hold its 32nd Annual Meeting in Savannah, GA February 15-18, 2009; uniting chemists, physicists, mechanists, engineers, and biologists concerned with the design and characterization of materials interfaces and their associated property of adhesion.  Adhesion and interfacial constrol are key to the development of nano- and bio- based technologies as well structural and cosmetic applications that influence society in everyday life. 

On Mechanistic Approach to Modelling R-Curve Behaviour

As a follow up to my first blog , I would like to know if the experimental data of applied loads and crack sizes or lengths, are sufficient to model the R-curve behaviour via the Fracture Mechanics approach.

Openings in Computational Geomechanics and Rock Physics at ExxonMobil

ExxonMobil Research and Engineering Company has immediate openings in Computational Geomechanics and Rock Physics at its Corporate Strategic Research Laboratory in Annandale, NJ. 

To be considered, applicants must satisfy the requirements described in the attached flyer and submit a cover letter and resume directly to the ExxonMobil website (www.exxonmobil.com/ex).

Dean Eastbury's picture

5th IC on Fracture of Polymers, Composites and Adhesives - just 4 weeks to go!

The 5th International Conference on Fracture of Polymers, Composites and Adhesives will be held in the beautiful Alpine village of Les Diablerets, Switzerland, 7-11 September. Les Diablerets is situated 120 km from Geneva's international airport and is easily reached either by car or by public transport.

The full oral and poster programs, as well as registration details can be found on the conference website at www.tc4pca.elsevier.com

Crack Propagation in Contact Fatigue

are there any codes available for the crack propagation under fatigue loading? taking into consideration the contact between the crack faces.

Gradient based cohesive zone models

Hello,

Strain gradient based (non-local) plasticity and damage models have been studied quite extensively in the literature.

 I was wondering if anyone has experience in the development of cohesive zone models that obtain the tractions in front of crack tip not only as a function of the diplacement jump, but also as a function of the gradient of displacement jump.

 If yes, can you please point me to the reference?

Dean Eastbury's picture

Issue 2 of J. Mechanical Behavior of Biomedical Materials published

I am pleased to announce that Volume 1, Number 2 of the the recently-launched Journal of the Mechanical Behavior of Biomedical Materials (www.elsevier.com/locate/jmbbm) has been published by Elsevier. All JMBBM articles can be accessed free-of-charge on ScienceDirect until September 2008 (http://www.sciencedirect.com/science/journal/17516161).

EM388F Term Paper: Finite Element MEthod in Fracture Mechanics

Early applications of the finite element method to crack problem was
developed by Swedlow and et al. Even though they could get reasonable
accuracy about 5 to 10%, later study showed that solutions in the
vicinity of the crack tip cannot be guranteed to be accurate regardless
of the mesh density around tip. In order to overcome this problem,
people developed special crack tip elements.

In this term paper, I'm going to present 1) Finite Element Method in
Fracture Mechanics and 2) NewFinite Element technique so called Extended Element Method.

EM 388F Term Paper: Application of Fracture Mechanics on Cortical Bone Studies

One of the most common problems in older people is the fragility of the bones. Human bones are prone to fracture, and fracture of certain bones in the body such as the cortical bone may be fatal. Understanding of the fracture mechanism of bones is essential for the medical profession, and plays a major role in the study of osteoporosis as well.  

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