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Project
Computational Modeling of Fatigue, Fracture, and Ductile Failure Mechanisms at Atomic and Microstructural Scales in Metals



Description:

Microstructure-based multiscale modeling of mechanical failure mechanisms by fatigue crack growth, fracture, and damage mechanics using computational methods.

Uniaxial Stress-Strain Response for Void Growth and Void Coalescence Using Embedded Atom Method


Scientific Merit and Broader Impacts
Scientific Merit
• Multiscale modeling of mechanical failures at nano- and micro-scale will lead to the discovery of principles and mechanisms that govern separation of materials at very small length scales

Broader Impacts
•Improved material resistance to crack initiation propagation and to void nucleation, growth and coalescence
• New modeling tools with accurate predictive capabilities for load carrying components
• Nano- Electromechanical Systems (NEMS) and
• Micro- Electromechanical Systems (MEMS) applications

Crack-Tip Plasticity at Crystallographic Scale


Double Slip Computational Model


Predicted Results and Comparison with Experiments


Crack-Tip Plasticity in Textured Aluminum Alloys


Status
• Planar double slip model implemented and used in fatigue crack growth finite element studies
• Crack tip plastic anisotropy studies in aluminum alloys
• Embedded atom method simulations of damage mechanics at the nanoscale

Future Work
• Fracture and fatigue crack growth simulations at the atomic level
• Fatigue simulations using 3D crystal plasticity
• Modeling of polycrystalline plasticity and damage mechanics