Pyramidal lattice sandwich structures with hollow composite trusses |
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Authors: | Sha Yin Linzhi Wu Li Ma Steven Nutt |
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Affiliation: | 1. Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China;2. Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-0241, USA |
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Abstract: | Pyramidal lattice sandwich structures with hollow composite trusses were fabricated using a thermal expansion molding approach. Composite lattice structures with three relative densities were fabricated with two fiber architectures and the out-of-plane compression properties were measured and compared. Lattice cores with a fraction of carbon fibers circumferentially wound around the hollow trusses (Variant 2) exhibited superior mechanical properties compared with similar structures comprised of unidirectional fibers (Variant 1). The out-of-plane compressive properties of composite pyramidal lattice structures in Variant 2 were well-matched by analytical predictions. Unusual strain hardening behavior was observed in the plateau region for Variant 2, and the energy absorption capabilities were measured and compared with the similarly constructed silicone rubber–core truss pyramidal lattice structures (Variant 3). The energy absorption per unit mass of selected hollow truss composite lattice structures reported here surpassed that of both hybrid truss counterparts (Variant 3) and hollow truss metallic lattice structures. |
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Keywords: | Carbon fibers Lattice structure Hollow truss Failure mode Compressive properties Energy absorption |
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