A5102817148- Surface Treatment and Residual Stress
- Carbon Nanotubes in Composites
- Erosion and Abrasive Machining
- High-Velocity Impact and Material Behavior
- Bone Tissue Engineering Materials
- Energetic Materials and Combustion
- Metal Forming Simulation Techniques
- Metal and Thin Film Mechanics
- Collagen: Extraction and Characterization
- Metallurgy and Material Forming
- Mechanical and Optical Resonators
- Nanomaterials and Printing Technologies
- Additive Manufacturing and 3D Printing Technologies
- Cellular Mechanics and Interactions
- Nanofabrication and Lithography Techniques
- Force Microscopy Techniques and Applications
- Microstructure and mechanical properties
- Rabies epidemiology and control
- Tribology and Wear Analysis
- Corrosion Behavior and Inhibition
- Electrodeposition and Electroless Coatings
- Graphene and Nanomaterials Applications
- Metal Alloys Wear and Properties
- Elasticity and Material Modeling
- Numerical methods in engineering
The University of Texas at Dallas
2013-2017
University of Cincinnati
2011-2012
Dynamic Systems (United States)
2011-2012
University of Cincinnati Medical Center
2011
Oklahoma State University Oklahoma City
2009
Existing and emerging methods in computational mechanics are rarely validated against problems with an unknown outcome. For this reason, Sandia National Laboratories, partnership US Science Foundation Naval Surface Warfare Center Carderock Division, launched a challenge mid-summer, 2012. Researchers engineers were invited to predict crack initiation propagation simple but novel geometry fabricated from common off-the-shelf commercial engineering alloy. The goal of international Fracture...
It has been known for decades that bone exhibits piezoelectric behavior. In recent years, it was directly proved this effect stems from a polymeric matrix in bone, i.e., collagen fibrils. This is distinctly different organic crystals, given the semicrystalline molecular structure of biopolymer. As such, mechanism electromechanical coupling realistic "super-twisted" model elusive. Herein, we present an investigation on using full atomistic simulation based experimentally verified...
Capability to print metals at micro/nanoscale in arbitrary 3D patterns local points of interest will have applications nano-electronics and sensors. Meniscus-confined electrodeposition (MCED) is a manufacturing process that enables depositing from an electrolyte containing nozzle (pipette) patterns. In this process, meniscus (liquid bridge or capillary) between the pipette tip substrate governs localized process. Fabrication metallic microstructures using multi-physics which...
Meniscus-confined electrodeposition (MCED) is a solution-based, room temperature process for 3D printing of metals at micro/nanoscale. In this process, meniscus (liquid bridge or capillary) between nozzle and substrate governs the localized which involves multiple physics electrodeposition, fluid dynamics, mass, heat transfer. We have developed multiphysics finite element (FE) model to investigate effects speed (vN) diameter (D0) in MCED process. The simulation results are validated with...
Laser shock peening (LSP) is an advanced surface enhancement technique used to enhance the fatigue strength of metal parts by imparting deep compressive residual stresses. In present study, LSP was performed on IN718 SPF alloy, a fine grained nickel-based superalloy, with three different power densities and depth resolved strain stress characterization conducted using high energy synchrotron x-ray diffraction in beam line 1-ID-C at Advanced Photon Source Argonne National laboratory. A probe...
Hybrid materials of inorganic–organic phases in which each phase provides different functionality are attractive candidates for achieving multifunctionality. Using a layer‐by‐layer approach, we fabricated sheets piezoelectric polymer P(VDF‐TrFE) reinforced by aligned sub‐micron thick sapphire platelets. The films were transparent and piezoelectric, exhibited ductility up to ≈330%, tensile toughness 26 J g –1 . We investigated the effect thermal annealing on crystallinity its mechanical...
The variation of deflection and maximum stress a nickel film microbridge with load was investigated over wide range length, thickness, elastic modulus residual by both large small theories testings. limits for to be deformed elastically were determined the assumption that could not more than yield strength. Furthermore, theory decided setting threshold beforehand normalized difference between theories. Based on results above, dimensions samples chosen suitable calculated. electroplated...
Understanding the role of ductile polymer phase in mechanical behavior bioinspired hybrid composites is an important step toward development materials with damage tolerant properties. Herein, authors report on fabrication and characterization a lamellar composite by incorporation semicrystalline into freeze casted scaffold. The elastic modulus ductility can be changed more than three 55 times, respectively, addition to 42 folds decrease toughness, thermal annealing post‐processing, after...
It is well-known that nucleation and growth of the mineral phase in bone are intimately linked to interaction between apatite collagen matrix at molecular scale. The exact mechanism this interaction, however, not clear due challenges involved experimental characterization small size-scale. Herein, we employed dynamics (MD) simulations investigate early state (i.e. clustering) clusters on a super-twisted microfibril under mechanical tension an aqueous solution. results reveal (force)...
Summary A discrete hyperelastic model was developed in this paper for a single atomic layer of graphene structure that originally planar. This can be viewed as an extension to the well‐known continuum model. Based on nature structure, notion mapping and concept spatial secant were introduced. The served deformation measure provided geometric exact sense between atomistic representations. By incorporating physics‐based interatomic potential, corresponding then established. After introduction...
Folding in graphene sheet has been extensively observed experimentally. While it is generally recognized that such a conformational state can influence the electronic, magnetic and mechanical properties of nanostructures, mechanism driving nonlinear deformation remains an interesting subject study. Here we present investigation on folding bi-layer due to in-plane compression. To describe lattice registry effect interlay cohesion layered graphitic structures, registry-dependent potential...
We present a semi-analytical approach to study the energy dissipation in carbon nanotube (CNT) beam oscillators under gigahertz excitation. The properties are quantified by quality factor (Q factor) and associated anelastic properties. Our reveals that Q is related tube radius through an inverse relation for both single walled CNTs (SWCNTs) multiwalled (MWCNTs) oscillators. At frequency close resonance range, significant observed due activation of phonon modes serve as major mechanism...
Based on the molecular dynamics simulation and an elastic shell model, we investigated intrinsic loss under dynamic excitations in single walled carbon nanotube (SWCNT) due to anelastic relaxation mechanism. We quantified property of SWCNTs, i.e., creep compliances, showed them be order 1 (TPa-1) sensitive both radius SWCNT loading rate. Furthermore, our study that time scale for a fully achieve its equilibrium through is nanosecond. This leads significant damping resonators operating at...
In this study, the effects of Ultrasonic Nano-crystal Surface Modification (UNSM) on microstructure changes and mechanical properties austenitic stainless steel 304 were studied. Due to dynamic impacts induced by multiple strikes during UNSM, surface nanocrystallization transformation martensite has been achieved. The work-hardened layers (3.5 times original hardness) lead significant improvement in as measured nano-indentation tensile test. results demonstrate that UNSM is a powerful...