Theses/Dissertations - Mechanical Engineering
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The effect of defects and imperfections on the structural integrity of adhesively bonded laminated composites.
(2021-03-26)The increased demand for long range, fuel efficient and high performance, high fuel economy automobiles has resulted in the growth of use of composites in aerospace and automotive sectors . Adhesive bonding is the preferred ... -
Photogrammetric measurements of frost roughness evolution on a cold-soaked wing tank model.
(2020-07-15)An aircraft subjected to cold-soaked fuel frost (CSFF) on its wing surface is not allowed to take off without FAA certification because of aerodynamic performance degradation caused by frost accretion. A physical model of ... -
Variation of cold-soaked fuel frost roughness with location on a flat plate.
(2021-11-09)Cold-soaked fuel frost occurs when moist air flows over an aircraft surface that is colder than the dew point temperature following a flight. Previous studies show that cold-soaked fuel frost depends on surface temperature, ... -
Mechanical and thermal property prediction in single beads of large area additive manufactured short-fiber polymer composites.
(2021-12-06)The prediction of mechanical and thermal properties of 3D printed short-fiber reinforced polymers (SFRPs) are investigated in this study. Methods are demonstrated for predicting the internal spatially varying fiber orientation ... -
Evaluation of carbon fiber laminates via the use of pulse-echo ultrasound to quantify ply-stack orientation and manufacturing defects.
(2021-11-10)The use of carbon fiber composites have become more prevalent. Laminated composites provide advantages over traditional materials as the final properties of the part can be tuned. These materials also provide new challenges ... -
High-fidelity simulation of air-assisted atomization with inlet gas turbulence.
(2021-11-03)Atomization is the process for bulk liquids to disintegrate into small droplets, which is commonly seen in nature and and industrial applications. Airblast atomization is an air-assisted atomization approach and is widely ... -
Internal fiber orientation measurements and void distribution for large area additive manufactured parts using optical and SEM imaging techniques.
(2021-08-10)The use of additively manufactured parts for industrial applications has grown is often limited by their structural performance and compromised thermal dimensional stability. The addition of carbon fiber reinforcements, ... -
Moment analysis methods of ultrasonic waveforms to characterize the internal temperature and melt transition boundary for materials with irregular porosity.
(2021-08-05)The utilization of acoustic measurements occurs frequently in a multitude of industries. Monitoring the internal thermal and phase states of materials is of particular interest to the petro-chemical, food, and polymer ... -
Nondestructive evaluation of out-of-plane wrinkles within woven carbon fiber reinforced plastics (CFRP) using ultrasonic detection.
(2021-08-10)In the automotive and aerospace industries composite materials are heavily utilized as they provide a great strength to weight ratio relative to their metallic counterparts. A drawback is they require complex manufacturing ... -
The influence of vapor pressure on droplet contact dynamics on smooth surfaces.
(2021-07-14)Droplet impact experiments were performed with different fluids using Total Internal Reflection Microscopy (TIRM) on a smooth surface to gain insight into the mechanism for the air film failure of volatile liquids. Several ... -
Evaluating a commercially available, immersive virtual reality system for measuring common lower body rehabilitation motions.
(2021-05-04)Lower body rehabilitation has been marked by qualitative assessments and observations. Quantitative measuring devices often present a financial burden that many clinics cannot overcome. Virtual Reality (VR) systems offer ... -
Numerical and theoretical study of natural oscillations of supported drops with free and pinned contact lines.
(2021-04-19)The oscillation of drops supported by solid surfaces is important to a wide variety of applications, such as dropwise condensation. Identification of the natural frequencies of supported drops of different sizes and liquids ... -
Assessing precision and application of marker placement device to enhance motion capture studies.
(2020-11-13)Motion capture has become an important clinical tool used in applications of therapy and treatment plans as well as surgical evaluations. However, due to factors such as human error, having multiple examiners, and using ... -
Aerodynamic and aeroacoustic design of small unmanned aircraft system propellers at low Reynolds numbers.
(2020-11-19)The Small Unmanned Aircraft System (sUAS) has become an overwhelmingly important asset for military intelligence, surveillance, and reconnaissance in addition to a multitude of needs in the commercial industry. More research ... -
Evaluation of structural behavior using constituent material properties and finite element analysis for large format fiber reinforced composites made from recycled polymers.
(2020-12-03)Recycling of polymers is of great interest to society with industry and government focusing on new applications to reduce waste generation. Most polymers have low modulus and strength compared to metals, and based on the ... -
Ideation, validity, and practicality of using virtual reality to conduct the Wolf Motor Function Test for upper limb stroke patients.
(2020-11-13)In this study, 11 subjects between the ages of 19 and 35 years old performed tasks selected from the official Wolf Motor Function Test (WMFT) – Hand to Table, Hand to Box, and Lift Can. Subjects performed the tasks in ... -
Investigating the impact of interacting with real world objects in virtual environments.
(2020-11-19)Virtual reality (VR) systems allow users to be fully immersed in a virtual world. Incorporating physical objects such as stairs in to virtual reality could provide better immersion and create new uses for these systems. ... -
Convection measurements in scale models of additively manufactured turbine blade cooling passages.
(2020-11-12)High pressure gas-turbine blades and components are typically constructed with interior cooling air passages. Additive manufacturing processes, such as direct metal laser sintering (DMLS), enable creation of novel turbine ... -
High-fidelity simulation of liquid atomization in quiescent environment and supersonic flows.
(2020-09-24)The atomization of liquid fuel in both quiescent environment and supersonic flows is essential to a wide variety of applications. Since it is challenging to obtain high-level details of the time-dependent, 3D, and chaotic ... -
Quantifying physiological and neurological responses to organic motion patterns.
(2020-07-29)The human body was designed to move, and the benefits of exercise and an active lifestyle are well known. However, many individuals live with neuromuscular conditions that limit movement and quality of life. One treatment ...