期刊
COMPOSITE STRUCTURES
卷 93, 期 12, 页码 3104-3111出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2011.06.025
关键词
Carbon fibers; Lattice structure; Hollow truss; Failure mode; Compressive properties; Energy absorption
资金
- NSFC [90816024, 10872059]
- 973 Program [2011CB610303]
- Program for NCET [NCET-08-0152]
- Program of Excellent Team in HIT
- Fundamental Research Funds for the Central Universities [HIT. KLOF2010029]
- M.C. Gill Composites Center
- Most Promising New Scholar Award [AUDQ1010000511]
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. (C) 2011 Elsevier Ltd. All rights reserved.
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