Core panels made of origami structures provide effective force redistribution and energy dissipation. A wide range of origami patterns is proposed to create three-dimensional panels, which can be used as sandwich cores. The origami tessellation mainly consists of unit cells made of small faces joined together through crease lines. Ron-Resch is an origami pattern composed of star pleats joined together that exhibits pronounced shape flexibility and geometry forming as well as potential mechanical performance. These advantages can be employed for load dissipation and damping due to its high deformation and strain values. This study focuses on three different Ron-Resch-like origami tessellations based on the star pleat’s number of branches and the area of internal facets of the star pleat. An additive manufacturing technique was used to fabricate the tested samples from polylactic acid filament. In addition, compression and impact tests were conducted to evaluate the effect of the folding angle for three different angles and then the results have been discussed. The ANSYS finite element package was used to numerically simulate the compression and impact events Moreover; the study includes investigation of the shape memory effect based on the shape recovery of the unit element of the Ron-Resch-like origami tessellation.
Kshad, M. A. E., & Naguib, H. E. (2016). Development and modeling of multi-phase polymeric origami inspired architecture by using premolded geometrical features. Smart Materials and Structures, 26(2), 025012.
Core panels used for compression or impact damping are designed to dissipate energy and to reduce the transferred force and energy. They are designed to have high strain and deformation with low density. The geometrical configuration of such cores plays a significant role in redistributing the applied forces to dampen the compression and impact energy. Origami structures are renowned for affording large macroscopic deformation which can be employed for force redistribution and energy damping. The material selection for the fabrication of origami structures affects the core capacity to withstand compression and impact loads. Polymers are characterized by their high compression and impact resistance; the drawback of polymers is the low stiffness and elastic moduli compared with metallic materials. This work is focused on the study of the effect of Carbon Nano Fibers (CNF) on the global mechanical properties of the origami panel cores made of polymeric blends. The base matrix materials used were Polylactic Acid (PLA) and Thermoplastic Polyurethane (TPU) blends, and the percentages of the PLA/TPU were 100/0, 20/80, 65/35, 50/50, 20/80, and 0/100 as a percentage of weight. The weight percentages of CNF added to the polymeric blends were 1%, 3%, and 5%. This paper deals with the fabrication process of the polymeric reinforced blends and the origami cores, in order to predict the best fabrication conditions. The dynamic scanning calorimetry and the dynamic mechanical analyzer were used to test the reinforced blended base material for thermomechanical and viscoelastic properties. The origami core samples were fabricated using per-molded geometrical features and then tested for compression and impact properties. The results of the study were compared with previous published results which showed that there is considerable enhancement in the mechanical properties of the origami cores compared with the pure blended polymeric origami cores. The active properties of the origami unit cell made of composite polymers containing a low percentage of CNF were also investigated in this study, in which the shape memory effect test conducted on the origami unit cell.
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