A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
This article gives a brief overview of the opportunities provided by applying topology concepts, in conjugation with fabrication, to create new classes of robust, lightweight panels made from structural alloys. The new developments to be addressed in this article arise in topology optimization. Novel categories of topologically designed metallic alloys are addressed in this article. The metals are configured in truss-like arrangements with open domains that occupy more than 90% of the volume. A procedure has been established for selecting the materials most applicable to aerospace structures, which are limited by their ability to support bending and compressive load. The associated metrics are encapsulated as diagonals superposed on maps of Youngs's modulus, as a function of density and yield strength. Minimum weight designs are found by identifying the failure modes, specifying the stiffness or load capacity, and then varying the dimensions to determine the lowest weight for each mode. The preferred topology depends on the configuration (flat or curved) and the loading (bending or compression). Among all possible truss topologies tetragonal and pyramidal trusses and a plain-weave diamond panel are discussed. The results are presented for situations wherein the trusses fail by yield/plastic buckling. These are the common failure modes for optimized metallic panels. Topologies have been identified that allow the truss member to resist bending, resulting in minimum possible weight. Models have been devised that relate the overall performance of the panel to the architecture of the core and to the properties of the constituent alloys. The models have been validated through measurements of the load capacity in bending, conducted on panels fabricated by investment casting and textile core-based concepts. Metrics have been presented that allow competing concepts to be compared and, consequently, permit the specific weight benefits of the new systems to be defined.
This article gives a brief overview of the opportunities provided by applying topology concepts, in conjugation with fabrication, to create new classes of robust, lightweight panels made from structural alloys. The new developments to be addressed in this article arise in topology optimization. Novel categories of topologically designed metallic alloys are addressed in this article. The metals are configured in truss-like arrangements with open domains that occupy more than 90% of the volume. A procedure has been established for selecting the materials most applicable to aerospace structures, which are limited by their ability to support bending and compressive load. The associated metrics are encapsulated as diagonals superposed on maps of Youngs's modulus, as a function of density and yield strength. Minimum weight designs are found by identifying the failure modes, specifying the stiffness or load capacity, and then varying the dimensions to determine the lowest weight for each mode. The preferred topology depends on the configuration (flat or curved) and the loading (bending or compression). Among all possible truss topologies tetragonal and pyramidal trusses and a plain-weave diamond panel are discussed. The results are presented for situations wherein the trusses fail by yield/plastic buckling. These are the common failure modes for optimized metallic panels. Topologies have been identified that allow the truss member to resist bending, resulting in minimum possible weight. Models have been devised that relate the overall performance of the panel to the architecture of the core and to the properties of the constituent alloys. The models have been validated through measurements of the load capacity in bending, conducted on panels fabricated by investment casting and textile core-based concepts. Metrics have been presented that allow competing concepts to be compared and, consequently, permit the specific weight benefits of the new systems to be defined.
Lightweight materials and structures
Leichte Materialien und Strukturen
Evans, A.G. (author)
MRS Bulletin ; 26 ; 790-797
2001
8 Seiten, 11 Bilder, 32 Quellen
Article (Journal)
English
Leichtbauweise , Platte (Bauteil) , Legierung , Topologie , Fachwerk , Anwendungsbeispiele , Luftfahrt , Young-Modul , Dichte , Streckgrenze , Versagen , Steifigkeit , Belastbarkeit , Abmessung (Auslegung) , Gewicht , Biegebeanspruchung , Verdichtung , Diamant , Gewebebindung , Knicken , Modell , Feingießverfahren , Textilien
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