Multiscale Modeling of Crystal Plasticity in Al 7075-T651 David Littlewood and Antoinette Maniatty Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute Troy, New York USA Multiscale Modeling of Crystal Plasticity in Al 7075-T651 – p.1/17
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Multiscale Modeling of Crystal Plasticity in Al 7075-T651
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Multiscale Modeling of CrystalPlasticity in Al 7075-T651
David Littlewood and Antoinette Maniatty
Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute
Troy, New York USA
Multiscale Modeling of Crystal Plasticity in Al 7075-T651 – p.1/17
OutlineMotivation
Methodology
Constitutive model
Finite element formulation
Implementation
Results
Calibration results
Model behavior
Multiscale Modeling of Crystal Plasticity in Al 7075-T651 – p.2/17
MotivationPredict failure of Al 7075-T651 under spectrum loading
Fatigue crack initiation at large particles (e.g. Al7Cu2Fe)
Determine which large particles will produce cracks
Focus on crystallography
Key phenomena that must be captured:
Material hardening
Geometric effects (grain structure)
Texture effects (orientation)
Damage accumulation (irreversible slip)
Particle effects
Multiscale Modeling of Crystal Plasticity in Al 7075-T651 – p.3/17
MethodologyModel developed within a collaborative environment:
Underlying
Phenomena
(Nature)
Crystal
Constitutive Model
(RPI)
Polycrystal
FEM Model
(CMU, CU, RPI)
Experimental
Observation
(Small Scale − CMU, Alcoa)
(Large Scale − MSU, NG)
Multiscale modeling approach:
Macro-scale (continuum) FEM models provide boundaryconditions for grain-scale RVE modeling
Multiscale Modeling of Crystal Plasticity in Al 7075-T651 – p.4/17