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▶ Research Topic

  • Mission: Intellect design of novel material-processing-function by multi-scale Modelling
  • Materials: Nano, ultrafine, porous, powder, amorphous, glasses and composite metallic materials
  • Application: Ultrahigh strength steel, light alloy Ti & Mg, B10 mechanics, MEMS, energy parts
Research Topic
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▶ Plasticity Theory of Porous Materials

Plasticity Theory of Porous Materials
  • Development of pressure-dependent constitutive models (Lee-Kim Yield Model
  • FEM of powder forming: isostatic pressing, compaction, powder forging, powder extrusion
  • FEM of sintering: densification, grain growth
  • Prediction of forming limit and strength of porous materials
  • Bulk forming of nanocrystalline powders: cold sintering, high speed forming, spark plasma sintering
  • Development of densification mechanism maps
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▶ Nano Mechanics & Nanoindentation

Nano Mechanics & Nanoindentation
  • Development of nano mechanics model (KEB Creep Mocel)
  • Unified model for deformation of nano/micro/meso scale materials (Phase mixture model)
  • Modeling strength and ductility of nanocrystalline materials
  • Strategy development for achieving both strength and high ductility
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▶ Deformation Mechanism Map for Nanostructured Materials

Deformation Mechanism Map for Nanostructured Materials
  • New unified deformation mechanism map of stress, strain rate, temperature and grain size axis
  • Understanding abnormal behavior in nano materials
  • Database and software development for the unified deformation mechanism map
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▶ Modeling of Metastable/Amorphous/Quasicrystalline Material

▶ Modeling of Metastable/Amorphous/Quasicrystalline Material
  • Strengthening model for devitrified amorphous nanocomposites (Phase mixture strengthening model)
  • Ductile-brittle transition model for partially devitrified amorphous alloys
  • Bulk forming of Al-Ni-Mn amorphous powders
  • Micro/nano forming in supercooled liquid region
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▶ Nano SPD (Severe Plastic Deformation) Processing

Nano SPD (Severe Plastic Deformation) Processing
  • ECAP (Equal Channel Angular Pressing) simulation
  • HPT (High Pressure Torsion) simulation
  • Microstructural evolution prediction (Dislocation cell model): grain size, misorientation angle
  • Distribution function modelling by statistical theory
  • New process development for industrialization: continuous process, combined process
  • Process optimization by CAE (Computer Aided Engineering)
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▶ Multi-Scale Simulation: FEM + Atomic simulation

Multi-Scale Simulation: FEM + Atomic simulation
  • Finite element method constitutive model development
  • Crystal plasticity and texture simulation
  • Fully coupled deformation-temperature-phase transformation simulation
  • Heat transfer modeling
  • Electric field-Joule heating simulation
  • Indentation and gradient plasticity theory
  • Semiconductor & Micro-forming: MEMS, Forcefielling
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▶ CNT (Carbon Nanotube)-Metal Nanocomposite

CNT (Carbon Nanotube)-Metal Nanocomposite
  • Theoretical modeling of CNT
  • Continuum-Atomistic multi-scale modeling
  • CNT-reinforced metal matrix nanocomposite
  • Alignment control of nanocomposite
  • Electric properties of CNT nanocomposite
  • Application of CNT nanocomposite: mechanical, electrical & medical components
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▶ MEMS (Micro-Electro-Mechanical Systems) Part

MEMS (Micro-Electro-Mechanical Systems) Part
  • Nano/Micro forming simulation and optimization
  • Ink-jet nozzle development
  • Super precision die & mold design
  • Micromachine & Microgeared motor
  • High sensitivity coriolos flowmeter & pressure sensor
  • Hollogram reflection grating
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▶ Nano Ultra High Strength Steel

Nano Ultra High Strength Steel
  • Strengthening model for devitrified amorphous nanocomposites (Phase mixture strengthening model)
  • Ductile-brittle transition model for partially devitrified amorphous alloys
  • Bulk forming of Al-Ni-Mn amorphous powders
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▶ Bio Mechanics

Bio Mechanics
  • Tissue modeling and sensor development
  • Porous bone structure modeling
  • Implant material and structure design
  • Static/dynamic, texture aniotropy and asymmetric behavior simulation
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