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Molecular dynamic simulations of brittle-ductile behaviour of microcracks in 2D and 3D

Project goals

The project is motivated by efforts to understand the brittle-ductile behaviour of crystalline materials. Molecular dynamic simulations of 2D and 3D problems with various loading will be utilized to study: the brittle (fast) and the ductile (slow) microcrack growth accompanied by dislocation emission, further twinning and microcrack nucleation at twins. This will be accompanied by stress calculations on atomic level to find the stress criteria for the brittle or ductile behaviour. We plan also to studythe kinetics and acoustic emission during the processes. Modelling will be oriented mainly to alpha-iron, the basic component to ferritic structural steels.

Keywords

brittle ductile behaviorbcc iron

Public support

  • Provider

    Academy of Sciences of the Czech Republic

  • Programme

    Grants of distinctly investigative character focused on the sphere of research pursued at present particularly in the Academy of Sciences of the Czech Republic

  • Call for proposals

    Výzkumné granty 2 (SAV02002-AB)

  • Main participants

    Ústav termomechaniky AV ČR, v. v. i.

  • Contest type

    VS - Public tender

  • Contract ID

Alternative language

  • Project name in Czech

    Simulace křehce-tvárného chování mikrotrhlin metodou molekulární dynamiky v 2D a 3D úlohách

  • Annotation in Czech

    Projekt je motivován snahami pochopit křehce-tvárné chování krystalických látek. V atomárních simulacích metodou molekulární dynamiky při různých podmínkách zatížení ve 2D a 3D úlohách budou studovány: křehký (rychlý) či tvárný (pomalý) růst mikrotrhlins doprovodnou emisí dislokací, dále dvojčatění a nukleace mikrotrhlin na dvojčatech. Tyto simulace budou doprovázeny výpočty napětí na atomární úrovni. Tento postup umožňuje zajišťovat napěťová kriteria pro křehké a tvárné chování a sledovat též kinetikurůstu defektů a akustickou emisi při těchto procesech. Modelování bude zaměřeno hlavně na alfa-železo, které tvoří základ feritických konstrukčních ocelí.

Scientific branches

  • R&D category

    ZV - Basic research

  • CEP classification - main branch

    JG - Metallurgy, metal materials

  • CEP - secondary branch

    JL - Fatigue and fracture mechanics

  • CEP - another secondary branch

    BM - Solid-state physics and magnetism

  • 10302 - Condensed matter physics (including formerly solid state physics, supercond.)
    20306 - Audio engineering, reliability analysis
    20501 - Materials engineering

Completed project evaluation

  • Provider evaluation

    V - Vynikající výsledky projektu (s mezinárodním významem atd.)

  • Project results evaluation

    Molecular dynamic simulations and stress calculations show that brittle or ductile behavior of microcracks in bcc iron depends on stress distribution, further on mutual crack orientation and available slip system, temperature and loading rate.

Solution timeline

  • Realization period - beginning

    Jan 1, 2002

  • Realization period - end

    Jan 1, 2005

  • Project status

    U - Finished project

  • Latest support payment

Data delivery to CEP

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

  • Data delivery code

    CEP06-AV0-IA-U/04:2

  • Data delivery date

    Sep 26, 2007

Finance

  • Total approved costs

    2,918 thou. CZK

  • Public financial support

    1,108 thou. CZK

  • Other public sources

    1,723 thou. CZK

  • Non public and foreign sources

    87 thou. CZK

Basic information

Recognised costs

2 918 CZK thou.

Public support

1 108 CZK thou.

37%


Provider

Academy of Sciences of the Czech Republic

CEP

JG - Metallurgy, metal materials

Solution period

01. 01. 2002 - 01. 01. 2005