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microKIc SIGNED

Microscopic Origins of Fracture Toughness

Total Cost €

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EC-Contrib. €

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Partnership

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 microKIc project word cloud

Explore the words cloud of the microKIc project. It provides you a very rough idea of what is the project "microKIc" about.

model    criteria    dislocation    coupled    refractory    resistant    guidelines    brittle    simulations    dislocations    tip    front    components    perform    precipitates    beam    mechanics    fracture    boundaries    milling    semiconductors    microstructure    plasticity    multiscale    micromechanical    framework    discrete    nucleation    voids    systematically    tips    models    dynamics    microstructural    ultimate    mechanistic    interactions    obstacles    steels    3d    ion    initiation    crack    resistance    constituents    microkic    varying    materials    physics    validated    orientation    safety    tests    dependence    finite    cracks    atomistic    sufficiently    toughness    metals    propagation    calibration    temperature    first    tested    nial    predict    gain    sensitive    microscopic    phenomenological    bcc    semi    mechanical    specimens    experimental    arrest    quality    macroscopic    undoubtedly    grain    time    situ    micro    experiments    regarded    structures    strain    material    rate    experimentally    code    predictive    kic    structural    mesoscale   

Project "microKIc" data sheet

The following table provides information about the project.

Coordinator
FRIEDRICH-ALEXANDER-UNIVERSITAET ERLANGEN NUERNBERG 

Organization address
address: SCHLOSSPLATZ 4
city: ERLANGEN
postcode: 91054
website: www.uni-erlangen.de

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Total cost 1˙996˙570 €
 EC max contribution 1˙996˙570 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-COG
 Funding Scheme ERC-COG
 Starting year 2017
 Duration (year-month-day) from 2017-05-01   to  2022-04-30

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    FRIEDRICH-ALEXANDER-UNIVERSITAET ERLANGEN NUERNBERG DE (ERLANGEN) coordinator 1˙699˙175.00
2    CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS FR (PARIS) participant 297˙395.00

Map

 Project objective

The resistance to crack propagation is undoubtedly one of the most important properties of structural materials. However, our current mechanistic understanding of the fracture processes in typical semi-brittle materials like steels, refractory metals or semiconductors is not sufficiently advanced to predict the fracture toughness KIc and its dependence on the microstructure, temperature and strain rate. Therefore, KIc is commonly regarded as a phenomenological material parameter for fracture mechanics models that require experimental calibration.

The aim of microKIc is to study fracture in model materials in order to gain a detailed understanding of the microscopic crack-tip processes during fracture initiation, propagation and arrest, and to systematically study the interactions of cracks with constituents of the microstructure like dislocations, voids, precipitates and grain boundaries. To this end, we will perform fully 3D, large-scale atomistic simulations on cracks in bcc-based materials (W, NiAl) with varying crack orientation, crack front quality, and in the presence of dislocations and microstructural obstacles. The obtained criteria for crack advance and dislocation nucleation at crack tips will be implemented in a coupled finite element - discrete dislocation dynamics code, which will allow for the first time a fully 3D study of fracture and crack-tip plasticity at the mesoscale. The simulations will be compared to in-situ micro-mechanical tests on well-characterized fracture specimens produced by focused ion beam milling.

The ultimate goal of microKIc is to use this experimentally validated multiscale modelling framework to develop a microstructure-sensitive, physics-based micromechanical model of the fracture toughness, which will be tested against macroscopic fracture experiments. Such predictive models are crucial for the development of new failure-resistant materials and for improved design guidelines for safety-relevant structures and components.

 Publications

year authors and title journal last update
List of publications.
2019 Eva I. Preiß, Hao Lyu, Jan P. Liebig, Gunther Richter, Florentina Gannott, Patric A. Gruber, Mathias Göken, Erik Bitzek, Benoit Merle
Microstructural dependence of the fracture toughness of metallic thin films: A bulge test and atomistic simulation study on single-crystalline and polycrystalline silver films
published pages: 3483-3494, ISSN: 0884-2914, DOI: 10.1557/jmr.2019.262
Journal of Materials Research 34/20 2020-01-29
2018 Johannes J. Möller, Erik Bitzek, Rebecca Janisch, Hamad ul Hassan, Alexander Hartmaier
Fracture ab initio: A force-based scaling law for atomistically informed continuum models
published pages: 3750-3761, ISSN: 0884-2914, DOI: 10.1557/jmr.2018.384
Journal of Materials Research 33/22 2019-04-18

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