Open Access Theses and Dissertations

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You searched for +publisher:"Vanderbilt University" +contributor:("Dr. Alvin Strauss"). Showing records 1 – 2 of 2 total matches.

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Vanderbilt University

1. Prater, Tracie Joy. An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings.

Degree: MS, Mechanical Engineering, 2008, Vanderbilt University

URL: http://hdl.handle.net/1803/13732 

Friction Stir Welding (FSW) is a solid-state joining process developed by The Welding Institute (TWI) in 1991. The large axial forces associated with this process are typically cited as one of the major obstacles to its widespread application. The primary objective of this research is to quantify the reduction of axial force through use of diamond coatings of FSW tools. Results of welds for coated and uncoated tools on Al 6061 are compared. The goal is to produce friction stir welds using the diamond-coated tool that are comparable in quality to those performed using conventional tool materials, but with an appreciable reduction in tool wear and/or axial force. A finite element solver is used to model the stresses and deformations for the coated and uncoated tools. Aluminum Metal Matrix Composites (Al-MMCs) are used in many naval and aerospace structures. An MMC material is comprised of two parts: a continuous metal matrix (in this case Aluminum) and reinforcing particles dispersed throughout the matrix. The secondary objective of this research is to parameterize the friction stir welding of Aluminum 6061 Metal Matrix Composites reinforced with 17.5 percent Silicon Carbide particles, a superabrasive material valued for its high strength to weight ratio. A range of acceptable process parameters for the joining of this material is established. Since tool wear is a limiting factor in the joining of MMCs, tool wear is periodically monitored and quantified using an optical comparator. Advisors/Committee Members: Dr. George E. Cook (committee member), Dr. Alvin Strauss (Committee Chair).

Subjects/Keywords: Diamond thin films  – Industrial applications; Metallic composites  – Fatigue  – Testing; diamond coatings; Friction stir welding; Metal Matrix Composites; Aluminum  – Fatigue  – Testing

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

APA (6th Edition):

Prater, T. J. (2008). An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13732

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):

Prater, Tracie Joy. “An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings.” 2008. Thesis, Vanderbilt University. Accessed January 21, 2021. http://hdl.handle.net/1803/13732.

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

MLA Handbook (7th Edition):

Prater, Tracie Joy. “An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings.” 2008. Web. 21 Jan 2021.

Vancouver:

Prater TJ. An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings. [Internet] [Thesis]. Vanderbilt University; 2008. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/1803/13732.

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

Council of Science Editors:

Prater TJ. An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings. [Thesis]. Vanderbilt University; 2008. Available from: http://hdl.handle.net/1803/13732

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


Vanderbilt University

2. Winkelmann, Anna. Design, Modeling, and Experimental Validation of a Stirling Engine with a Controlled Displacer Piston.

Degree: MS, Mechanical Engineering, 2015, Vanderbilt University

URL: http://hdl.handle.net/1803/10723 

This work presents the design, first-principles model, and experimental setup of a Stirling pressurizer. The Stirling pressurizer is a Stirling engine with an independently controlled displacer piston. The directly controlled, loose-fit displacer is actuated with a small linear motor and moves the pre-pressurized working fluid (helium) between the hot and cold side of the sealed engine section; therefore inducing a pressure change. The position of the displacer is the only control input to the first-principles model. The first-principles model is validated with experimental results for different controlled displacer piston motion profiles. Modeled and experimentally measured pressures are compared for average pressures ranging from 10 – 20 bar, and heater head temperatures ranging from 250°C – 500°C. The first-principles model is intended for: 1) the design and sizing of the pressurizer and power piston / power extraction, 2) specification of a displacer piston motion profile to optimize the efficiency and/or power output, and 3) the general design of Stirling devices, beyond the design of the experimental prototype investigated here, through the use of a lumped parameter model with well-defined and measurable parameters. The Stirling pressurizer combined with a power extraction unit is intended to fill the technological gap of a compact, quiet, un-tethered, and high energy density power supply. Advisors/Committee Members: Dr. Michael Goldfarb (committee member), Dr. Alvin Strauss (committee member), Dr. Eric J. Barth (Committee Chair).

Subjects/Keywords: Stirling Engine; high energy density power supply

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

APA (6th Edition):

Winkelmann, A. (2015). Design, Modeling, and Experimental Validation of a Stirling Engine with a Controlled Displacer Piston. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10723

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):

Winkelmann, Anna. “Design, Modeling, and Experimental Validation of a Stirling Engine with a Controlled Displacer Piston.” 2015. Thesis, Vanderbilt University. Accessed January 21, 2021. http://hdl.handle.net/1803/10723.

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

MLA Handbook (7th Edition):

Winkelmann, Anna. “Design, Modeling, and Experimental Validation of a Stirling Engine with a Controlled Displacer Piston.” 2015. Web. 21 Jan 2021.

Vancouver:

Winkelmann A. Design, Modeling, and Experimental Validation of a Stirling Engine with a Controlled Displacer Piston. [Internet] [Thesis]. Vanderbilt University; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/1803/10723.

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

Council of Science Editors:

Winkelmann A. Design, Modeling, and Experimental Validation of a Stirling Engine with a Controlled Displacer Piston. [Thesis]. Vanderbilt University; 2015. Available from: http://hdl.handle.net/1803/10723

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

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