6 Matching Results

Search Results

Results: 1 - 6
open access

Investigation of Interfacial Property with Imperfection: A Machine Learning Approach

Description: Interfacial mechanical properties of adhesive joints are very crucial in board applications, including composites, multilayer structures, and biomedical devices. Establishing traction-separation (T-S) relations for interfacial adhesion can evaluate mechanical and structural reliability, robustness, and failure criteria. Due to the short range of interfacial adhesion such as micro to nanoscale, accurate measurements of T-S relations remain challenging. The advent of machine learning (ML) became … more
Date: July 2023
Creator: Ferdousi, Sanjida
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

3D Printed Self-Activated Carbon Electrodes for Supercapacitor Applications

Description: This study investigated a new approach to achieving high energy density supercapacitors (SCs) by using high surface area self-activated carbon from waste coffee grounds (WCGs) and modifying 3D printed electrodes' porous structure by varying infill density. The derived activated carbons' surface area, pore size, and pore volume were controlled by thermally treating the WCGs at different temperatures (1000˚C, 1100˚C, and 1200˚C) and post-treating with HCL to remove water-soluble ashes and contami… more
Date: July 2023
Creator: Disi, Onome Aghogho
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Suppression of Higher Acoustic Harmonics by Application of Solid-Solid Periodic Layered Structure in Nonlinear Ultrasonics Nondestructive Evaluation Field

Description: Nondestructive testing (NDT) using ultrasound band 1-5 MHz, has been widely used for the early-stage detection of structural failure; however, it fails to detectf material degradation, fatigue, and microcracks. NDT with nonlinear ultrasound (NLU) can detect a microscopic discontinuity or imperfection that may be a source of the second harmonic in the reflected signal. In this research, we focus on creating a metamaterial band filter that filters out nonlinearities induced by the instrument itse… more
Date: May 2023
Creator: Kang, Jinho
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Rapid, Approximate Multi-Axis Vibration Testing

Description: Sequential single-axis vibration testing strategies often produce over-testing when qualifying system hardware. Multi-axis excitation techniques can simulate realistic service environments, but the hardware and testing strategies needed to do so tend to be costly and complex. Test engineers instead must execute sequential tests on single-axis shaker tables to excite each degree of freedom, which the previous two decades of vibration testing literature have shown to cause extensive over-testing … more
Date: May 2023
Creator: Cramer, Ethan Savoy
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Green Manufacturing of Lignocellulosic Fiber through Bacterial Degradation Process

Description: Lignocellulose is the most abundant biopolymer on earth and offers excellent potential for sustainable manufacturing. Because lignocellulose is structurally complex and resistant to decomposition, innovative degradation strategies are necessary to unlock its value. In this dissertation, a green manufacturing process through enzyme-triggered self-cultured bacteria retting for lignocellulosic fiber was developed and investigated. The mechanism of the lignocellulosic fiber retting at a controlled … more
This item is restricted from view until January 1, 2025.
Date: December 2023
Creator: Fu, Yu
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Experimental and Numerical Investigation of a Novel Cold-Formed Steel Long Span Truss

Description: This thesis describes the experimental and numerical investigation of a novel cold-formed steel 48ft and 54ft long span truss. The truss we designed was to be used as the roofs of large buildings, such as warehouses, hangars, sports arenas. The investigation includes both experimental and numerical testing, the experimental testing of the truss under uniform loads (increasing loads) to determine its deflection and load carrying capacity. The numerical test included developing a finite element m… more
Date: December 2023
Creator: Nalla, Sai Kumar
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
Back to Top of Screen