A Coupled Phase Field-Crystal Plasticity FEM Framework with Uncertainty Quantification for Fatigue C
Abstract
For Public Release A Coupled Phase Field-Crystal Plasticity FEM Framework with Uncertainty Quantification for Fatigue Crack Propaga,tion in Aluminum Alloys Fatigue is a commonly observed failure mode in aluminum alloys like the 5000 and 7000,re widely used in the Navy and marine applications. Predicting microstructure-dependent fatigue crack nucleation and growth, connect,ing successive damage states, is a challenging enterprise. The widely used phenomenological approaches can have significant scatter, and large errors due to the absence of underlying physics and material microstructure information, which are important determinants, of fatigue failure. It is necessary to develop robust multi-scale prognosis tools with a comprehensive representation of the depend,ence of crack nucleation and growth on the microstructure and deformation mechanisms. The goal of the proposed research is to develo,p a novel system of uncertainty-quantified spatio-temporal multiscale models for crack nucleation and propagation in polycrystalline, metallic microstructures of Al alloys. A new class of physics-based constitutive models, and computational algorithms of fatigue fa,ilure in crystalline materials will emerge from this research. This research will focus on 5000 and 7000 series Al alloys for model, calibration and validation. This research will incorporate four major tasks.(i) Physics-based coupled phase-field crystal plasticit,ify deformation and crack growth variables in the atomistic domain, and transfer as internal variables in the continuum domain. Self,-consistent consistent homogenization will be conducted with the concurrent multiscale model to develop models of coupled PF-CP cons,ystal plasticity FE models (PF-CPFEM) for crack evolution in polycrystalline microstructures: This task will develop higher order FE, formulations to account for anisotropy in the fracture energy for crystalline solids. It will also advance the wavelet-enriched ada,ptive hierarchical FE model for coupled phase field - crystal plasticity modeling of crack propagation in polycrystalline microstruc,tures. It will address important computational issues including stabilization, solver efficiency, and adaptivity for stable and effi,cient fracture solutions.(iii) Accelerating fatigue simulations with the WATMUS method for PF-CPFEM: To simulate a large number of c,ycles resulting in fatigue failure, the multi-resolution wavelet transformation induced multi-time scaling (WATMUS) method will be a,dvanced in this task for accelerating the PF-CPFEM simulations.(iv) Uncertainty quantification and uncertainty propagation in wavele,t-adapted PF-CPFEM: To address uncertainties in the wavelet-adapted PF-CPFEM, an uncertainty quantified PF-CPFEM framework will be d,eveloped with three sources of uncertainty, viz. (i) model reduction error, (ii) data sparsity error, and (iii) microstructural unce,rtainty. Uncertainty propagation will account for its effect on evolving response functions with deformation. Model calibration and, validation will be done in collaboration with available data in the literature, as well as with potential collaborators at Navy lab,oratories like NRL and NAVAIR, and JHU/Applied Physics Laboratory. The computational platform will advance structure-material reliab,ility and health monitoring that are important in high-performance Navy applications. Technology transfer is planned in the form of, executable computer codes to collaborative partners e.g. at NRL and NAVAIR with appropriate training and guidance . Workshops and s,hort-courses will be organized with broad participation of DoD agencies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 07, 2022
- Source ID
- N000142212781
Entities
People
- Somnath Ghosh
Organizations
- Johns Hopkins University
- Office of Naval Research
- United States Navy