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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.

UK Newton Post-Doc Fellowship in Computational Mechanics

 
Dear All,

A new multi-million pound initiative to fund research collaborations and improve links between UK and overseas researchers has been launched.

The Newton International Fellowships aim to attract the most promising, early stage, post-doctoral researchers working overseas, who do not hold UK citizenship, in the fields of humanities, engineering, natural
and social sciences.

MSc+PhD position Fully Funded -- Massively parallel biomechanics simulation of brain surgery on HECToR

High Performance Computing MSc+Ph.D. position available at the
University of Glasgow on Massively Parallel Brain Surgery Simulation
with the extended finite element method (XFEM and FleXFEM)  (University
of Glasgow) -- funding body is EPSRC.

One year MSc in HPC in Edinburgh (all costs covered by funding) + 3 year Ph.D.  and access to HecToR,
one of the world's largest super-computer, including training with
experts in massively parallel simulation (10,000+ processors).

The Paris equation

The  Paris equation should correctly be referred to as the ERDOGAN-PARIS equation, maybe some more names may be needed.

LEFM is a term bandied about in the text books, but very few texts  know how to define what it means and how it applies.

You can take my course.  What happened to the earlier posts about my course.

Anyone who contributes to my DORN-RAJNAK or HARPER DORN will be given credit.

 

Recent paper in Fracture

kfupm.edu.sa/publications/ajse/articles/3318_P.18.pdf

Is the limit of stress intensity factors "1" when the crack length is close to "0"?

I have read some papers about fracture mechanics of functionally graded materials. I find there are different results for the stress intensity factors when the crack length is close to "0" . In some papers the values of stress intensity factors are "1" when the crack length is close to "0" , but in other papers the values of stress intensity factors are not "1". I obtain the stress intensity factors is "1" when the length of crack is close to "0". I hope to get the explaination about the results.Thanks a lot.

Journal Club Forum for April 15th: Fracture of Ferroelectrics

Ferroelectric materials have seen applications as actuators (the fuel injection system in the latest BMWs), sensors (naval sonar systems), and ferroelectric nonvolatile random access memories (FRAMs). For actuators and sensors it is the piezoelectric behavior of these materials that is exploited, while for FRAMs the ability of the material to “switch” polarization states is the essential feature for the application. 

PhD projects in computational fracture and computational/theoretical fluids at University of Melbourne

The Australian Mineral Science Research Institute (AMSRI) is a consortium of Australia's best scientists working in minerals industry-related fields. Research activities span the breadth of minerals processing, with major themes of the research being energy efficiency, frugal water use and efficient management of waste. The Mathematics program of AMSRI performs modelling and analysis research across multiple minerals processing areas, including comminution, flotation and waste treatment.

Li Han's picture

The effect of porosity on the stiffness and fracture energy of brittle organosilicates

Integrating porous low-permittivity dielectrics into Cu metallization is one of the strategies to reduce power consumption, signal propagation delays, and crosstalk between interconnects for the next generation of integrated circuits. However, the porosity and pore structure of these low-k dielectric materials also strongly affects other important material properties besides their dielectric constant.

Masayuki Wakamatsu's picture

Cutting Mica Sheet

Choose a channel featured in the header of iMechanica: 
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Hi iMechanica,

yoursdhruly's picture

Traction separation laws in Cohesive zone models - Some Questions

Hello! 

As a student who has spent a lot of time studying cohesive zone models in fracture mechanics, I have several questions that have bothered me over the past year or so, and I have not been able to find suitable answers to them. I am limiting myself here to questions related to the traction-separation law, which invariably forms the basis of CZM as it is implemented today. I am raising these questions in the hope that I can receive some response here, even if it means my question is invalid (as I suspect a few may be).  So here is my list:

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