A5007243219- Solidification and crystal growth phenomena
- Aluminum Alloy Microstructure Properties
- Parallel Computing and Optimization Techniques
- Microstructure and mechanical properties
- Nanoporous metals and alloys
- Numerical methods in engineering
- Advancements in Battery Materials
- Additive Manufacturing and 3D Printing Technologies
- Block Copolymer Self-Assembly
- nanoparticles nucleation surface interactions
- Advanced Battery Materials and Technologies
- Metallurgy and Material Forming
- Anodic Oxide Films and Nanostructures
- Manufacturing Process and Optimization
- IoT-based Smart Home Systems
- Innovation Policy and R&D
- Wireless Sensor Networks and IoT
- Thermal Expansion and Ionic Conductivity
- Advanced Manufacturing and Logistics Optimization
- Distributed and Parallel Computing Systems
- 3D IC and TSV technologies
- Intellectual Property and Patents
- Diamond and Carbon-based Materials Research
- Biomedical and Engineering Education
- Embedded Systems Design Techniques
University of Michigan
2018-2025
University of Freiburg
2020-2022
AT&T (United States)
2002
Abstract A new phase-field modeling framework with an emphasis on performance, flexibility, and ease of use is presented. Foremost among the strategies employed to fulfill these objectives are a matrix-free finite element method modular, application-centric code structure. This approach implemented in open-source PRISMS-PF framework. Its performance enabled by combination variant adaptive mesh refinement, explicit time integration, multilevel parallelism. Benchmark testing particle growth...
Lithium-reservoir-free solid-state batteries can fail due to electrical shorting as a result of fracture and lithium metal filament formation. Mechanical stress at the solid electrolyte surface induce fractures, which promote growth. This arises from both electrochemical sources, electrodeposition, mechanical such external stack pressure. Solid roughness applied pressure together affect development. study combines experiments, 3D synchrotron imaging, mesoscale modeling explore how influences...
Abstract This article highlights applications of phase-field modeling to electrochemical systems, with a focus on battery electrodes. We first provide an overview the physical processes involved in systems and approach understand thermodynamic kinetic mechanisms underlying these processes. employ two examples highlight how realistic thermodynamics kinetics can naturally be incorporated into One is composite cathode intercalation compound (Li x FePO 4 ) as electrochemically active material,...
Grain boundary formation during coarsening of nanoporous gold (NPG) is investigated wherein a nanocrystalline structure can form by particles detaching and reattaching to the structure. MicroLaue electron backscatter diffraction measurements demonstrate that an in-grain orientation spread develops as NPG coarsened. The volume fraction sample near limit bicontinuity, at which simulations predict bicontinuous begins fragment into independent coarsening. Phase-field using computationally...
Abstract Grain boundaries can greatly affect the transport properties of polycrystalline materials, particularly when grain size approaches nanoscale. While often enhance diffusion by providing a fast pathway for chemical transport, some material systems, such as those solid oxide fuel cells and battery cathode particles, exhibit opposite behavior, where act to hinder diffusion. To facilitate study systems with hindered boundary diffusion, we propose model that utilizes smoothed method...
Two-phase mixtures, from metallic alloys to islands on surfaces, undergo coarsening wherein the total interfacial area of system decreases with time. Theory predicts that during average size-scale a two-phase mixture increases time as t1/3 when is self-similar, or independent scaled by time-dependent length. Here, we explain why this temporal power law so robustly observed even microstructure not self-similar. We show there exists an upper limit length scales in are kinetically active...
Coarsening of bicontinuous microstructures is observed in a variety systems, such as nanoporous metals and mixtures that have undergone spinodal decomposition. To better understand the morphological evolution these structures during coarsening, we compare morphologies resulting from two different coarsening mechanisms, surface bulk diffusion. We perform phase-field simulations via each mechanism two-phase mixture at nominal volume fractions 50%-50% 36%-64%, simulated are characterized terms...
We deform representative volume elements of amorphous carbon obtained from melt-quenches in molecular dynamics calculations using bond-order and machine learning interatomic potentials. A Drucker-Prager law with a zero-pressure flow stress $41.2$~GPa an internal friction coefficient $0.39$ describes the deviatoric during as function pressure. identify mean coordination number order parameter describing this surface. However, description dynamical relaxation quenched samples towards...
This work presents a critical overview of the effects different aspects model formulation on crack path selection in quasi-static phase field fracture. We consider evolution methods, mechanics formulations, fracture dissipation energy and forms irreversibility condition. The variants are implemented with common numerical methods based staggered solution phase-field sub-problems via FFT-based solvers. These mix standard approaches novel elements, such as use bound-constrained conjugate...
This paper describes the new AT&T Optimized Reconfigurable Cell Array (ORCA) 2CA and 2TA series of Field-Programmable Gate Arrays (FPGAs). Both are based on ORCA 2C/T architecture, but migrated to advanced 0.35 /spl mu/ CMOS processes. These two processes individually optimized for 5V 3.3V operations. In addition, architectural innovations incorporated into enhance both performance functionality. include: Efficient support parallel multiplier synchronous single-port dual-port memories...