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• W4317633845 abstract "Searing hot temperatures, crushing pressure, and a corrosive atmosphere make Venus one of the most inhospitable destinations in our solar system. As a result, no long lived exploratory missions have been conducted on its surface. These ambient conditions severely constrain the materials that can survive unprotected on Venus, however they are a boon to create a platform for planetary exploration with unprecedented mobility and payload capacity. The constraints posed by these conditions and recent advances in architected materials admit an unlikely solution for a novel aerial platform to operate on Venus-- a vacuum airship. This vehicle requires a lighter than gas envelope that is evacuated of all fluid and can resist the external pressure of the atmosphere acting on it. Here, it is investigated whether low density truss-lattice type architected materials can support a thin film envelope subjected to the pressure found on the surface of Venus. Selection of the architecture and its subsequent optimization for this application are discussed. The shape of the struts in the lattice are the primary target of optimization with the goals of increasing strength for a given density. The struts are taken as solid and annular cross sections with variable cross-section. Optimization is conducted using the covariance matrix adaptation evolution strategy (CMA-ES) and high highly resolved finite element models for accurate calculation of elastic properties, critical buckling loads, and the local stress fields. Failure by buckling, tensile rupture, and shear are considered. An extended Mohr-Coulomb model is used for the shear failure criterion, since the highest stress regions in the optimized BAM designs have a nearly spherical stress state. It is found that the optimized BAM design can withstand the extreme loading and enable this new aerial platform to operate on Venus." @default.
• W4317633845 created "2023-01-21" @default.
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• W4317633845 date "2023-01-19" @default.
• W4317633845 modified "2023-10-17" @default.
• W4317633845 title "Design of Buoyant Architected Materials to Enable a New Aerial Platform Operating Near the Surface of Venus" @default.
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• W4317633845 doi "https://doi.org/10.2514/6.2023-1521" @default.
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