Multi-scale Peridynamics Theory for Corrosion Fatigue Damage Prediction

TDA and its University partner, Cornell University, first address the stress assisted corrosion crack growth from concurrent multi-scale modeling through atomistic simulations in order to formulate and calibrate mesoscale Peridynamics model. Initially, the multi-scale CADD simulations will utilize reactive force field potentials for the 7075-T6Al in water to simulate stress corrosion cracking and then extend to study the near threshold crack growth behavior in water. Future efforts will utilize appropriate force field potentials for 7075-T6Al under various NaCl concentrations and also refine crack tip simulations using linearly scaled density functional theory inputs. Peridynamic kernel formulations will be investigated for improvement and calibration using the CADD simulations input and also address issues arising from skin effect near the interface and from horizon length to deal with corrosion. Both model predictions will be verified and validated against a variety of laboratory data. Stress-free model predictions will be compared and contrasted with molecular automata methodologies. Utilizing all work efforts, we will also develop appropriate computational strategies in a hybrid framework.