Research On The Mechanical Properties Of Connection Mechanism And Biomimetic Honeycomb Structure Of The Diabolical Ironclad Beetle

During the long process of evolution in nature,the coleoptera of the diabolical ironclad beetle is connected in a jigsaw interlocking method,causing the beetle’s flight ability to gradually deteriorate.The exoskeleton of the beetle continuously hardens,and the overall structure has extremely strong pressure resistance,which can effectively resist external predators.The geometric features and interlocking effects at the elytra junction provide new ideas for the development of new connection methods and bionic applications.Based on the structural characteristics of the diabolical ironclad beetle,this paper studies the mechanical properties of the beetle through theoretical analysis,numerical simulation and experimental methods to study the mechanical properties of the beetle in terms of support structure,connection mode and biomimetic structure application.The main work is as follows:Based on the existing research of the diabolical ironclad beetle,the axial compression simulation and test of the internal support structure of the beetle were carried out,and the influence of the jigsaw connection method of elytra on the overall compressive performance of the beetle was deeply studied.According to the geometric characteristics of the jigsaw connection,a theoretical analysis model is established to predict the peak load in the drawing process and compared with the experimental and finite element simulation results,which verifies the correctness of the theoretical model.Through the combination of experiment and simulation,the influence of the number of jigsaw elements,connection angle and geometric size on the mechanical properties such as stiffness,strength and toughness of the jigsaw connection was studied.In the case of the same contact area,increasing the number of jigsaw elements leads to a change in the size of the elements,which affects the mechanical properties during the drawing process.In the case of the same jigsaw element size,the mechanical properties show a linear increase trend with the increase of the number of jigsaw elements,because the increase in the number increases the contact area.For different connection angles,within a certain angle range,the increase of the jigsaw connection angle leads to the deepening of the degree of interlocking,the jigsaw connection was not easy to separate,and the pulling strength of the model is correspondingly improved.The increase of elliptic axis ratio(a:b)improves the mechanical properties,and the best mechanical properties are achieved when the ratio is 2.2:1.Based on the above analysis,it can be seen that increasing the number of elements,connection angle and elliptical axis ratio(a:b)has positive significance for improving the mechanical properties of the jigsaw connection.Based on the traditional concave hexagonal honeycomb structure,combined with the geometric characteristics of the diabolical ironclad beetle jigsaw connection,the concave hexagonal honeycomb structure is redesigned,and a new bionic honeycomb cylindrical structure is proposed.Through the combination of experiment and simulation,the deformation mechanism,failure form,energy absorption and structural deformation resistance of bionic honeycomb cylindrical structure under axial compression are studied.The influence of different connection angles and geometric dimensions on the mechanical properties of bionic honeycomb cylindrical structure was deeply studied.For structures with different connection angles,the reason for the difference is the difference in the structural elements and the overall size.For structures with different elliptical axis ratios,the reason for the difference is that the change of the elliptical axis ratio leads to different curvatures on both sides of the structural element.Based on the bionic honeycomb structure unit of the diabolical ironclad beetle,the planar structure of the diabolical ironclad beetle bionic honeycomb was designed.Combined with the successful cases of finite element numerical simulation in structural shock,the finite element numerical simulation method is used to study low-speed impact.The deformation mechanism and energy absorption characteristics of the bionic honeycomb plane structure of the diabolical ironclad beetle under axial impact were analyzed.By changing the connection angle and elliptical axis ratio of the honeycomb structural elements,the deformation mode and energy absorption characteristics of the structure were further explored.