Assessment of the In-House Laboratory Independent Research at the Army's Research, Development, and Engineering Centers (2020) / Chapter Skim
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6 Materials Science
6 Materials Science
Pages 55-77
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From page 55... ...
ARMAMENT RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER Project: Atomic and Multiscale Modeling of Tungsten Crystal Lattice Defects Created by Neutron Bombardment for Increasing Fracture Toughness The goal of this project was to model both the solid solution hardening of tungsten single crystals and the interaction of dislocation movements through molecular dynamics simulations. The project has technological relevance to the Army for ballistic and ordinance applications.
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From page 56... ...
Costa, 2018, "Atomic and Multiscale Modeling of Tungsten Single Crystal Dislocation Interactions with Stress Fields Created by Bigger Solute Atoms," ARDEC presentation to the Panel on Review of In-House Laboratory Independent Research in Materials Science at the Army's Research, Development, and Engineering Centers, December 13, Washington, D.C.
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From page 57... ...
Advanced finite element analysis (FEA) modeling is very useful in designing any structural component, particularly components that encounter dynamic strain effects, such as military vehicles in rough terrain or impact situations.
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From page 58... ...
The researchers demonstrated that alterations in the density of surface hydroxyl groups on silicon dioxide substrates can control nucleation and growth in molybdenum disulfide thin films, which are produced by atmospheric pressure chemical vapor deposition. The extent of MoS2 nucleation is linearly correlated to the density of surface hydroxyl groups.
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From page 59... ...
It was not made clear what temperature is being targeted or what temperatures were used for the films that were produced. For the films that were manufactured, the measured capacitance decreased by increasing the electric field, and this was interpreted by the researcher as a result of a decrease in the electric permittivity of the dielectric material.
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From page 60... ...
Customizing the catalyst composition and geometry may prove to be a valuable optimization vector if performed in coordination with the constraints of the turbine on the chemistry of the fuel. EDGEWOOD CHEMICAL BIOLOGICAL CENTER Project: Hierarchical Systems Through Selective Deposition and Growth of Metal-Organic Frameworks on Block Copolymers This project relates to a Ph.D.
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From page 61... ...
NATICK SOLDIER RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER Project: Modeling and Quantifying Nano-Enhanced Scattering in Polymers This is a very successful project, completed after 3 years and $1.7 million of effort. The project has three thrusts: nano-enhanced scattering for enhanced light absorption in thin films, bioinspired control of scattering and polymer-based enhancement for infrared (IR)
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From page 62... ...
Broadly, the research seeks to understand the basic mechanisms of scattering of nanoscale optical materials in order to create greatly improved material systems (metamaterials) for novel applications, particularly those that can be embodied in textile fibers and in thin films of lightweight materials.
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From page 63... ...
The project resulted in the filing of a provisional patent,7 which was filed on September 17, 2018, two peer-reviewed publications,8,9 and two conference presentations.10,11 The key technical goal of attaching carbon nanotubes with interchangeable chemical sensing groups to interchangeable surfaces has been achieved. The sensor array that was developed is the most sensitive chemiresistive CO2 sensor that has been reported.
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From page 64... ...
It would also be beneficial to examine the influence of the oriented polymer on the anchoring conditions to the LC component because the orientation of the cholesteric pitch axis is normal to the orientation of the director. It is also important to monitor how incorporation of an LC phase within the polymer fiber influences the mechanical properties of the fiber.
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From page 65... ...
Tzelepis, 2018, "Computational Design and Development of Polyurea-Based Adhesives," TARDEC, presentation to the Panel on Review of In-House Laboratory Independent Research in Materials Science at the Army's Research, Development, and Engineering Centers, December 12, Washington, D.C.
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From page 66... ...
Project: Demonstration of New Time-Dependent Reliability Method on Military Vehicle Suspension Components Using Up-Crossing and Joint Up-Crossing Rate The goal of the project is to improve understanding and predictive capability of component failure in ground vehicles subject to stochastic loading histories. The project focuses specifically on cyclic fatigue failure of suspension springs.
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From page 67... ...
These points were germane to 13 I Baseski, 2018, "Development of Test Methodology for Suspension Component Characterizations in the Laboratory," ARDEC, presentation to the Panel on Review of In-House Laboratory Independent Research in Materials Science at the Army's Research, Development, and Engineering Centers, December 12, Washington, D.C.
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From page 68... ...
Project: Fundamental Study on the Suppression of Dendrite Growth in Lithium-Metal Batteries via Carbon Nanoribbons through In-Situ Optical Microscopy The focus of this work is to understand the fundamental phenomena of dendrite formation in lithium metal batteries under different external (e.g., temperature and charge/discharge) conditions and the mechanism of the dendritic growth suppression.
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From page 69... ...
14 J Walker, 2018, "Integrated Micromixers and Acoustic Streaming to Prevent Reverse Osmosis Membrane Fouling," T ARDEC, presentation to the Panel on Review of In-House Laboratory Independent Research in Materials Science at the Army's Research, Development, and Engineering Centers, December 12, Washington, D.C.
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From page 70... ...
The concept is relevant to structural health monitoring (damage monitoring) , which is needed for military vehicles and other ground systems.
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From page 71... ...
The reported conclusions were that the thickness-side of DIC measurements differs more from theoretical strain value than front-side DIC measurements, and that various factors may influence the inherent bias/deviation of double-side DIC setup.15 The purported relevance 15 B Sia, 2018, "Noise and Error Assessment for 3D Digital Image Correlation Systems Set Up for Simultaneous Measure ment of Multiple Sides," TARDEC, presentation to the Panel on Review of In-House Laboratory Independent Research in Materials Science at the Army's Research, Development, and Engineering Centers, December 12, Washington, D.C.
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From page 72... ...
It would also be useful to expand the scope of the activity from one-off demonstrations of the methodology to the evaluation of more generic, perhaps simpler, component geometries, with the goal of developing greater fundamental understanding of underlying design principles. Project: On the Feasibility of Electromagnetic Treatments for Relieving Residual Stress in Welded Armor Plates The project is an empirical evaluation of the opportunity for electromagnetic treatments to relieve residual stresses in welded armor plates (both MIL–DTL 12560 and 46100 steel armor alloys)
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From page 73... ...
(relevant to the project Parametric Optimization of Thermal Controlled Friction Stir Welding of Thick Al-Cu-Mg-Ag Alloy Plates) , suspension component testing and reliability (relevant to the projects Development of Test Methodology for Suspension Component Characterizations in the Laboratory and Demonstration of New Time Dependent Reliability Method on Military Vehicle Suspension Components Using Up-Crossing and Joint Up-Crossing Rate)
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From page 74... ...
Project: Quantum Modeling of Woven 3D Graphene Through Computational Materials Science The objective for this project was to investigate the possibility that graphene sheets could be interlinked using chemical vapor deposition on a poly-Ni (polycrystalline nickel) substrate.
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From page 75... ...
The project Feasibility of Electromagnetic Treatments for Relieving Residual Stress in Welded Armor Plates could be improved by outside collaborations, and, as mentioned, Oak Ridge National Laboratory would be an ideal collaborator for neutron diffraction measurement. TARDEC projects could also benefit from enhanced collaborations with other Army laboratories (e.g., ARL, ARO, and ARDEC)
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From page 76... ...
The project Fundamental Study on the Suppression of Dendrite Growth in Lithium-Metal Batteries via Carbon Nanoribbons Through In-Situ Optical Microscopy could have benefited from a more in-depth literature search on various formulations of carbonaceous materials to better support the uniqueness of CNR selection and further the understanding of its role in dendrite suppression. In the project Noise and Error Assessment for 3D Digital Image Correlation Systems Set Up for Simultaneous Measurement of Multiple Sides the apparent lack of familiarity with related literature undoubtedly contributed to project shortcomings.
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From page 77... ...
This was particularly apparent on the projects Fundamental Study on the Suppression of Dendrite Growth in Lithium-Metal Batteries via Carbon Nanoribbons Through In-Situ Optical Microscopy, and Noise and Error Assessment for 3D Digital Image Correlation Systems Set Up for Simultaneous Measurement of Multiple Sides. Recommendation: ARDEC and TARDEC should provide greater mentorship and oversight to junior staff members.
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