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fracture

cracking analyses in a bended sandwich beam

Submitted by Ilias I. Tourl… on
research
fracture
J integral
Energy release rate

I'm studying cracking analyses in a three point loaded specimen of a composed beam.I'm using ANSYS and i want to create codes for estimation of J integral and energy release rate in the vicinity of crack tip.After that i'll calculate the stresses and strains fields,and then i can compare the equivalent fields i retrived using CTOD  and K(I,II,III) factors (according to ANSYS algorithm).

My problem is that I'd like to find a relationship between the above mentioned quantities(J,G)  with K(I,II,III)factors.

Reminder - abstract submission date for 3rd IC Engineering Failure Analysis

Submitted by Dean Eastbury on
conference
fracture
solid mechanics
Fatigue
failure analysis
structural integrity

The abstract submission deadline for this next conference in the biennial Engineering Failure Analysis series (www.icefa.elsevier.com) is 30 November 2007.

The conference will take place in the coastal town of Sitges, just a short distance from Barcelona's international airport, from 13 to 16 July 2008.    

Fracture Simulation Using Discrete Lattice Models

Submitted by Anup S on
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viscoelasticity

I am trying to implement quasi static fracture in a discrete lattice model, with material being viscoelastic. Do i need to use an incremental-iterative method? Please give your suggestions.

Sih's Strain Energy Density Approach in Fracture - why is it not very popular?

Submitted by yoursdhruly on
education
fracture
strain energy density
Sih

Most fracture classes and texts focus on the following different approaches: Griffith's energy approach, Irwin's stress intensity factor approach, the Barenblatt-Dugdale strip yield model (and subsequently, cohesive zone modeling) and Rice's J-Integral approach. As a graduate student studying fracture mechanics, I have often wondered why there seems to be very little discussion in the community with regard to Sih's strain energy density approach. Are there any fundamental limitations to the approach or are there "other" reasons behind this? Your thoughts are appreciated.

State-of-the-art understanding of cracking for porous materials?

Submitted by Al Zappor on
adhesion
fracture
interface
porous
low-k dielectric

It seems there are quite a few experimental studies [1,2] on the fracture properties of porous materials, like nanoporous low-k dielectrics, as a function of porosity. Can anyone point out some references on the theoretical part, like the available models, computational methods or analytical approaches that can capture microstructure information, including porosity, pore geometry etc. Interface delamination of porous materials is also of interest. Thanks.

Peridynamic theory vs. classical continuum theory

Submitted by Biswajit Banerjee on
research
fracture
peridynamic

Dr. Stewart Silling has provided me with a copy of his talk on Peridynamic theory that he presented at McMat 2007.  The PDF file of the talk is attached below.

In order to deal with classical material models and volume constraints, Dr. Silling has modified the original theory to allow for forces that are not necessarily pairwise. A bit on that is included in the talk.

Floating ships of ice and increasing the toughness of glass

Submitted by Rod Ruoff on
research
fracture
toughness
tetrahedral bonding
hydrogen bonding
brittle
order parameter

http://en.wikipedia.org/wiki/Project_Habakkuk

I was surprised several years ago when delving into the literature to not find any references about addition of nanoparticles to ice, to study their impact on the mechanics of ice.  In short, to make nanocomposites where the matrix is ice.  So, with 2 high school students from IMSA, the Illinois Math and Science Academy, we set about (with their limited time for a bit of research) to try adding some nanoparticles to water and to freeze it.  The students simply used their home freezers to do this, and their mechanics measurements were with a hammer and chisel...

Large-scale hierarchical molecular modeling of nanostructured biological materials

Submitted by Markus J. Buehler on
research
fracture
computational mechanics
proteins

There have been several posts recently discussing new directions in computational mechanics. Here is a review article that appeared recently that may be of interest.

Large-scale hierarchical molecular modeling of nanostructured biological materials

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