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saberelarem's picture

On a systematic approach for cracked rotating shaft study: breathing mechanism, dynamics and instability

We present a systematic approach to deal with the modelling and analysis of the cracked rotating shafts behaviour. We begin by revisiting

the problem of modelling the breathing mechanism of the crack. Here we consider an original approach based on the form we give to the energy of the system and then identify

the mechanism parameters using 3D computations with unilateral contact conditions on the crack lips. A dimensionless flexibility is identified which makes the application

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

shreeram111's picture

Crack tip mesh size - Interface cracks ?

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Hello everybody,

                   I am working on FE Simulation of interface cracks. To this end, I use modified VCCT, CSDEM and other such methods to determine mesh independent strain energy release rate (G) and Mode mixity (ψ). Now I have a fundamental doubt.

S. Beretta's picture

Simulation of crack growth in Ni-based single crystals

In a cooperative research between PoliMi and UIUC we have analyzed the crack growth in Ni-based single crystals:

http://www.sciencedirect.com/science/article/pii/S0142112316000840

 Crack growth experiments analyzed with DIC had shown relatively low closure levels respect to polycrystals. Crystal plasticity simulations with WARP3D have been able to simulate closure levels consistent with the experimental ones.

N. Sukumar's picture

Perspective article on the X-FEM in computational fracture

Abstract: In this paper, we provide a retrospective examination of the developments and applications of the extended finite element method (X-FEM) in computational fracture mechanics. Our main attention is placed on the modeling of cracks (strong discontinuities) for quasistatic crack growth simulations in isotropic linear elastic continua.

Case Study: Modelling Ultrasonic Array Response of Real Cracks

Stress corrosion cracks can be a serious problem in many engineering industries, and especially so for critical parts. While an ultrasonic transducer can be used for the non-destructive evaluation of cracks with simple shapes, complex branching cracks, such as stress corrosion cracks, require ultrasonic arrays that consist of multiple transducers and are able to inspect at multiple angles.

News

Hi all,

 

Some news are available at our project blog, check them out at:  http://microlab-m3c4.blogspot.nl/

 

Regards,

Branko

L. Roy Xu's picture

Why fracture and failure mechanics is so important? From Southwest Boeing 737 cracks to future Boeing 787 safety

Even Jay Leno tried to understand fatigue cracks at his Yesterday’s Tonight Show, our research on fracture and failure mechanics is received great attention from the general public. Read more after this photo--

  Southwest jet

 

jsanz's picture

ISDMM11 - Upcoming Abstract Deadline January 30th 2011

5th International Symposium on Defect and Material Mechanics, Seville (Spain), from June 27 to July 1, 2011.

Scientific Committee: 

Massimiliano Gei's picture

4th International Symposium on Defect and Material Mechanics (ISDMM09), TRENTO, July 6th-9th, 2009

The Solid Mechanics group of the University of Trento (Italy) announces ISDMM09, the fourth international meeting devoted to Mechanics of Material Forces, following the workshops held at Kaiserslautern (2003), Symi (2005) and Aussois (2007), and will be held in the alpine city of Trento, Italy, from July 6th to 9th, 2009.

Abstract submission: January 31, 2009

More info: http://portale.unitn.it/events/isdmm09

phunguyen's picture

The eXtended Finite Element Method (XFEM)

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Hello,

The aim of this writting is to give a brief introduction to the eXtended Finite Element Method (XFEM) and investigation of its practical applications.

Firstly introduced in 1999 by the work of Black and Belytschko, XFEM is a local partition of unity (PUM) enriched finite element method. By local, it means that only a region near the discontinuties such as cracks, holes, material interfaces are enriched. The most important concept in this method is "enrichment" which means that the displacement approximation is enriched (incorporated) by additional problem-specific functions. For example, for crack modelling, the Heaviside function is used to enrich nodes whose support cut by the crack face whereas the near tip asymptotic functions are used to model the crack tip singularity (nodes whose support containes the tip are enriched).

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