A5038563146- Fatigue and fracture mechanics
- High Temperature Alloys and Creep
- Microstructure and mechanical properties
- Hydrogen embrittlement and corrosion behaviors in metals
- High-Velocity Impact and Material Behavior
- Mechanical stress and fatigue analysis
- Metal Forming Simulation Techniques
- Microstructure and Mechanical Properties of Steels
- Mechanical Failure Analysis and Simulation
- Engineering Structural Analysis Methods
- Structural Load-Bearing Analysis
- Metallurgy and Material Forming
- Additive Manufacturing Materials and Processes
- Neural Networks and Applications
- Structural Integrity and Reliability Analysis
- High-Temperature Coating Behaviors
- Aluminum Alloy Microstructure Properties
- Probabilistic and Robust Engineering Design
- Non-Destructive Testing Techniques
- Manufacturing Process and Optimization
- Force Microscopy Techniques and Applications
- Nuclear Materials and Properties
- Metal and Thin Film Mechanics
- Metallurgical Processes and Thermodynamics
- Powder Metallurgy Techniques and Materials
Cranfield University
2017-2024
Sandia National Laboratories
2016-2017
Sandia National Laboratories California
2016
Georgia Institute of Technology
2011-2015
Woodruff Health Sciences Center
2015
Tenaris (Argentina)
2008-2011
Balseiro Institute
2007
Comisión Nacional de Energía Atómica
2007
Bariloche Atomic Centre
2007
In the high cycle fatigue regime, microstructure attributes such as grain size, shape, and crystallographic orientation usually affect crack formation early growth. However, most computational strategies theoretical models for assessing influence of on stages growth rely simple constitutive 2D microstructures, which limit their applicability in design engineering materials. This work employs finite element simulations that explicitly render 3D an Face-centered cubic (FCC) alloy to evaluate...
Multiscale modelling approaches have demonstrated ample value in understanding, predicting, and engineering materials response. While increasing computational power has aided atomic behaviour from first principles, mesoscale mechanisms such as intergranular failure or crack initiation still rely strongly on correlative models. Crystal Plasticity models been extensively used to relate process-property-structure metallic including effects texture, microplasticity, variability. However, suffer...
Even though crystal plasticity models have been available for decades, the quantification of material parameters is still a matter debate. Polycrystalline experimental results can normally be reproduced by multiple sets parameters, raising concerns about best parameterization to predict grain-level response. This work presents novel physics-based model based on mesoscale dislocation substructures, which are used characterize independently. We employ unique set with known uncertainty...
This Letter presents a quantitative in situ scanning electron microscope (SEM) nanoscale high and very cycle fatigue (HCF/VHCF) investigation of Ni microbeams under bending, using MEMS microresonator as an integrated testing machine. The novel technique highlights ultraslow crack growth (average values down to ∼10–14 m/cycle) that has heretofore not been reported indicates discontinuous process; it also reveals strong environmental effects on lives are 3 orders magnitude longer vacuum than...
Dislocation substructures have been extensively characterized to explain the origin of strain hardening. Regions high dislocation densities (walls) constrain glide mobile dislocations in regions lower density (channels). Transmission electron microscopy (TEM) has shown that distance between walls is inversely proportional flow stress, which often referred as similitude principle. However, it still remains unclear whether a scaling law exists for wall thickness or fraction. The understanding...
Cyclic deformation of metallic materials depends on the interaction multiple mechanisms across different length scales. Solid solution atoms, vacancies, grain boundaries, and forest dislocations interfere with dislocation glide increase macroscopic strength. In single phase under cyclic loading, localization densities in sessile substructures explains a significant fraction strain hardening. Upon cycling, these structures evolve stable configurations, which depend accumulation. This work...
The fracture toughness of thermal barrier coatings (TBC) is a critical mechanical property that governs damage resistance. Catastrophic delamination TBC under erosion conditions occurs in with low toughness. Prior research has explored indirect and complex experiments to measure toughness, but the miniaturized nature multi-layered coating makes it difficult quantify its intrinsic This paper integrates computational modeling experimental approaches estimate substrate strength. results show...