ASU Electronic Theses and Dissertations
This collection includes most of the ASU Theses and Dissertations from 2011 to present. ASU Theses and Dissertations are available in downloadable PDF format; however, a small percentage of items are under embargo. Information about the dissertations/theses includes degree information, committee members, an abstract, supporting data or media.
In addition to the electronic theses found in the ASU Digital Repository, ASU Theses and Dissertations can be found in the ASU Library Catalog.
Dissertations and Theses granted by Arizona State University are archived and made available through a joint effort of the ASU Graduate College and the ASU Libraries. For more information or questions about this collection contact or visit the Digital Repository ETD Library Guide or contact the ASU Graduate College at gradformat@asu.edu.
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- Creators: Mobasher, Barzin
- Creators: Margolis, Eric
Description
Composite materials have gained interest in the aerospace, mechanical and civil engineering industries due to their desirable properties - high specific strength and modulus, and superior resistance to fatigue. Design engineers greatly benefit from a reliable predictive tool that can calculate the deformations, strains, and stresses of composites under uniaxial and multiaxial states of loading including damage and failure predictions. Obtaining this information from (laboratory) experimental testing is costly, time consuming, and sometimes, impractical. On the other hand, numerical modeling of composite materials provides a tool (virtual testing) that can be used as a supplemental and an alternate procedure to obtain data that either cannot be readily obtained via experiments or is not possible with the currently available experimental setup. In this study, a unidirectional composite (Toray T800-F3900) is modeled at the constituent level using repeated unit cells (RUC) so as to obtain homogenized response all the way from the unloaded state up until failure (defined as complete loss of load carrying capacity). The RUC-based model is first calibrated and validated against the principal material direction laboratory tests involving unidirectional loading states. Subsequently, the models are subjected to multi-directional states of loading to generate a point cloud failure data under in-plane and out-of-plane biaxial loading conditions. Failure surfaces thus generated are plotted and compared against analytical failure theories. Results indicate that the developed process and framework can be used to generate a reliable failure prediction procedure that can possibly be used for a variety of composite systems.
ContributorsKatusele, Daniel Mutahwa (Author) / Rajan, Subramaniam (Thesis advisor) / Mobasher, Barzin (Committee member) / Neithalath, Narayanan (Committee member) / Arizona State University (Publisher)
Created2021
Description
Compulsory monogamy, theorized from compulsory heterosexuality, is the normalization of the single dyad by means of violence towards consensual nondyadic relational configurations for the purposes of maintaining monogamy’s power. With compulsory monogamy as the undercurrent, the formation of the polyamorous identity must weave through its grasps and carve pathways towards the full embodiment of polyamory. The purpose of this dissertation is to both recognize where the current conceptualization of compulsory monogamy manifests within people who are newly developing their polyamorous identity or exploring polyamorous experiences, and to understand the process people go through of unbecoming monogamous and becoming polyamorous. This dissertation utilizes both autoethnographic accounts of the researcher’s own polyamorous journey and stories from polyamorous people all around the world. Thirteen polyamorous people participated in semi-structured in-depth interviews where they were asked about their early polyamorous experiences and to tell stories of their process of unlearning elements of monogamy and embracing polyamory while simultaneously grappling with the presence of compulsory monogamy. Several themes were uncovered upon analysis of these stories, including tension with the normative, understanding what polyamory and relationships are, and the process of coming into one’s identity from living and embodying a previously monogamous life. Polyamory is a learn-by-doing, mix-and-match approach to relationships without a blueprint to follow and aspects of relationships are pulled together to form a relationship unique to the people involved. What is gained from a journey through uncertainty, risk, and possibly trauma and violence is a sense of comfort, community, and peace.
ContributorsNiess, Lucy (Author) / Guerrero, Laura K (Thesis advisor) / LeMaster, Loretta (Thesis advisor) / Margolis, Eric (Committee member) / Arizona State University (Publisher)
Created2022
Description
To understand the visual culture and art education practices within three ideologically distinct kindergartens, I employed an interdisciplinary approach, utilizing tools from the fields of art, education, anthropology, literary theory, visual studies and critical social theory. Each of the three schools was considered to be the "best" of its kind for the community in which it resided; TBS was the original bilingual school, and the most Westernized. It was set in the heart of a major city. The second school, OBS, operated from an Islamic framework located in an under-developed small transitioning suburb; and the last school, NBS, was situated in Al-Jahra, an "outlying area" populated by those labeled as bedouins (Longva, 2006). The participants' attitudes towards art education unfolded as I analyzed my visual observations of the participants' daily practices. I have produced a counter-hegemonic visual narrative by negotiating my many subjectivities and methods to gain new knowledge and insights. This approach has provided a holistic understanding of the environment in each site, in which attitudes and practices relating to art education have been acquired by the community. Operating from three different educational paradigms, each school applied a different approach to art education. The more Westernized school viewed art as an individual act which promoted creativity and expression. In the Islamic school art was viewed as an activity that required patterning (Stokrocki, 1986), and that the child needed to be guided and exposed to the appropriate images to follow. In the bedouin school, drawing activities were viewed as an opportunity for representing one's individual story as well as a skill for emergent literacy.
ContributorsAl-Bader, Jawaher Khaled (Author) / Young, Bernard (Thesis advisor) / Margolis, Eric (Committee member) / Tobin, Joseph (Committee member) / Arizona State University (Publisher)
Created2012
Description
Alkali-activated aluminosilicates, commonly known as "geopolymers", are being increasingly studied as a potential replacement for Portland cement. These binders use an alkaline activator, typically alkali silicates, alkali hydroxides or a combination of both along with a silica-and-alumina rich material, such as fly ash or slag, to form a final product with properties comparable to or better than those of ordinary Portland cement. The kinetics of alkali activation is highly dependent on the chemical composition of the binder material and the activator concentration. The influence of binder composition (slag, fly ash or both), different levels of alkalinity, expressed using the ratios of Na2O-to-binders (n) and activator SiO2-to-Na2O ratios (Ms), on the early age behavior in sodium silicate solution (waterglass) activated fly ash-slag blended systems is discussed in this thesis. Optimal binder composition and the n values are selected based on the setting times. Higher activator alkalinity (n value) is required when the amount of slag in the fly ash-slag blended mixtures is reduced. Isothermal calorimetry is performed to evaluate the early age hydration process and to understand the reaction kinetics of the alkali activated systems. The differences in the calorimetric signatures between waterglass activated slag and fly ash-slag blends facilitate an understanding of the impact of the binder composition on the reaction rates. Kinetic modeling is used to quantify the differences in reaction kinetics using the Exponential as well as the Knudsen method. The influence of temperature on the reaction kinetics of activated slag and fly ash-slag blends based on the hydration parameters are discussed. Very high compressive strengths can be obtained both at early ages as well as later ages (more than 70 MPa) with waterglass activated slag mortars. Compressive strength decreases with the increase in the fly ash content. A qualitative evidence of leaching is presented through the electrical conductivity changes in the saturating solution. The impact of leaching and the strength loss is found to be generally higher for the mixtures made using a higher activator Ms and a higher n value. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) is used to obtain information about the reaction products.
ContributorsChithiraputhiran, Sundara Raman (Author) / Neithalath, Narayanan (Thesis advisor) / Rajan, Subramaniyam D (Committee member) / Mobasher, Barzin (Committee member) / Arizona State University (Publisher)
Created2012