Biomimetic systems and design in the 3D characterization of the complex vascular system of bamboo node based on X-ray mi
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Biomimetic systems and design in the 3D characterization of the complex vascular system of bamboo node based on X-ray microtomography and finite element analysis Felipe Luis Palombini1,a) , Fernanda Mayara Nogueira2, Wilson Kindlein Junior3, Sidnei Paciornik4, Jorge Ernesto de Araujo Mariath5, Branca Freitas de Oliveira6 1
Graduate Program in Design—PGDesign, Federal University of Rio Grande do Sul—UFRGS, Porto Alegre, RS 90035-190, Brazil Laboratory of Plant Anatomy—LAVeg, Department of Botany—UFRGS, Institute of Biosciences, Porto Alegre, RS 91540-000, Brazil; and Graduate Program in Botany, Institute of Biosciences—UFRGS, Porto Alegre, RS 91540-000, Brazil 3 Graduate Program in Design—PGDesign, Federal University of Rio Grande do Sul—UFRGS, Porto Alegre, RS 90035-190, Brazil; and Department of Materials—DEMAT, Federal University of Rio Grande do Sul—UFRGS, Porto Alegre, RS 90035-190, Brazil 4 Department of Chemical and Materials Engineering—DEQM, Pontifical Catholic University of Rio de Janeiro—PUC-Rio, Rio de Janeiro, RJ 22453-900, Brazil 5 Laboratory of Plant Anatomy—LAVeg, Department of Botany—Federal University of Rio Grande do Sul—UFRGS, Institute of Biosciences, Porto Alegre, RS 91540-000, Brazil 6 Graduate Program in Design—PGDesign, Federal University of Rio Grande do Sul—UFRGS, Porto Alegre, RS 90035-190, Brazil; and Department of Design and Graphic Expression—DEG, Federal University of Rio Grande do Sul—UFRGS, Porto Alegre, RS 90035-190, Brazil a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 27 January 2019; accepted: 8 March 2019
Bamboo is a natural composite and one of the most efficient structures in nature because of the relationship of mechanical properties with its microstructural features. This research presents the 3D characterization of the reinforcement bundles of a branching nodal region of bamboo, through high-resolution X-ray microtomography (lCT). lCT was used to characterize a sample regarding the volume, relative density, and porosity of parenchyma and sclerenchyma tissues, and the resulting data were used to estimate their constitutive properties. A nonlinear finite element analysis (FEA) was performed based on a discretized model of the lCT to the limiting compressive load. Secondary bundles presented an interweaved arrangement into the primary vascular elements that distribute axial compressive stresses into new branches. Our findings suggest that the foam-like behavior of the parenchyma, the sclerenchyma thickening above the nodal zone, and the nodal vascular branching are ways for bamboo to protect important tissues from mechanical stress by allocating axial loads. In addition, such mechanism could be applied in the design of biomimetic structures with selective loadbearing capabilities. Felipe Palombini received his M.Sc. (2016) and his Ph.D. (2019) in the Graduate Program in Design (PGDesign), in the School of Engineering of the Federal University of Rio Grande do Sul (UFRGS), in
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