cracks

In this work, we show that the combination of material quenched disorder (of finite strength/amplitude and correlation length) and a 2D tip-splitting instability (that gives rise to extra fracture surfaces) is at the heart of the spatiotemporal dynamics of cracks in 3D. Specifically, it is shown to account for the widely observed limiting (terminal) velocity of cracks, mirror-mist-hackle sequence of morphological transitions, crack macro-branching and a 3D-to-2D transition, out-of-plane crack front waves and the properties of micro-branches.  

Following the previous Blog entry on 3D fracture and out-of-plane crack structures: the essential role of material disorder, we add here a related manuscript (see also attached PDF):

Size selection of crack front defects: Multiple fracture-plane interactions and intrinsic lengthscales

In this pair of preprints (see also attached PDFs):

Quenched disorder and instability control dynamic fracture in three dimensions

Facet formation in slow three-dimensional fracture

Please see the MPIE website for the job description & online application

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

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

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.

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.

http://orbilu.uni.lu/handle/10993/17878

http://hdl.handle.net/10993/17878

Crack Propagation Laws Corresponding to a Generalized EL Haddad Equation
M. Ciavarella

International Journal of Aerospace and Lightweight Structures (IJALS)

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--

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

Scientific Committee: 

We are delighted to invite you to submit your contribution to ISDMM11. The conference will take place in Seville, Spain, June 27 – July 1st 2011.

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