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You searched for subject:(Al Alloy Substrate). Showing records 1 – 3 of 3 total matches.

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Indian Institute of Science

1. Gaddam, Venkateswarlu. Synthesis and Characterization of 1D & 2D Nanostructures : Performance Study for Nanogenerators and Sensors.

Degree: 2015, Indian Institute of Science

Recently, efforts have been made for self-powering the batteries and portable electronic devices by piezoelectric nanogenerators. The piezoelectric nanogenerators can work as a power source for nano-systems and also as an active sensor. The piezoelectric nanogenerator is a device that converts random mechanical energy into electrical energy by utilizing the semiconducting and piezoelectric properties. Also, the mechanical energy is always available in and around us for powering these nano devices. The aim of the present thesis work is to explore 1D and 2D ZnO nanostructures (nanorods and nanosheets) on metal alloy substrates for the development of piezoelectric nanogenerators in energy harvesting and sensors applications. Hydrothermal synthesis method was adopted for the growth of ZnO nanostructures. The nanogenerators were fabricated by using the optimized synthesis parameters and subsequently studied their performance for power generation and as an active speed sensor. These 1D and 2D nanostructures based nanogenerators have opened up a new window for the energy harvesting applications and sensors development. The thesis is divided into following six chapters. Chapter 1: This chapter gives a general introduction about energy harvesting devices such as nanogenerators, available energy sources, mechanical energy harvesting, ZnO material and the details on hydrothermal synthesis process. A brief literature survey on different applications of piezoelectric nanogenerators is also included. Chapter 2: A novel flexible metal alloy (Phynox) and its properties along with its applications are discussed in this chapter. Details on the synthesis of 1D ZnO nanorods on Phynox alloy substrate by hydrothermal method are presented. Further, the optimization of parameters such as growth temperature, seed layer annealing and substrate temperature effects on the synthesis of ZnO nanorods are discussed in detail. As-synthesized ZnO nanorods have been characterized using XRD, FE-SEM, TEM and XPS. Chapter 3: It reports on the fabrication of piezoelectric nanogenerator on Phynox alloy substrate as power generating device by harvesting the mechanical energy. Initially, the performance of the nanogenerator for power generation due to finger tip impacts was studied and subsequently its switching polarity test was also carried out. Output voltage measurements were carried out using the in-house developed experimental setup. Stability test was also carried out to see the robustness of the nanogenerator. Finally, the output voltage response of the nanogenerator was studied for its use as an active speed sensor. Chapter 4: Synthesis of Al doped 2D ZnO nanorsheets on Aluminum alloy (AA-6061) substrate by hydrothermal method is reported in this chapter. The optimized parameters such as growth temperature and growth time effects on the synthesis of ZnO nanosheets are discussed. As-synthesized ZnO nanosheets were characterized using XRD, FE-SEM, TEM and XPS. The Al doping in ZnO is confirmed by EDXS and XPS analysis. Chapter 5: Cost… Advisors/Committee Members: Rajanna, K.

Subjects/Keywords: 1D & 2D Nanostructures; Zinc Oxide Nanostructures (ZNO); Metal Alloy Substrates; Piezollectric Nanogenerators; ZnO Nanosheets; ZnO Nanorods; Phynox Alloy Substrate; Al Alloy Substrate; Instrumentation and Applied Physics

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APA (6th Edition):

Gaddam, V. (2015). Synthesis and Characterization of 1D & 2D Nanostructures : Performance Study for Nanogenerators and Sensors. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3885 ; http://etd.iisc.ernet.in/abstracts/4759/G27282-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Gaddam, Venkateswarlu. “Synthesis and Characterization of 1D & 2D Nanostructures : Performance Study for Nanogenerators and Sensors.” 2015. Thesis, Indian Institute of Science. Accessed October 19, 2019. http://etd.iisc.ernet.in/2005/3885 ; http://etd.iisc.ernet.in/abstracts/4759/G27282-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Gaddam, Venkateswarlu. “Synthesis and Characterization of 1D & 2D Nanostructures : Performance Study for Nanogenerators and Sensors.” 2015. Web. 19 Oct 2019.

Vancouver:

Gaddam V. Synthesis and Characterization of 1D & 2D Nanostructures : Performance Study for Nanogenerators and Sensors. [Internet] [Thesis]. Indian Institute of Science; 2015. [cited 2019 Oct 19]. Available from: http://etd.iisc.ernet.in/2005/3885 ; http://etd.iisc.ernet.in/abstracts/4759/G27282-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gaddam V. Synthesis and Characterization of 1D & 2D Nanostructures : Performance Study for Nanogenerators and Sensors. [Thesis]. Indian Institute of Science; 2015. Available from: http://etd.iisc.ernet.in/2005/3885 ; http://etd.iisc.ernet.in/abstracts/4759/G27282-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Ottawa

2. Nastic, Aleksandra. Repair of Aluminum Alloy Aerospace Components and Cold Gas Dynamic Spray Flow Distribution Study .

Degree: 2015, University of Ottawa

Aluminum alloys have been used for decades in aircraft as they offer a wide range of properties explicitly developed to provide a set of characteristics adapted to structural and non-structural components. However, aircraft components inevitably undergo degradation during service due to their extensive use and exposure to harsh environments. Typical repair methods are either not efficient for large scale repairs due to their low material growth rate, not suitable for field repair or involve the use of high process temperatures. The present research aims at evaluating the cold gas dynamic spray (CGDS) as a potential repair technology to restore Al7075-T6 nose landing gear steering actuator threads found on the Boeing 757 aircraft. Moreover, it studies the suitability of using cold spray to deposit Al2024 material. The influence of process parameters and substrate surface preparation on the material deposition efficiency and resulting microstructural and mechanical repair properties is also evaluated.

Subjects/Keywords: Cold Gas Dynamic Spray; Additive Manufacturing; Threads Repair; Substrate Roughness; Pure Aluminum; Al 2024 Alloy; Al 7075 Alloy; Nozzle Material; Particle In-Flight Properties

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APA (6th Edition):

Nastic, A. (2015). Repair of Aluminum Alloy Aerospace Components and Cold Gas Dynamic Spray Flow Distribution Study . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/32998

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Nastic, Aleksandra. “Repair of Aluminum Alloy Aerospace Components and Cold Gas Dynamic Spray Flow Distribution Study .” 2015. Thesis, University of Ottawa. Accessed October 19, 2019. http://hdl.handle.net/10393/32998.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Nastic, Aleksandra. “Repair of Aluminum Alloy Aerospace Components and Cold Gas Dynamic Spray Flow Distribution Study .” 2015. Web. 19 Oct 2019.

Vancouver:

Nastic A. Repair of Aluminum Alloy Aerospace Components and Cold Gas Dynamic Spray Flow Distribution Study . [Internet] [Thesis]. University of Ottawa; 2015. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10393/32998.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nastic A. Repair of Aluminum Alloy Aerospace Components and Cold Gas Dynamic Spray Flow Distribution Study . [Thesis]. University of Ottawa; 2015. Available from: http://hdl.handle.net/10393/32998

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of South Florida

3. Tran, Hai Thanh. Experimental and Computational Study on Fracture Mechanics of Multilayered Structures.

Degree: 2016, University of South Florida

Many devices in electronics are in the form of multilayered structures. These structures can fail catastrophically if they contain defects or cracks. Enhancing their fracture properties is therefore critical to improve the reliability of the systems. The interface-dominated fracture mechanics of multilayered structure was studied using experiments and finite element (FE) modeling by considering two examples: thin films on polymer substrates in flexible electronics and Cu leadframe/epoxy molding compound (EMC) in micro-electronics packaging. In the first example, aluminum-manganese (Al-Mn) thin films with Mn concentration up to 20.5 at.% were deposited on polyimide (PI) substrates. A variety of phases, including supersaturated fcc (5.2 at.% Mn), duplex fcc and amorphous (11.5 at.% Mn), and completely amorphous phase (20.5 at.% Mn) were obtained by adjusting alloying concentration in the film. In comparison with crystalline and dual phase counterparts, the amorphous thin film exhibits the highest fracture stress and fracture toughness, but limited elongation. Based on a fracture mechanism model, a multilayer scheme was adopted to optimize the ductility and the fracture properties of the amorphous film/PI system. Tensile deformation and subsequent fracture of strained Al-Mn films on PI were investigated experimentally and by FE simulations. It was found that by sandwiching the amorphous film (20.5 at.% Mn) between two ductile copper (Cu) layers, the elongation can be improved by more than ten times, and the interfacial fracture toughness by twenty four times with a limited sacrifice of the film's fracture toughness (less than 18%). This design provides important guidelines to obtain optimized mechanical properties of future flexible electronics devices. The reliability of amorphous brittle Al-Mn (20.5 at.% Mn) thin films deposited on PI substrates is strongly influenced by the film/substrate interface adhesion. Some strategies to improve the adhesion of the interface were conducted, including roughening the surface of the PI substrate, adding a buffer layer and then tuning its thickness. Tensile testing and FE analysis of amorphous Al-Mn thin films with and without buffer layers coated on intact and plasma etched rough PI were investigated. It was found that by adding a chromium buffer layer of 75 nm on a rough PI substrate, the interface adhesion of the film/substrate can increase by almost twenty times. The obtained results would thus shed light on the interfacial engineering strategies for improving interface adhesion for flexible electronics. In the second example, a systematic investigation and characterization of the interfacial fracture toughness of the bimaterial Cu leadframe/EMC was carried out. Experiments and FE simulations were used to investigate delamination and interfacial fracture toughness of the biomaterial system. Two dimensional simulations using computational fracture mechanics tools, such as virtual crack closure technique, virtual crack extension and J-integral proved to be computationally cheap…

Subjects/Keywords: Al-Mn alloy; thin film; polymer substrate; multilayer; fracture toughness; finite element simulation; Materials Science and Engineering; Mechanical Engineering; Other Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tran, H. T. (2016). Experimental and Computational Study on Fracture Mechanics of Multilayered Structures. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/6595

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Tran, Hai Thanh. “Experimental and Computational Study on Fracture Mechanics of Multilayered Structures.” 2016. Thesis, University of South Florida. Accessed October 19, 2019. https://scholarcommons.usf.edu/etd/6595.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Tran, Hai Thanh. “Experimental and Computational Study on Fracture Mechanics of Multilayered Structures.” 2016. Web. 19 Oct 2019.

Vancouver:

Tran HT. Experimental and Computational Study on Fracture Mechanics of Multilayered Structures. [Internet] [Thesis]. University of South Florida; 2016. [cited 2019 Oct 19]. Available from: https://scholarcommons.usf.edu/etd/6595.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tran HT. Experimental and Computational Study on Fracture Mechanics of Multilayered Structures. [Thesis]. University of South Florida; 2016. Available from: https://scholarcommons.usf.edu/etd/6595

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.