A5040209770- Metal and Thin Film Mechanics
- Nuclear Materials and Properties
- Microstructure and mechanical properties
- Diamond and Carbon-based Materials Research
- Fusion materials and technologies
- Orthopaedic implants and arthroplasty
- Advanced materials and composites
- Advanced Surface Polishing Techniques
- Ion-surface interactions and analysis
- High-Velocity Impact and Material Behavior
- Advanced ceramic materials synthesis
- Silicon and Solar Cell Technologies
- Mechanical Behavior of Composites
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Wind Energy Research and Development
- Nanowire Synthesis and Applications
- Force Microscopy Techniques and Applications
- Aerodynamics and Fluid Dynamics Research
- Wind and Air Flow Studies
- Nuclear Physics and Applications
- Thin-Film Transistor Technologies
- Adhesion, Friction, and Surface Interactions
- Rock Mechanics and Modeling
- Advanced MEMS and NEMS Technologies
Aston University
2009-2023
Los Alamos National Laboratory
2004-2013
Max-Planck-Institut für Nachhaltige Materialien
2010
Center for Integrated Nanotechnologies
2007-2010
Naval Research Laboratory Materials Science and Technology Division
2006
Institute of Materials Research of the Slovak Academy of Sciences
2004-2005
Oak Ridge National Laboratory
2000-2002
University of Tennessee at Knoxville
1999-2002
The University of Texas at Austin
1997-1999
University of Notre Dame
1993
Abstract The purpose of this study was to investigate the effects elastic anisotropy on nanoindentation measurements in human tibial cortical bone. Nanoindentation conducted 12 different directions three principal planes for both osteonic and interstitial lamellae. experimental indentation modulus found vary with direction showed obvious (oneway analysis variance test, P < 0.0001). Because a specific is determined by all constants bone, complex theoretical model required analyze results....
Abstract Indentation of ceramic materials with smooth indenters such as parabolae revolution and spheres can be conducted in the elastic regime to relatively high loads. Ceramic single crystals thus provide excellent calibration media for load depth-sensing indentation testing; however, they are generally anisotropic a complete analysis is cumbersome. This study presents simplified procedure determination stiffness contact an half-space by rigid frictionless parabola which, first order,...
Brittle fracture in silicon is simulated with molecular dynamics utilizing a modified embedded atom method potential. The simulations produce propagating crack speeds that are agreement previous experimental results over large range of energy. dynamic toughness found to be equal the energy consumed by creating surfaces and lattice defects theoretical predictions. approximately 1/3 static strain release rate, which limiting speed 2/3 Rayleigh wave speed.
Many biological materials are known to be anisotropic. In particular, microstructural components of may grow in a preferred direction, giving rise anisotropy the microstructure. Nanoindentation has been shown an effective technique for determining mechanical properties microstructures as small few microns. However, effects on measured by nanoindentation have not fully addressed. This study presents method account elastic nanoindentation. is used correlate determined from earlier experiments...
The growth of heteroepitaxially strained semiconductors at the nanoscale enables tailoring material properties for enhanced device performance. For core/shell nanowires (NWs), theoretical predictions coherency limits and implications they carry remain uncertain without proper identification mechanisms by which strains relax. We present here Ge/Si NW system first experimental measurement critical shell thickness strain relaxation in a semiconductor heterostructure mechanisms. Axial tangential...
The structure of wurtzite and zinc blende InAs–GaAs (001) core–shell nanowires grown by molecular beam epitaxy on GaAs substrates has been investigated transmission electron microscopy. Heterowires with InAs core radii exceeding 11 nm, strain relax through the generation misfit dislocations, given a shell thickness greater than 2.5 nm. Strain relaxation is larger in radial directions axial, particularly for thicknesses 5.0 consistent statics calculations that predict large shear stress...
This paper aims to enhance the performance of H-Darrieus Vertical Axis Wind Turbine (VAWT) via introducing upstream deflectors. The impact this addition has been investigated and discussed through different deflector configurations. turbine before after adding wind rotor barriers was compared. A two dimensional, incompressible, transient, turbulent flow model built up in order simulate air around blades. Model verification validation were performed comparing solutions using mesh sizes, time...
An asymmetric increase in the apparent values of interfacial fracture toughness with increasing mode II component loading has been observed by several investigators. In this study, cracks were grown a steady-state manner along glass/epoxy interface sandwich specimens order to determine mechanisms responsible for shielding effect. Finite element analysis using hydrostatic stress and strain rate dependent plasticity model epoxy cohesive zone shows that plastic dissipation accounts seen these...