Mechanical properties of 3-D printed truss-like lattice biopolymer non-stochastic structures for sandwich panels with natural fibre composite skins
CHEN, Yong Kang
Pearce, Joshua M.
A full mechanical characterisation of three types of 3-D printed lattice cores was performed to evaluate the feasibility of using additive manufacturing (AM) of lightweight polymer-based sandwich panels for structural applications. Effects of the shape of three selected lattice structures on the compression, shear and bending strength has been experimentally investigated. The specimens tested were manufactured with an open source fused filament fabrication-based 3-D printer. These sandwich structures considered had skins made of polypropylene (PP)-flax bonded to the polylactic acid (PLA) lattice structure core using bi-component epoxy adhesive. The PP-flax and the PLA core structures were tested separately as well as bonded together to evaluate the structural performance as sandwich panels. The compression tests were carried out to assess the in-plane and out of plane stiffness and strength by selecting a representative number of cells. Shear band and plastic hinges were observed during the in-plane tests. The shear and three-point bending tests were performed according to the standard to ensure repeatability. The work has provided an insight into the failure modes of the different shapes, and the force-displacement history curves were linked to the progressive failure mechanisms experienced by the structures. Overall, the results of the three truss-like lattice biopolymer non-stochastic structures investigated have indicated that they are well suited to be used for potential impact applications because of their high-shear and out of the plane compression strength. These results demonstrate the feasibility of AM technology in manufacturing of lightweight polymer-based sandwich panels for potential structural uses
Published inComposite Structures
RelationsSchool of Engineering and Technology
MetadataShow full item record
Showing items related by title, author, creator and subject.
Structural invariance, structural definability and the Galois theory of elementarily invariant structures Broido, J. (University of Hertfordshire, 1997)Suppose A and B are two adequately described structures- can we decide whether and how A is interpretable in terms of B? The question itself is in need of interpretation, of course. In different contexts, the term ...
Structural invariance, structural definability and the Galois theory of elementarily invariant structures Broido, J. (University of Hertfordshire, 1995)
Anthony, T.; Polani, D.; Nehaniv, C.L. (MIT Press, 2008)We investigate the correlation between the information theoretic measure of empowerment and the graph theoretic measure of closeness centrality, to better understand the structural conditions that must exist in a world for ...