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LSN02 - Multiscale Metals Modeling Bridge 12 = FEA ISV...

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Macroscale ISV Continuum Bridge 1 = Interfacial Energy, Elasticity Atomistics (EAM,MEAM,MD,MS, Nm Bridge 2 = Mobility Bridge 3 = Hardening Rules Bridge 4 = Particle Interactions Bridge 5 = Particle- Void Interactions Void \ Crack Interactions Bridge 11 = FEA ISV Bridge 12 = FEA Dislocation Dynamics (Micro-3D) 100’s Nm Electronics Principles (DFT) Å Crystal Plasticity (ISV + FEA) 10-100 µm Crystal Plasticity (ISV + FEA) µm Crystal Plasticity (ISV + FEA) 100-500µm Bridge 6 = Elastic Moduli Bridge 7 = High Rate Mechanisms Bridge 8 = Dislocation Motion Bridge 9 = Void \ Crack Nucleation Bridge 10 = Void \ Crack Growth Multiscale Metals Modeling
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Multiscale Polymer Composites Macroscale ISV Continuum Bridge 1 = Interfacial Energy, Elasticity Atomistics (EAM,MEAM,MD,MS) Nm Bridge 2 = Mobility Bridge 3 = Hardening Rules Bridge 4 = Particle Interactions Bridge 5 = Particle- Void Interactions Nanoparticle/ crack Interactions Bridge 11 = FEA ISV Bridge 12 = FEA Coarse graining 100’s Nm Electronics Principles (DFT) Å Coarse graining, MD and MC Fracture mechanics (ISV + FEA) Bridge 6 = Elastic Moduli Bridge 7 = High Rate Mechanism s Bridge 8 = Density, T effects Bridge 9 = Bonding, mobility Bridge 10 = Nanoparticle, polymer interactions Micromechanics (ISV and FEA) 100-500µm 10-100 µm
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crack coalescence Electronics Principles (ab- initial, DFT) Macroscale ISV Continuum Bridge 4 = fiber/paste bonding aggregate/paste bonding Multiscale Concrete Modeling Bridge 1 = Interfacial Energy, Elasticity atomic potentials Atomistics (MD, MC) Nm Bridge 2 = interparticle potentials, contact laws Bridge 3 = bonding strength, effects of water Bridge 5 = fiber- bridging, Bridge 12 = FEA Bridge 32 = FEA Coarse graining, DEM 100’s Nm Å Meshless FEA +DEM) Bridge 6 = Elastic Moduli Bridge 7 = High Rate Mechanism s Bridge 8 = creep,shrin kage Bridge 9 = crack nucleation Bridge 10 =crack growth Micromechanics (FEA,DEM) 1-10mm 0.1-1 mm (FEA, DEM)
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ME4123/6123: Failure of Engineering Materials: Lsn 2: Multiscale Aspects IVS Model Void Growth Void/Void Coalescence Void/Particle Coalescence Fem Analysis Idealized Geometry Realistic RVE Geometry Monotonic/Cyclic Loads Crystal Plasticity Experiment Fracture of Silicon Growth of Holes Experiment Uniaxial/torsion Notch Tensile Fatigue Crack Growth Cyclic Plasticity FEM Analysis Torsion/Comp Tension Monotonic/Cyclic Continuum Model Cyclic Plasticity Damage Structural Scale Structural Scale Experiments FEM Model Cohesive Energy Critical Stress Analysis Fracture Interface Debonding Nanoscale Experiment SEM Optical methods ISV Model Void Nucleation FEM Analysis Idealized Geometry Realistic Geometry Microscale Microscale Mesoscale Mesoscale Macroscale ISV Model Void Growth Void/Crack Nucleation Experiment TEM
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What Can Cause Material Failure in a Product? Improper Material Selection ------------ 38% Fabrication Defects ----------------------- 15% Faulty Heat Treatment ------------------- 15% Mechanical Design Error ---------------- 11% Unforeseen Operating Condition ------ 8% Inadequate Environmental Control ---- 6% Crack of Inspection/Quality Control --- 5% Material Mix-up ----------------------------- 2%
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Microstructure-property Relation To predict & avoid material failure we must
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