Welcome to SOAR: Shocker Open Access Repository!
SOAR is the institutional repository of Wichita State University. Its primary purpose is to make the University’s digital scholarship available to a global audience and to serve as a reliable digital storage solution. SOAR functions dually as both a publication platform and a digital archive. University faculty and staff are encouraged to publish their research works, data, or documents in SOAR. For student submissions, a recommendation from their professors is required.
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Item TS Express Fall 2024, v.22 iss.4(Wichita State University, 2024-09)Item Ultrasonic welding process development for thermoplastic aircraft fuselage skin panel(Soc. for the Advancement of Material and Process Engineering, 2024-05-23)Reinforced thermoplastic composites are an attractive material solution for many commercial and defense vehicle applications due to their ability to reduce manufacturing cycle time and cost. Additionally, thermoplastic composites have superior toughness and environmental resistance compared to thermoset composites and offer the ability to eliminate or decrease the use of mechanical fasteners at joints by fusion/welding. When welding thermoplastic composite assemblies, each substrate is heated to melt the polymer at the interface of the joint. While heating, the joint is held under pressure until the polymer solidifies and the substrates are consolidated. This forms a unitized structure, with no identifiable interface after the welding is complete. Fusion also offers significant benefits over the bonding process due to the minimal substrate preparation, higher weld properties and its time efficiency. Ultrasonic Welding is one such fusion technology where the interface between two substrates is excited through high frequency vibrations. As part of the technology development, the weld process parameters, interface, and substrates were found to play key roles in the final weld quality. This work discusses the sensitivities and the key factors in thermoplastic weld development along with the manufacturing development for a scaling up process from coupon to sub-element level structural assessment. Strength characterization and weld parameter driven influences on interface quality were also investigated and documented based on findings. © 2024 Soc. for the Advancement of Material and Process Engineering. All rights reserved.Item In-situ consolidation thermoplastic process development for toolless automated fiber placement manufacturing in space(Soc. for the Advancement of Material and Process Engineering, 2024-05-23)To meet NASA and space industries ambitious goals of deep space exploration and planetary habitation for enabling human presence beyond Earth, a paradigm shift in manufacturing and assembly of structures is required. Prefabricated structures built for space applications are significantly over-designed to withstand aggressive lift-off and transient loads during launch. Since the infrastructure required to achieve these objectives are constrained by the launch vehicle size and mission cost, it is imperative to develop the technologies required to manufacture and assemble large space-based platforms and habitats in space or on-site to be independent of Earth-based resources and logistics. To unleash the power of automation, an advanced dual-robotic automated fiber placement system that works in tandem to become a toolless manufacturing process was developed to fabricate advanced thermoplastic composite structures in space. With this highly adaptable automated toolless manufacturing (AToM) technology for thermoplastics, robot movements are coordinated to produce three dimensional composite parts out-of-autoclave. This is analogous to additive manufacturing with the added enhancement of continuous fibers in three-dimensional space for structural applications. This approach has several benefits; it would use a minimal number of resources and tooling, mitigate multiple launch requirements for large structures, revolutionize Earth-based manufacturing of aerospace structures, and it would not restrict the size, weight, or complexity of required structures. Since this is a construction-based technology, it spans across the energy, transportation, and shipping sectors. This technology is forecast to have a vast domain of development partners confirming its economical sustainability. It could be energy efficient, portable, and redeployable in orbit, to an asteroid, or to a planet. Since this technology does not require part-specific tooling and can accommodate large complex geometries, the construction is recyclable, repurposable, generates minimal scrap with high material yield, and enables performing structural repair or rework in space. © 2024 Soc. for the Advancement of Material and Process Engineering. All rights reserved.Item Modernization and Integration of Technologies for Ground Systems (MINT-GS): Qualification of 17-4PH stainless steel manufactured using laser powder bed fusion & direct energy deposition additive manufacturing processes(SAE International, 2024-09-19)There is a critical military need to improve readiness and operational performance by utilizing Additive Manufacturing (AM) for the sustainment and modernization of ground vehicles. AM opens the opportunity to add value to the manufacturing of parts and components that may be limited or not achievable by traditional manufacturing methods and materials. Additionally, AM can serve as a secondary source of manufacturing that can solve supply-chain and obsolescence issues at the point of need or point of repair. One of the primary challenges that exists with AM is the lack of defined standards for the qualification of materials and processes. WSU-NIAR is collaborating with the Army Ground Vehicle System Center to address this challenge by establishing a rapid qualification process utilizing Laser Powder Bed Fusion (LPBF) and Direct Energy Deposition (DED) AM processes with 17-4PH stainless steel material applied to ground vehicle parts of need. An overview of the 2023 MINT-GS projects at WSU-NIAR is discussed throughout this paper. In the early stages of this effort, candidate parts were jointly identified and a suitability assessment was performed for the AM processes considered using 17-4PH stainless steel. An overview of the critical path parts selected for qualification is provided along with the criteria used for the suitability assessment. Additionally, the pre-qualification (screening) and qualification considerations are discussed for each modality. © Rights reserved by the National Defense Industrial Association (NDIA) Michigan Chapter, authors and their respected organizations.Item Synthesis, crystal and electronic structures, and magnetic and electrical transport properties of bismuthides NdZn0.6Bi2 and (La0.5RE0.5)Zn0.6Bi2 (RE = Pr or Nd)(American Chemical Society, 2024-09-19)Bismuth is a good constituent element for many quantum materials due to its large atomic number, 6s26p3 orbitals, and strong spin-orbital coupling. In this work, three new bismuthides, NdZn0.6Bi2, (La0.5Pr0.5)Zn0.6Bi2, and (La0.5Nd0.5)Zn0.6Bi2, were grown by a metal flux method, and their crystal structures were accurately determined by single-crystal X-ray diffraction. These new bismuthides belong to the RE-T-Pn2 (RE = La-Lu, T = Mn, Fe, Co, Ni, or Zn, and Pn = P, As, Sb, or Bi) family, are isostructural, and crystallize in the HfCuSi2 structure type. The bismuth elements have two possible oxidation states, Bi3- and Bi-, which were studied by X-ray photoelectron spectroscopy (XPS). Two binding energy peaks of 155.91 and 161.23 eV were observed for Bi atoms within NdZn0.6Bi2, and similar binding energy peaks were detected in NdBi and LiBi. XPS also confirmed the trivalent nature of Nd, which was further verified by magnetic measurements. Additionally, magnetic measurements revealed that NdZn0.6Bi2 exhibits an antiferromagnetic transition around 3 K, while the mixed-cation compounds do not show any magnetic transition down to 2 K. Electronic transport measurements reveal weak magnetoresistance in all three compounds, with a maximum value of ∼25% at 2 K and 9 T for (La0.5Nd0.5)Zn0.6Bi2 © 2024 American Chemical Society.
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