Audrius Jutas Kaunas University of Technology, Lithuania

  • View
    25

  • Download
    1

Embed Size (px)

DESCRIPTION

STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland. Synthesis of physical and mechanical behaviour in metal-matrix materials with heterogeneous microstructure. - PowerPoint PPT Presentation

Text of Audrius Jutas Kaunas University of Technology, Lithuania

  • Synthesis of physical and mechanical behaviour in metal-matrix materials with heterogeneous microstructure Audrius Jutas

    Kaunas University of Technology, Lithuania

    KTU, Faculty of Mechanical Engineering, Department of mechanics of solidsAddress: Kstuio 27, Kaunas LT-3004, LithuaniaTel.:+00-370-7-32-2830, fax.: +00-370-7-32-4108STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • Department of Mechanics of SolidsThe Department was founded in 1920. The material testing laboratory of this department in 1920 met the world standards and was the best in the Baltic countries. The first Lithuanian textbook on strength of materials was published in 1935 (author Prof. K.Vasiliauskas). In September 1, 1993 this department was named as Department of Mechanics of Solids. Its science and studies trends differ from the predecessor by a more expansive curriculum that combines the problems of strength of materials and structures, durability, fracture mechanics, stability, and it is a part of the area of mechanical reliability of structures.

  • Department activity presents11 monographs;9 textbooks; More than 2000 scientific articlesInternational projects Participation in International Scientific OrganizationsEstablishment of Strength and Fracture mechanics centre

  • Staff Age Average of Staff is 38 Years

  • Areas of studies programme in departmentStrength of materials and structures,Mechanics of Materials,Fracture mechanics, Stability,Reliability,Finite Elements

  • I. IntroductionDefects of heterogeneous materials occur at different spatial scales and can have different origin, similar to the corresponding hierarchy of heterogeneous displacement fields caused by lattice defects in the bulk during plastic deformation

    There is important to define how the fundamental knowledge can be joined together with the use of different length scales.

    STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • II. ObjectivesThe aim of the project is to understand the phenomena of deformation behaviour in metal-matrix materials from nano- to macro-scale

    The study should to join the investigations of interfacial or intrinsic phenomena in heterogeneous microstructures, e.g. ferite-perlite microstructures, because these in multifunctional structures are used STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • III. Project realization 1. First stepProblems solving in nano-scale

    2. Second stepProblems solving in micro-scale

    3. Third stepProblems solving in macro-scaleSTEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • First step: Problems solving in nano - scaleA. Clear selection of lattice type

    B. Clear separation of material defects

    C. Clear separation of deformation behavior of latticeSTEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • A. Clear selection of lattice typeE.g.: Ferrite-perlite microstructure of steel AISI1144 STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • B. Clear separation of material defectsDefects that are given after metal alloy fabrication:

    Nano-structural defects (point defects, elastic distortion e.g. near two grain boundary)

    Expected result: Evaluation of defects type and densitySTEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • C. Clear separation of deformation behavior of lattice Atom positions of deformed lattice in elastic state (returnable)

    Atom positions of deformed lattice in an intermediate state (atomic displacements by single dislocations)

    Atom positions of deformed lattice in plastic state (large crystallographic slip steps created by sets of collectively gliding dislocation on parallel or identical glide planes; twins formation) STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • C. Clear separation of deformation behavior of lattice (continued)Expected result:

    Choosing of models for a calculation of lattice deformation

    Assessment of lattice constants, bond energy between the atoms, interatomic force, Burgers vector, shear stress, diffusion and others

    STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • C. Clear separation of deformation behavior of lattice (continued)In conclusions it should be asked:

    What impact mechanism to neighborhood lattice should be proposed?

    What physical and mathematical relationship is between investigated members?

    What members will be used for an assessment of micro-mechanical behavior? STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • 2. Second step: Problems solving in micro-scale How much of different micro-components in calculating volume

    Axes orientation of several grains

    Fine measurement of grain dimensions

    Micro-structural model creation using mean values of grain sizes and axiality STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • Problems solving in micro-scale Expected result:

    Choose the models on micro-structural assessment for calculation of grain deformation

    Evaluation of micro-mechanical behavior using classical (analytics) and modern methods of calculation (software, e.g. ABAQUS)

    Separation analysis of elastic and plastic states in micro-structural components (grains)STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • Problems solving in micro-scaleIn conclusions it should be asked:

    What impact mechanism to neighborhood grain is given?

    What mathematical relationships should be choosing due to deformation of grains?

    What members will be used for an assessment of macro-mechanical behavior?STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • 3. Third step: Problems solving in macro-scale

    Experimental assessment of mechanical properties using stress- strain diagram (pr, e, Y, u, fr, E, Et, Ep, , )STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • Problems solving in macro-scaleExpected result:

    Separation of elastic and plastic macro-mechanical properties of heterogeneous material

    Assessment of strain points at which the global macro-mechanical energy of attraction and repulsion will occur.STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • Problems solving in macro-scaleIn conclusions it should be asked:

    What relationship between nano-, micro- and macro-mechanical behavior?

    What quantitative values are used for step by step assessment due to uniaxial deformation of heterogeneous material?

    What members of different scales could be bridged together? STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • IV. Instruments for project realization1. First stepX-Ray diffraction analysis, Simulation of lattice deformation and calculation

    2. Second stepMicro-structural analysis, measurement of grain size, simulation of grain deformation and calculation

    3. Third stepStress-strain diagram, calculation of macro-mechanical membersSTEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • What changes could be in potential energy U and compressibility 1/E using stress-strain diagram?STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • V. Offered expertiseResearch group from KTU can offer the solutions for formulating and modelling of mechanism of nano - structured materials with metal-matrix STEF-NANO-ACCStimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland

  • VI. Partner search1. Partners in the field of so