In this climate of declining budgets and resources, models and simulations (M&S) have become very beneficial to the U.S. Navy. However, the U.S. Navy's investment in, and use of, M&S for addressing critical operational issues (COIs) within a warship's operational test (OT) program would not be practical unless the particular M&S was determined to be a credible representation of that which would be physically tested. Commander Operational Test and Evaluation Force (COMOPTEVFOR) is responsible for accrediting U.S. Navy M&S that are required to support OT. COMOPTEVFOR has developed a VV and A process that is documented in COMOPTEVFORINST 5000.1A. This instruction requires all surface ship acquisition program managers (PMs) to develop a Validation and Verification (V and V) plan that would meet COMOPTEVFOR's expectations for likely accreditation. This thesis will identify the extent to which surface ship PMs are complying with COMOPTEVFORINST 5000.1A; why they are not in full compliance with the instruction; what incentives would help them comply with the instruction; and what improvements can be made to the instruction that would increase compliance by the PMs. Finally, this thesis will conclude with recommendations that would help increase compliance with the instruction by the PMs. / Department of the Navy (civilian) authors.

Thesis (M.A.)--East Carolina University, 2009. / Presented to the faculty of the Department of History. Advisor: Lawrence Babits. Includes bibliographical references (leaves [125]-136). Also available via the World Wide Web. Adobe reader required.

In this work, the development of theoretically-dense, clean grain boundary, high hardness solid-state sintered silicon carbide (SiC) armor was pursued. Boron carbide and graphite (added as phenolic resin to ensure the carbon is finely dispersed throughout the microstructure) were used as sintering aids. SiC batches between 0.25-4.00 wt.% carbon were mixed and spray dried. Cylindrical pellets were pressed at 13.7 MPa, cold-isostatically pressed (CIP) at 344 MPa, sintered under varying sintering soaking temperatures and heating rates, and varying post hot-isostatic pressing (HIP) parameters. Carbon additive amounts between 2.0-2.5 wt.% (based on the resin source), a 0.36 wt.% B4C addition, and a 2050°C sintering soak yielded parts with high sintering densities (~95.5-96.5%) and a fine, equiaxed microstructure (d50 = 2.525 µm). A slow ramp rate (10°C/min) prevented any occurrence of abnormal grain growth. Post-HIPing at 1900°C removed the remaining closed porosity to yield a theoretically-dense part (3.175 g/cm3, according to rule of mixtures). These parts exhibited higher density and finer microstructure than a commercially-available sintered SiC from Saint-Gobain (Hexoloy Enhanced, 3.153 g/cm3 and d50 = 4.837 µm). Due to the optimized microstructure, Verco SiC parts exhibited the highest Vickers (2628.30 ± 44.13 kg/mm2) and Knoop (2098.50 ± 24.8 kg/mm2) hardness values of any SiC ceramic, and values equal to those of the "gold standard" hot-pressed boron carbide (PAD-B4C). While the fracture toughness of hot-pressed SiC materials (~4.5 MPa m1/2) are almost double that of Verco SiC (2.4 MPa m1/2), Verco SiC is a better performing ballistic product, implying that the higher hardness of the theoretically-dense, clean-grain boundary, fine-grained SiC is the defining mechanical property for optimization of ballistic behavior.