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Audrius Jutas Kaunas University of Technology, Lithuania

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.

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Audrius Jutas Kaunas University of Technology, Lithuania

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  1. 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 Audrius Jutas Kaunas University of Technology, Lithuania KTU, Faculty of Mechanical Engineering, Department of mechanics of solids Address: Kęstučio 27, Kaunas LT-3004, Lithuania Tel.:+00-370-7-32-2830, fax.: +00-370-7-32-4108

  2. Department of Mechanics of Solids • The 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.

  3. Department activity presents • 11 monographs; • 9 textbooks; • More than 2000 scientific articles • International projects • Participation in International Scientific Organizations • Establishment of Strength and Fracture mechanics centre

  4. StaffAge Average of Staff is 38 Years

  5. Areas of studies programmein department • Strength of materials and structures, • Mechanics of Materials, Fracture mechanics, • Stability, • Reliability, • Finite Elements

  6. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland I. Introduction • Defects 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.

  7. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland II. Objectives • The 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

  8. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland III. Project realization 1. First step Problems solving in nano-scale 2. Second step Problems solving in micro-scale 3. Third step Problems solving in macro-scale

  9. STEF-NANO-ACC Stimulating, 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 - scale A. Clear selection of lattice type B. Clear separation of material defects C. Clear separation of deformation behavior of lattice

  10. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland A. Clear selection of lattice type E.g.: Ferrite-perlite microstructure of steel AISI 1144

  11. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland B. Clear separation of material defects Defects 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 density

  12. STEF-NANO-ACC Stimulating, 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)

  13. STEF-NANO-ACC Stimulating, 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, Burger’s vector, shear stress, diffusion and others

  14. STEF-NANO-ACC Stimulating, 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?

  15. STEF-NANO-ACC Stimulating, 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

  16. STEF-NANO-ACC Stimulating, 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)

  17. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland Problems solving in micro-scale In 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?

  18. STEF-NANO-ACC Stimulating, 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, , )

  19. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland Problems solving in macro-scale Expected 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.

  20. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland Problems solving in macro-scale In 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?

  21. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland IV. Instruments for project realization 1. First step • X-Ray diffraction analysis, Simulation of lattice deformation and calculation 2. Second step • Micro-structural analysis, measurement of grain size, simulation of grain deformation and calculation 3. Third step • Stress-strain diagram, calculation of macro-mechanical members

  22. STEF-NANO-ACC Stimulating, 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?

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

  24. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland VI. Partner search 1.Partners in the field of solid state physics to realize the investigation of nano - scale atom structures (complex lattice deformation, X-ray diffraction); 2. Partners in the field of materials engineering (investigations of microstructure) 3. Partners in the field of application of computational methods (obtain the results of simulation by suggested algorithm)

  25. STEF-NANO-ACC Stimulating, Encouraging and Facilitating the Participation of ACC Nanotechnology and Nanoscience Research Organizations To FP6 March 23, 2005, Warsaw, Poland Thank You for Your attention! KTU, Faculty of Mechanical Engineering, Department of mechanics of solids Address: Kęstučio 27, Kaunas LT-3004, Lithuania Tel.:+00-370-7-32-2830, fax.: +00-370-7-32-4108

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