Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xvi, 156 p.; also includes graphics (some col.). Includes bibliographical references (p. 150-156). Available online via OhioLINK's ETD Center

Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008. / Garmestani, Hamid, Committee Member ; Johnson, Steven, Committee Chair ; McDowell, David, Committee Member ; Qu, Jianmin, Committee Co-Chair ; Cherkaoui, Mohammed, Committee Co-Chair.

Thesis (Ph. D.)--Lehigh University, 2003. / Includes vita. Includes bibliographical references (leaves 118-123).

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Thesis (M.S. in materials science and engineering)--Washington State University, May 2009. / Title from PDF title page (viewed on Apr. 2, 2009). "School of Mechanical and Materials Engineering." Includes bibliographical references.

Thesis (Ph. D.)--Drexel University, 2005. / Includes abstract and vita. Includes bibliographical references (leaves 95-101).

Thesis (Ph.D.)--Drexel University, 2009. / Includes abstract and vita. Includes bibliographical references (leaves 116-125).

Thesis (Master's)--University of California, Berkeley, 1962. / "UC-25 Metals, Ceramics, and Materials" -t.p. "TID-4500 (17th Ed.)" -t.p. Includes bibliographical references (p. 61-63).

A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial fulfillment of the requirements for the degree of Master of Science in Engineering, School of Mechanical, Industrial & Aeronautical Engineering, 2017 / An investigation of polycrystalline diamond compact (PDC) cutter failures, which are industrially known as spalling, was conducted by exploring changes in the diamond layer architecture and edge geometry of the cutter. Layer architecture was investigated through the use of layered functionally graded (FG) structures. Twenty one FG variations were prepared by the tape casting method and sintered using a high-pressure, high-temperature press. The vertical borer test (VBX), a laboratory test method, was used to gauge the improvement in spall resistance of the FG specimens against the benchmarks. Due to cost constraints associated with VBX testing, of the 21 available specimens, only four variations were tested for spalling. Contrary to expectation, it was found that all four specimens spalled during VBX testing despite showing a slight improvement in the spall area. For this reason, this route was abandoned. It was concluded that the use of layered structures is not effective in resolving the spalling problem. The use of novel edge geometry was investigated by taking three standard products and creating new geometric profiles on the specimens using a spark erosion machine. Each profile comprised a depression on the front face of the cutter. The specimens with novel geometry were also tested on the VBX. The spall was found to be confined between the chamfer breach and the depression feature. The depression appeared to have stopped the spall from propagating beyond the allowable spall limit of 1.2mm. On the basis of this 3 finding, it was concluded that spalling was successfully resolved. It is recommended that further optimization of this solution should be explored in field testing. In addition, a cost-effective way to fabricate the geometric profiles on the cutters should be further investigated because creating specimens using the spark erosion machine was quite expensive. Therefore, it is not viable for fabrication of large production volumes / CK2018