A5007153363- Underwater Acoustics Research
- Advanced Materials and Mechanics
- Adhesion, Friction, and Surface Interactions
- Silk-based biomaterials and applications
- Robotic Mechanisms and Dynamics
- Calcium Carbonate Crystallization and Inhibition
- Non-Destructive Testing Techniques
- Ultrasonics and Acoustic Wave Propagation
- Seismic Waves and Analysis
- Metal Forming Simulation Techniques
- Geophysical Methods and Applications
- Underwater Vehicles and Communication Systems
- Oceanographic and Atmospheric Processes
- Marine animal studies overview
- Cellular Mechanics and Interactions
- Advanced Sensor and Energy Harvesting Materials
- Corrosion Behavior and Inhibition
- Aluminum Alloy Microstructure Properties
- Acoustic Wave Phenomena Research
- Force Microscopy Techniques and Applications
- Mechanics and Biomechanics Studies
- Seismic Imaging and Inversion Techniques
- Mechanical Engineering and Vibrations Research
- Bacterial biofilms and quorum sensing
- Elasticity and Wave Propagation
University of Central Florida
2019-2023
Union College
2022-2023
Stress Engineering Services (United States)
2023
University of Dayton
2015-2017
Stennis Space Center
1988-2005
United States Naval Research Laboratory
2002
NATO Centre for Maritime Research and Experimentation
1986
Abstract Stiff scales adorn the exterior surfaces of fishes, snakes, and many reptiles. They provide protection from external piercing attacks control over global deformation behavior to aid locomotion, slithering, swimming across a wide range environmental condition. In this report, we investigate dynamic biomimetic scale substrates for further understanding origins nonlinearity that involve various aspect interaction, sliding kinematics, interfacial friction, their combination....
The influence of diet on the development osteoporosis is significant and not fully understood. This study investigated effect diets varying lipid profiles ω-3, ω-6 ω-9 composition structural mechanical properties bone. hypothesis studied was that a high in saturated fat would induce produce an overall increased detrimental bony response when compared with unsaturated ω-6, or ω-9. Male C57BL/6J mice were fed either control diet, 50:50 mix (saturated:unsaturated) (HFD50:50), (HSF)...
In this letter, we investigate the geometrically tailorable elasticity in twisting behavior of biomimetic scale-covered slender soft substrate. Motivated by our qualitative experiments showing a significant torsional rigidity increase, develop an analytical model and carry out extensive finite element (FE) simulations to validate model. We discover regime differentiated reversible mechanical response straddling linear, nonlinear, rigid behavior. The is highly through geometric arrangement...
Abstract Stress corrosion is a critical issue that leads to high costs in lost equipment and maintenance, affecting the operation safety of aircraft platforms. Most aerospace structural components use aluminum alloys 7xxx series, which contain Al, Cu, Zn, Mg, due combined advantage its high-strength lightweight. However, such alloys, specifically AA7075-T4 AA7075-T651, are susceptible stress cracking when exposed both mechanical stresses corrosive environments. gives rise major technological...
Few studies have investigated the effect of a monosaturated diet high in ω-9 on osteoporosis. We hypothesized that omega-9 (ω-9) protects ovariectomized (OVX) mice from decline bone microarchitecture, tissue loss, and mechanical strength, thereby serving as modifiable dietary intervention against osteoporotic deterioration. Female C57BL/6J were assigned to sham-ovariectomy, ovariectomy, or ovariectomy + estradiol treatment prior switching their feed for 12 weeks. Tibiae evaluated using DMA,...
Biomimetic scale-covered substrates provide geometric tailorability via scale orientation, spacing and also interfacial properties of contact in various deformation modes. No work has investigated the effect friction twisting biomimetic beams. In this work, we investigate frictional effects structure by developing an analytical model verified finite element simulations. model, consider dry (Coulomb) between rigid scales surfaces, substrate as linear elastic rectangular beam. The obtained...
Abstract Scales are a path breaking evolutionary adaptation that accompanied vertebrate evolution for the past 500 million years. Inherently lightweight with diverse shapes, sizes, materials, and distribution, they provide remarkable architecture-material enhancement, typical of metamaterials. Here we perspective on mechanical behavior fish scale inspired structures explain origins some their striking properties include directional nonlinearity, interlocking behavior, multiple penetration...
Biomimetic scale-covered substrates are architected meta-structures exhibiting fascinating emergent nonlinearities via the geometry of collective scales contacts. Despite much progress in understanding their elastic nonlinearity, dissipative behavior arising from sliding is relatively uninvestigated dynamic regime. Recently discovered phenomena viscous emergence, where dry Coulomb friction between can lead to apparent damping overall multi-material substrate. In contrast this structural...
This paper presents a methodology for synthesizing planar linkages to approximate any prescribed periodic function. The mechanisms selected this task are the slider-crank and geared five-bar with connecting rod sliding output (GFBS), where number of double-crank (or drag-link) four-bars used as drivers. A mechanism, when comparing input crank rotation slider displacement, produces sinusoid-like Instead directly driving crank, drag-link four-bar may be added drive from its via rigid...
Fouling of surfaces in prolonged contact with liquid often leads to detrimental alteration material properties and performance. A wide range factors which include mass transport, surface interactions dictate whether foulants are able adhere a surface. Passive means foulant rejection, such as the microscopic patterns, have been known develop nature. In this work, we investigate anti-fouling behaviour animal fur its apparent passive resistance fouling. We compare fouling performance several...
Acoustic propagation in shallow water is examined. Multipath and extensive boundary interactions, which along with a host of other phenomena produce highly variable often unpredictable acoustic field, are discussed. The responsible mechanisms, hence the effects, cover wide range temporal spatial scales classified as either deterministic or random, although two types act concert. Because interactions sound bottom can severely degrade waterborne propagation, sea (and subbottom) provide seismic...
BackgroundEarlier clinical reports have identified femoral anteversion as a factor associated with developmental dysplasia of the hip. This study investigates biomechanical influence on severe dislocations and its effect hip reduction using Pavlik harness.MethodsA computational model an infant lower-extremity, representing ten-week old female was used to analyze biomechanics angles ranging from 30° 70° when dislocation being treated harness. Specifically, effects relationships between muscle...
Extra-terrestrial and extra-vehicular activity (EVA) require extreme remote maneuverability dexterity. At the same time, such robots must be lightweight with possibility of on-site fabrication, retrofitting assembly. This poses a difficult problem for traditional robotic systems materials, which are typically bulky, cannot exhibit large deformations tight spaces limited in their degrees freedom. More significantly, incapable being programmed to change shape, function properties once...
Exoskeletons, such as scales on fishes and snakes were a critical evolutionary adaptation. Honed by millions of years pressures, they are inherently lightweight yet multifunctional, aiding in protection, locomotion optical camouflaging. This makes them an attractive candidate for biomimicry to produce high performance multifunctional materials with applications soft robotics, wearables, energy efficient smart skins on-demand tunable materials. Canonically speaking, biomimetic samples can be...
This paper presents a methodology for synthesizing planar linkages to approximate any prescribed periodic function. The mechanisms selected this task are the slider-crank and geared five-bar with connecting rod sliding output (GFBS), where number of drag-link (or double crank) four-bars used as drivers. A mechanism, when comparing input crank rotation slider displacement, produces sinusoid-like Instead directly driving crank, four-bar may be added that drives from its via rigid connection...
Zhou and colleagues, J. Acoust. Soc. Am., vol.44, p.2042-54 (1991), showed that nonlinear shallow water internal waves (IWs) have the frequency dependent property of enhancing bottom interaction sound. At preferred frequencies, can induce coupling lower-order waterborne modes to higher order modes, which, in turn, penetrate more deeply into lossy ocean sediments. In a follow up study Broadhead, Submitted (1995), analyzed simplified example waveguide which were incorporated through use KdV...
Results of recent Scholte wave measurements at two diverse test sites showed considerable differences in the dispersive behavior these waves. For southern California site, wavers show strong, normal dispersion with group velocities ranging from approximately 30-75 m/s. On other hand, Oregon Margin site was less clearly defined, 30-205 Using a full-wave numerical model (SAFARI/OASES) and seismic mode method, forward modelling (iterative inversion) successful matching curves obtained measured...
The effects of refracting sediments on low-frequency sound propagation in range-dependent oceans are studied with parabolic equation models. predictions three sediment sound-speed models for compared. Two factors that result gradients considered. Variation static pressure due to the variation weight overlying material causes speed increase depth. thermodynamic influence ocean results large a boundary layer uppermost sediment. associated affects attenuation also Both time-domain and...
The characteristics of Scholte seismic interface waves are strongly dependent upon seabed geoacoustics, particularly shear wave properties.Consequently, they may be used as an indirect means to probe the seabed.Here, observations measured at two diverse test sites presented.The responses bottom shots, recorded on a tri-axial set geolphones and nearbottom hydrophone, compared for off southern California Oregon Margin.For data, display strong, normal dispersion, whereas corresponding data site...