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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Positivity-preserving cell-centered Lagrangian schemes for multi-material compressible flows: From first-order to high-orders. Part I: The one-dimensional case
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SIMULATING RESIDUAL STRESSES IN SIMPLE MULTI-MATERIAL COMPOSITE STRUCTURES.
Abstract not provided.
MULTI-MATERIAL STRUCTURAL TOPOLOGY OPTIMIZATION UNDER UNCERTAINTY VIA A STOCHASTIC REDUCED ORDER MODEL APPROACH.
Abstract not provided.
MULTI-MATERIAL STRUCTURAL TOPOLOGY OPTIMIZATION UNDER UNCERTAINTY VIA A STOCHASTIC REDUCED ORDER MODEL APPROACH.
Abstract not provided.
Thermal Concentrator Design Enabled by Multi-Material 3D Metal Printing.
Abstract not provided.
Simulating Residual Stresses in Simple Multi-Material Composite Structures.
Abstract not provided.
Multi-Material Interface Tracking for Enriched Finite Element Methods.
Abstract not provided.
XFEM for 2- and 3-D Multi-Material Eulerian Hydrodynamics in ALEGRA.
Abstract not provided.
Tailorable Adhesives for Multi-material Joining, Facile Repair and Re-assembly
Joining of materials and components is inevitable as it allows versatility in assembly and repair along with reduction in time and cost of manufacturing. This work uses ‘active adhesives’ that inherit all the benefits of bonded joints, such as lightweight, eliminate holes and associated stress-concentrations, and overcomes the shortcomings of disassembly and repair. Thermoplastic adhesives modified by the incorporation of electrically conductive graphene nanoplatelets at a concentration above the percolation point provide a unique synergy of mechanical, thermal and electrical properties. While the choice of the thermoplastic is governed by the desired application the addition of the graphene nanoplatelets allows energy to be deposited primarily in the adhesive. The percolated network of graphene particles in the adhesive at less than 2% can quickly couple to high frequency radiation (microwave, or MW) via non-contact methods and increase the adhesive temperature to above the required processing temperatures. The adhesive melts and flows over the adherends and upon cooling forms a structural adhesive bond. Furthermore, the process can be used to disassemble the adhesive joint if repair or reworking is required. In this work, the concept of aforementioned active adhesives was studied using varying graphene contents in nylon-6 adhesive. Activation and re-assembly was studied on in-plane (lap-shear) joints. Structural behavior of re-assembled joints was found to be similar to thermally bonded joints. Overall, active adhesives such as the ones attempted in this work have a great potential in a wide range of applications wherein in-situ repair, re-assembly and recyclability are essential.
Integration of Mesh Adaptivity with a High-Deformation Multi-Material Simulation.
Abstract not provided.
Applying Algebraic Multigrid Methods to Dynamic Enriched Conformal Decomposition Finite Element Methods for Multi-material Transport.
Abstract not provided.
Multi-Material Direct Energy Deposition for Custom Alloy Compositions.
Abstract not provided.
Multi-material dynamic domain topology changes in the Lagrangian Grid Reconnection (LGR) code.
Abstract not provided.
A Modular Direct Write Additive Manufacturing Approach in the Printing of Multi-Materials and Alumina.
Abstract not provided.
Process Development for the In-Situ Mixing of Multi Material Feed Stock in Additive Manufacturing.
Abstract not provided.