Abstract A folding fabrication method inspired by origami for carbon fiber-reinforced composites to fabricate three-dimensional structures is presented. PMI foams serve as substrates, making it possible to manufacture this kind of origami-inspired composite sandwich materials in a single-step process. Analytical models are proposed to provide upper and lower bounds of the out-of-plane compressive strength of the origami-inspired composite sandwich materials. Finite element analysis (FEA) and experiments are conducted to characterize the compressive behaviors including the deformation history, failure mode, strength, etc., and verify the validity of the analytical models. By incorporating PMI foams, the out-of-plane compressive failure mode of the composite sandwich material at low relative density changes from buckling to wrinkling or crushing, thus greatly increasing the strength. Additionally, the energy absorption capacity is significantly enhanced due to the PMI foams and their interaction with the composite origami core. This work creates a new method to fold composites into lightweight sandwich materials with high strength and high energy absorption, paving the way for their applications in transport, energy and communication.
#1Yuntong Du(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 1
#2Thomas Keller(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
Last. Jian Xiong(HIT: Harbin Institute of Technology)H-Index: 28
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Abstract A methodology for designing cylindrical origami with different patterns and different cross-sectional shapes is presented. Planar and cylindrical origami with curved-crease patterns are designed and proved to be foldable and developable regardless of the type of crease line. Specifically, cylindrical origami structures with arc-Miura pattern and circular cross section, arc pattern and circular cross section, arc-Miura pattern and triangular cross section, arc pattern and triangular cros...
#2James O’Neil(UW: University of Washington)H-Index: 2
Last. Jinkyu Yang(UW: University of Washington)H-Index: 26
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Abstract Deployable structures are typically made of thin membranes and slender elements, which often require foldable – yet stiff – mechanical properties. The use of carbon fiber reinforced polymer (CFRP) composites for such deployable structures has been limited due to the their rigid and unfoldable nature in general. Here, we design, fabricate, and demonstrate foldable – yet stiff – structures made of CFRP composites. To achieve this, we leverage origami design principles based on the Tachi-M...
#1Sang-Min Baek(SNU: Seoul National University)H-Index: 4
#2Sojung Yim(SNU: Seoul National University)H-Index: 2
Last. Kyu-Jin Cho(SNU: Seoul National University)H-Index: 34
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Origami can enable structures that are compact and lightweight. The facets of an origami structure in traditional designs, however, are essentially nondeformable rigid plates. Therefore, implementing energy storage and robust self-locking in these structures can be challenging. We note that the intricately folded wings of a ladybird beetle can be deployed rapidly and effectively sustain aerodynamic forces during flight; these abilities originate from the geometry and deformation of a specialized...
Last. Yan Chen(TJU: Tianjin University)H-Index: 28
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Abstract Origami-inspired metamaterials are receiving increasing attention because they can provide unusual and favorable mechanical properties that are determined by their unique patterned geometry. In this paper, a novel design based on Miura-ori pattern, with varying geometries throughout its volume, is proposed and analyzed under quasi-static compression. Both experiments and numerical simulations indicate that the new design, both two-dimensional graded (2DG) and three-dimensional graded (3...
Abstract In this paper, the crushing behaviors of composite pre-folded tubes made of KFRP/CFRP hybrid laminates subjected to quasi-static axial loads are investigated both experimentally and numerically. The full-diamond origami pattern and its variation forms with curved lobes are considered for the tube design. Five pre-folded tube specimens with different ply stacking sequences consisting of CFRP and KFRP woven fabrics are manufactured and tested in quasi-static axial compression tests. The f...
Abstract In this research, two novel folded lattice-core sandwich cylinders were designed, manufactured, and tested. The lattice core has periodic zigzag corrugations, whose ridges and valleys are directed axially or circumferentially. Free vibration and axial compression experiments were performed to reveal the fundamental frequency, free vibration modes, bearing capacity, and failure mode of the cylinder. A folded lattice core effectively restricts local buckling by reducing the dimension of t...
#1Wei Xingyu(HIT: Harbin Institute of Technology)H-Index: 1
#2Li Dafu(HIT: Harbin Institute of Technology)H-Index: 1
Last. Jian Xiong(HIT: Harbin Institute of Technology)H-Index: 28
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Abstract The tailor-folding method is proposed to make an all-composite sandwich panel with a carbon fiber reinforced polymer (CFRP) hexagon honeycomb core. Using this method, a CFRP honeycomb core with continuous fibers is fabricated automatically from a continuous plain woven prepreg to reinforce the constraints between adjacent cell walls. The analytical expressions were derived for predicting the stiffness and strength of the CFRP hexagon honeycomb sandwich panels for out-of-plane compressio...
#1Yang Lv(Tianjin Urban Construction Institute)H-Index: 7
#2Ying Zhang(Tianjin Urban Construction Institute)H-Index: 1
Last. X.M. Xiang(GU: Guangzhou University)H-Index: 9
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Abstract Miura-ori patterned sheets have been recognized as efficient energy absorption devices that can serve as the core of sandwich structures or a layer of metamaterials. In this paper, first, the geometric characteristics of a Miura-ori patterned sheet were examined. Second, a Miura-ori patterned sheet was fabricated using 0.3-mm thick aluminum sheets by three-step compression, and the patterned sheet was used as the core by bonding it between two aluminum skins to make a sandwich panel. Th...
#1Yuntong Du(HIT: Harbin Institute of Technology)H-Index: 2
#2Changping Song(HIT: Harbin Institute of Technology)H-Index: 1
Last. Linzhi Wu(HIT: Harbin Institute of Technology)H-Index: 41
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Abstract A carbon fiber-reinforced composite foldcore based on curved-crease origami was designed and fabricated using a hot press molding method. The fabrication process based on curved-crease origami reduces the abrupt change in fiber direction and is more suitable for continuous fiber-reinforced composites. The analytical models based on differential and integral method for predicting the compressive stiffness and strength of curved-crease origami foldcores were developed first and a three-di...
This paper investigates the compression properties and energy-absorbing characteristics of a carbon fiber-reinforced honeycomb structure manufactured using the vacuum-assisted resin transfer molding method (VARTM). The composite core materials were manufactured using a machined steel baseplate onto which hexagonal blocks were secured. A unidirectional carbon fiber fabric was inserted into the slots and the resulting mold was vacuum bagged and infused with a two-part epoxy resin. After curing, th...