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The 2nd Sandia Fracture Challenge is here!

update, 6/15/2014: Please find revised info packet attached ("SFC2-challenge-v5.ppt")
1. The deadline is extended to October 1st . Hopefully this additional month enables better contributions. This extended deadline is firm.
2. Several groups have asked if they can use existing published information in addition to the material property data provided: yes, this is allowed.
3. Please use the updated information packet attached (“…v5.ppt”) All updates are in red:
a. Slide 2 deadline & ethics statement
b. Slide 3 plate thickness tolerance and Questions 3&4
c. Slide 5, 6, 12, & 19: plate thickness tolerance
d. Slide 8: pin diameter
e. Slide 12: corrected hourglass radius
f. Slide 14: important: all embedded tensile data files: column with force in Newtons

Call for abstracts: “Issues in computational modeling of damage, fracture and fragmentation of solid materials”

As part of the 51st Annual Technical Meeting of the Society of Engineering Science (SES 2014) to be held at Purdue University, West Lafayette, IN, on October 1-3 2014, it is our pleasure to invite you to submit an abstract to the Symposium “Issues in computational modeling of damage, fracture and fragmentation of solid materials”.

What are the regular iteration steps of cohesive model based FEM for crack problems


         I'm now start to learn cohesive zone model based FEM for crack problems. According the a regular coehsize model (bilinear for example), the relative displacement and the cohesive stress are both unknwon, so iteration is required. My question is that what are the regular iteration steps?



Symposium on Structure, Plasticity and Fracture of Inorganic Glasses in Paris

Dear Colleagues,

we are organizing a symposium on Plasticity and Fracture in Inorganic Amorphous Materials at 

Condensed Matter in Paris 2014

to be held August 23 to 29, 2014. 

Your experimental or theoretical contributions are highly welcome. 
Please don't hesitate to contact us for more information.

The deadline for abstract submission is  April 1st 2014.

Looking forward to seeing you in Paris in August,

Jean-Pierre Guin, Etienne Barhel and Erik Bitzek

Grants for 3rd International Workshop on Physics Based Material Models and Experimental Observations Cesme/Turkey 2-4 June

In 2012 and 2013 we organized very successful Workshops on
"Physics-based material models and experimental observations" funded
by the European Union's Enlargement programme. We cordially invite you to
submit an abstract to the 3rd International Workshop on Physics Based
Material Models and Experimental Observations
to be held on 2-4 June
2014 in Cesme-Izmir/Turkey.

MM&FGM14: 13th International Conference on Multiscale Modeling and Functionally Graded Materials

Dear Colleagues,

Please consider submitting an abstract to the 13th Internation conference on Multiscale Modeling and Functionally Graded Materials to be held on October 19-22, 2014; in  Taua Resort, SP, Brazi. More information about the conference could be found here:





1st invitation to VAL 2015 conference discussing effects of variable amplitude loading

Dear iMechanicians,

Let me invite you the 3rd International Conference on Material and Component Performance under Variable Amplitude Loading (VAL 2015) taking place in Prague, Czech Republic in March 23-26, 2015. See the details on its website

The conference will discuss among others these primary questions:

Amir Abdollahi's picture

Three-dimensional simulation of crack propagation in ferroelectric polycrystals: Effect of combined toughening mechanisms

We simulate the fracture processes of ferroelectric polycrystals in
three dimensions using a phase-field model. In this model, the grain
boundaries, cracks and ferroelectric domain walls are represented in a
diffuse way by three phase-fields. We thereby avoid the difficulty of
tracking the interfaces in three dimensions. The resulting model can
capture complex interactions between the crack and the polycrystalline
and ferroelectric domain  microstructures. The simulation results show
the effect of the microstructures on the fracture response of the
material. Crack deflection, crack bridging, crack branching and
ferroelastic domain switching are observed to act as the main fracture
toughening mechanisms in ferroelectric polycrystals. Our fully 3-D

17 th National Congress on Theoretical and Applied Mechanics June 15-20 (Michigan State University)

Dear all,

I would like to bring to your attention the following minisymposium that is organized as part of the NCTAM 17 (Michigan State University, June 15-20, 2014)


Friction, Adhesion and Fracture: From microscale physics to macroscale response

PhD Position in Fracture Mechanics at the Norwegian University of Science and Technology (NTNU)

The Faculty of Engineering Science and Technology (IVT) at the Norwegian University of Science and Technology (NTNU) announces one vacant PhD position in the field of Fracture of Ni-alloys.

ESIS TC4 2014 - Abstract deadline reminder: 25 October 2013

7th International Conference on Fracture of Polymers, Composites and Adhesives - 14-18 September 2014, Eurotel Victoria, Les Diablerets, Switzerland

We are looking for both experimetal and analytical work, in order to give a balanced view of the subject areas:
- Polymers
- Application of fracture mechanics
- Adhesives
- Composites

For more information or to submit your abstract, go to  



7th International Conference on Fracture Mechanics - Call for Abstracts: deadline 25 October

The 7th International Conference in the series will take place once again at Les Diablerets, in Switzerland on 14-18 September 2014.

It organised by the European Structural Integrity Society - Technical Committee 4 on Fracture Mechanics related to Polymers, Polymeric Composites and Adhesives. To submit your abtract, go to

Amir Abdollahi's picture

Conducting crack propagation driven by electric fields in ferroelectric ceramics

This is a recent article in Acta Materialia on the propagation of conducting cracks in ferroelectric ceramics

Title: Conducting crack propagation driven by electric fields in ferroelectric ceramics

Authors: Amir Abdollahi and Irene Arias, Universitat Politecnica de Catalunya (UPC), Barcelona


Postdoctoral Position in Hydraulic Fracture Mechanics Available at Masdar Institute in Abu Dhabi

Postdoctoral Research Fellow position in hydro-fracturing (fracking) is
available immediately at Masdar Institute of Science and Technology in Abu
Dhabi in United Arab Emirates. Masdar Institute is established in collaboration
with Massachusetts Institute of Technology. The research project focuses on
using advanced computational fracture and damage mechanics for simulating
hydro-fracturing of rocks in hydrocarbon fields. The candidate is expected to
have a PhD in the field of geomechanics, or civil engineering with solid
knowledge of hydraulic fracture mechanics and excellent theoretical and

Use Vumat to simulate the hot ductile fracture criterion of Freudenthal

Dear everybody,
I have just studied Abaqus and would like to use Vumat to simulate the hot ductile

fracture criterion of Freudenthal which have the equation: D=integral(0-fracture strain)

of (Smises stress)*d(strain). The fracture will be appear when I reach 1 unit.
Could you please show me how to write algorithm adding temperature to calculate (D) and

out put (D) in Vumat.

thanks you so much

I am looking forward to hearing from you


Konstantin Volokh's picture

Crack thickness

cracks do not appear as a result of an ideal separation of two adjacent atomic
layers. Just the opposite, cracks appear as a result of the development of
multiple micro-cracks triggered by the massive breakage of atomic bonds. The microcracking
and the bond breakage are not confined to two neighbor atomic planes: the
process involves thousands atomic planes within the representative characteristic
volume of size h
. This size defines the width (not the lenth) of the damage
localization zone and it can be called the crack thickness. The knowledge of

Lattice Modeling of Chloride Diffusion in Sound and Cracked Concrete

Our paper titled "Lattice modeling of chloride diffusion in sound and cracked concrete" has been accepted for publication by Cement and Concrete Composites journal. It deals with numerical modeling of chloride transport coupled with fracture. Registered subscribers can download the paper at .

Why not Gurson-Tvergaard-Needleman void growth model for plate impact simulations?

Can someone answer me if Gurson-Tvergaard-Needleman void growth model is not suitable for flyer-plate impact simulations? I have come across some papers who have derived void growth equations to simulate fracture in ductile mateials like OFHC copper etc., subject to plate impact (uniaxial strain high strian rate loading). I have attached 3 of them. But none of them have used Gurson's yield function. I did not find any explanation if GTN model has any drawbacks in simulating spallation phenomena found in plate impact simulations.


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