http://materialsdata.nist.gov:80 The Materials Data digital repository system captures, stores, indexes, preserves, and distributes digital research material. 2026-03-11T16:43:05Z https://hdl.handle.net/11256/1005 Testing Military-Grade Adhesive in Extreme Loading Conditions Deschepper, Daniel; Gray, David; Moy, Paul; Walter, Timothy; Jensen, Robert; Pollum, Marvin; Hellerman, Edward; Kriley, Joseph; Nakajima, Masa; Rearick, Brian Military performance requirements for adhesives have been traditionally derived to fulfill niche defense needs in harsh operational environments with little consideration for dual-use commercial potential. The drawback with this approach is dwindling defense acquisition access to leading-edge commercially sustainable products, as the market drivers for purely non-defense applications are significantly larger. MIL-PRF-32662, Adhesive, High-Loading Rate, for Structural and Armor Application, is based on a decade of rigorous research efforts to statistically correlate the complex ballistic response of adhesively bonded armor assemblies to universally translatable and commercially relevant mechanical properties. These military performance thresholds were deliberately defined at just beyond state-of-the-art based on a statistical survey of commercially available adhesives. The end results are performance criterion for MIL-PRF-32662 that are difficult, but not impossible, to meet with the intention of attracting commercial interest. The objective of this experimental work is to quantify adhesive performance defined by “harsh military operational environments” against a suitable non-military harsh use condition. The result of this study shows a 32% increase in static load retention strength of an adhesive formulated to meet MIL-PRF-32662 Group 1 requirements when tested in the tensile butt joint geometry specified by Guinness World Records. These results offer further encouragement to explore the potential of military performance specifications as agents of change in leading technical advances in dual-use market sectors. https://hdl.handle.net/11256/1003 Calculated Collision Welding Process Windows in Acoustic, Elastic, and Shock Approximations Barnett, Blake Collision welding is a solid-state joining process which uses shock pressures developed during impact to metallurgically bond flyer and target plates. Various analytical expressions have been developed to describe the process boundaries for ideal welds in the welding velocity-impact angle plane. Existing process boundaries assume symmetric weld members, and/or symmetric post-impact weld behavior (stress partitioning and propagation velocities, peak temperatures, and cooling rates) which are not applicable to the majority of collision welding applications, which use dissimilar weld members. This work extends and modifies existing weld window boundaries through the application of elementary shock physics (Rankine-Hugoniot Relations) via discrete numerical calculations for permutations of weld pairs across approximately 30 elemental and alloy metals. Existing formulations of relevant process boundaries are also included for completeness. The MATLAB program used to generate the datasets and associated plots can be found on GitHub at: https://github.com/BBarnett-615/Collision-Welding-Process-Window-Calculator https://hdl.handle.net/11256/1002 PPG PR-2930 MIL-PRF-32662A qualification data PPG PR-2930 MIL-PRF-32662 test data https://hdl.handle.net/11256/998 Development of a Diffusion Mobility Database for Co-based Superalloys Campbell, Carelyn; Lindwall, Greta; Moon, Kil-won; Williams, Maureen; Tso, Whitney To facilitate the development of high-temperature Co-based gamma-gamma prime superalloys, a Co-Ni based diffusion mobility database is developed for the eight component FCC (Face Centered Cubic) system of Co-Al-W-Ni-Cr-Ti-Ta-Re. A CALPHAD approach is used to represent the temperature and composition dependency of the multicomponent system. The mobility descriptions are based on previous assessment work for the Ni-based superalloys, published experimental and computational data, and established diffusion correlations. The initial mobility descriptions were then refined using additional diffusion couple experimental data, particularly for the Co-Cr, Co-Ta, and Ni-Ta systems. After re-optimizing the descriptions with the new experimental data, the mobility descriptions were validated using a collection of published diffusion couple composition profiles, which were not included in the initial assessment process.