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fracture mechanics

Bin Liu's picture

Objective Fracture Parameters and a Paradox for Interface Cracks

Due to the oscillatory singular stress field around a crack tip, interface fracture has some peculiar features. This paper is focused on two of them. One can be reflected by a proposed paradox that geometrically similar structures with interface cracks under similar loadings may have different failure behaviors. The other one is that the existing fracture parameters of the oscillatory singular stress field, such as a complex stress intensity factor, exhibit some nonobjectivity because their phase angle depends on an arbitrarily chosen length.

ludovicnoels's picture

PhD position in computational damage mechanics and fracture mechanics

Context

In the context of Belgian research project, the Universite catholique de Louvain, the Universite libre de Bruxelles, and the Universite de Liege are collaborating  to study from the atomic-scale to the macro-scale the thermomechanical failure of a new family of alloys.

PhD opportunity

Which theory Abaqus' Contour Integral for the determination of SIFs is based on?

I am actually using Abaqus' Contour Integral for the determination of stress intensity factors. But I do not know, which theory it is based on. Is it the same like the path-independent determination of J integral? Or is there a difference?

Rashid K. Abu Al-Rub's picture

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

Symposium on Atomistic and Mesoscale Aspects of Fracture and Fatigue

 

I would like to point you to the 

Mini symposium at the 14th International Conference on Fracture Rhodes, June 18-23 2017

on Atomistic and Mesoscale Aspects of Fracture and Fatigue

Chair: Prof. Peter Gumbsch, Karlsruhe Institute of Technology & Fraunhofer IWM, Germany

Co-chair: Dr Gianpietro Moras, Fraunhofer IWM, Germany

Chao Chen's picture

Flaw sensitivity of highly stretchable materials

Elastomers and gels can often deform multiple times their original length. The stretchability is insensitive to small cuts in the samples, but reduces markedly when the cuts are large. This work shows that this transition occurs when the depth of cut exceeds a material-specific length, defined by the ratio of the fracture energy measured in the large-cut limit and the work to rupture measured in the small-cut limit.  This conclusion generalizes a result in the fracture mechanics of hard materials.

surendran47's picture

Stress intensity factor

Hi I have long been looking for a clear way of defining stress intensity factors. Apart from the usual bookinsh definitions such as "strength of singularity" "state of stress". Of course I could convince myself by relating SIF with Strain Energy Release Rate (G) as 'G' has a more convincing physical meaning explained through the creating of new surfaces. This kind of gives the feeling that 'K' is a derived quantity in the field of fracture mechanics.

So is there a better way of explaining SIF without having to go through 'G'.

marco.paggi's picture

Mini-symposium at ICF14 on "Fracture and contact in multiphysics problems: from energy to biological applications"

Dear Colleague,

I kindly inform you that, in the framework of the 14th International
Conference on Fracture (ICF14), to be held in Rhodes, Greece, June 18-23,
2017, we are organizing a mini-symposium on "Fracture and contact in
multiphysics problems: from energy to biological applications".

If you are interested, please submit your two-page abstract through the
ICF14 website (www.icf14.org) by October 31, 2016, selecting our
mini-symposium.

Rashid K. Abu Al-Rub's picture

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

Localized compliance with Castigliano's theorem

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I'm attempting to compile a local compliance matrix using Castigliano's theorem as described here. I'm having trouble with it and attempted to do a simple example by hand and picked the double cantilever beam specimen and analyzed it with Euler-Bernoulli beam theory (attached). Despite my best efforts, I can't reproduce the correct answer using the theorem as is but only if I modify the limits of integration.

PostDoc in high performance composite materials

The FHNW University of Applied Sciences and Arts Northwestern Switzerland includes nine schools with more than 10’000 students. The School of Engineering is specialized in practice-oriented education, continuing education, applied research and development, and advisory services. We are looking for you to join the School of Engineering, Institute of Polymer Engineering, in Windisch, Switzerland, at the earliest possible date:

PostDoc / Senior Research Engineer (m/f) high performance composite materials

Emilio Martínez Pañeda's picture

On fracture in finite strain gradient plasticity

I hope some of you - particularly those working on strain gradient plasticity or damage and fracture modeling - find this work interesting. 

On fracture in finite strain gradient plasticity

http://www.sciencedirect.com/science/article/pii/S074964191500162X

(A pre-print version is available at www.empaneda.com)

Shuman_Xia's picture

High damage tolerance of electrochemically lithiated silicon

Wang, X. et al. High damage tolerance of electrochemically lithiated silicon. Nature Communications 6:8417 doi: 10.1038/ncomms9417 (2015).

Abstract

Fracture mechanics of shape memory alloys: review and perspectives

Shape memory alloys (SMAs) are intermetallic alloys displaying recoverable strains that can be an order of magnitude greater than in traditional alloys due to their capacity to undergo a thermal and/or stress-induced martensitic phase transformation. Since their discovery, the SMA industry has been dominated by products for biomedical applications with geometrically small feature sizes, especially endovascular stents.

Bin Liu's picture

The surface-forming energy release rate based fracture criterion for elastic-plastic crack propagation and interpretation on paradox of Rice

The J-integral based criterion is widely used in elastic-plastic fracture mechanics. However, it is not rigorously applicable when plastic unloading appears during crack propagation. One difficulty is that the energy density with plastic unloading in the J-integral cannot be defined unambiguously.

Tine van Nunen's picture

Job Opportunity Saint-Gobain R&D Center - Senior Research Engineer

Saint-Gobain job opportunity:

Senior Research Engineer I

Competency Research Labs – Engineering Mechanics

Saint-Gobain R&D Center, Northboro, Massachusetts, USA

Reference number: 522087

Apply online for this job or check out our other career opportunities!

www.saint-gobain-experience.com/en/career-opportunities

WHO WE ARE:

marco.paggi's picture

MUSAM - Multi-scale Analysis of Materials - Annual report 2014

Dear Colleague,

 

I would like to inform you that the annual report on the scientific and educational activities carried out by the research unit MUSAM on Multi-scale Analysis of Materials at IMT Lucca during 2014 can be downloaded from the following link:

 

Load Displacement curve for XFEM in ABAQUS

I am using Maxps Damage criteria for an XFEM crack for a three point bending case. I am using displacement loading on the specimen and wish to plot reaction load v/s mouth opening displacement. I would like to know how to obtain the crack tip opening displacement in ABAQUS. All the journal papers I read show a slump in reaction force after the crack starts to propagate. I plot the results and contour plots show me clearly that the crack has started to propagate. Please help.

wvmars's picture

Engineering Analyst position with focus on FEA, elastomers, and fatigue life prediction

Endurica, LLC is a growing software and consulting services company headquartered in Findlay, Ohio, USA. The
company develops and sells solutions that enable customers to manage durability of elastomeric products. Our
physics-based solutions include computer-aided engineering software that numerically simulates the fatigue life
of elastomeric products, a materials characterization service, and project-oriented consulting services. Our
software is distributed globally in partnership with Dassault Systemes.

marco.paggi's picture

Post-doc position on computational mechanics at IMT Lucca

A new post-doc position (1 year renewable up to 3 years, till the end of the ERC Starting Grant Project CA2PVM, http://musam.imtlucca.it/CA2PVM.html ) is open in the Research Unit MUSAM - Multi-scale Analysis of Materials ( http://musam.imtlucca.it ) directed by Prof.

Emilio Martínez Pañeda's picture

Numerical analysis of quasi-static fracture in functionally graded materials

This work investigates the existing capabilities and limitations in numerical modeling of fracture problems in functionally graded materials (FGMs) by means of the well-known finite element code ABAQUS. Quasi-static crack initiation and growth in planar FGMs is evaluated. Computational results of fracture parameters are compared to experimental results and good agreement is obtained. The importance of the numerical fit of the elastic properties in the FE model is analyzed in depth by means of a sensitivity study and a novel method is presented.

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