期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 119, 期 -, 页码 26-33出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2015.09.022
关键词
Octet-truss lattice; Elastic stiffness; Strength; Carbon fiber composite
资金
- DARPA MCMA program [W91CRB-10-1-005]
Octet-truss lattice structures have been made from balanced [0/90] carbon fiber reinforced polymer (CFRP) laminates using a simple snap-fit method. The lattice structures moduli and strengths have been measured during [001] and [100] directions free compressions as a function of the lattice relative density. Core failure occurred by either (i) Euler buckling ((rho) over bar < 5%) or (ii) delamination dominated failure (<(rho)over bar> > 5%) of the struts. The measurements are shown to be well predicted by micromechanics models of these composite strut failure modes. Snap-fit CFRP octet-truss lattice structures are found to exhibit mechanical properties competitive with other cellular materials and topologies. Their isotropic response may provide new opportunities for ultra-lightweight multiaxial loaded structures. (C) 2015 Elsevier Ltd. All rights reserved.
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