Bionic design in anti-bending and lightweight tube based on the tarsometatarsus of ostrich

Development of a Bionic Tube with High Bending-Stiffness Properties Based on Human Tibiofibular Shapes

“…During image processing, the tibiofibular bone segment with a total length of 270 mm was determined (the bone-segment sample was selected from the middle of the CT image), and eight positions, at 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% of the total length were selected [ 1 ]. Therefore, the images at sections 54.19 mm, 81.02 mm, 108.24 mm, 135.07 mm, 162.04 mm, 189.00 mm, 215.97 mm, and 243.06 mm were analyzed ( Figure 2 a,b).…”

“…Each cross-section had four straight lines of different lengths. The tibia and fibula were separately sorted using statistics analysis of these line distances ( Figure 3 a,b) [ 1 ]. The type 1 bionic tube with variable elliptical cross-sections was directly referenced to the sample data of different sections obtained from the above list.…”

“…Binding constraints fixed by six degrees of freedom were applied at the proximal end of each tube (the variable cross-section fitting was on the larger hole-area side), and coupling constraints were applied at the distal end of the opposite side (coupling the distal cross-sections to the reference point). A concentrated force of 50 N was uniformly applied on the reference point at the distal end [ 1 , 37 ], pointing in the positive direction of the datum axis Z and perpendicular to the length direction of the tubes. In this study, we tested 12 different loading orientations (0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, 330°) and took the one with weakest bending property to depict.…”

“…This kind of bionic optimization of structures has great practical significance in engineering, etc. [ 1 ].…”

“…Therefore, it is now possible to copy some of the complex optimal shapes found in nature and to apply them to everyday engineering components. Zhang et al [ 1 ] designed a bionic tube-fitting based on the leg bone of an ostrich, and compared it with three other tube-fitting designs. Alper et al [ 11 , 12 , 13 , 14 , 15 ] investigated the load-carrying and energy-absorbing properties of thin-walled structures inspired by Balanus.…”