Research On Impact Mechanical Performance Of Topological Interlocking Structure With Different Element Shape

Topological interlocking structure is an innovative structural design concept which occurs in recent years.The structure is formed by a certain number of discrete elements which bound to each other,imposing certain constraints around it to enable it to resists load.Compared to monolithic assembly,the toughness of topological interlocking structure is significantly enhanced.It also has good cushioning energy absorption performance,resistance to local damage,inhibit crack extension and other advantages.Over the years,many domestic and international researchers have studied the performance and application of topological interlocking structures,which can be applied to various fields as design concepts,functional materials,and interface enhancement strategies.At present,the research on the quasi-static mechanical properties of topologically interlocking structures is relatively sufficient.This paper focuses on exploring the dynamic mechanical properties of topologically interlocking structures,combining finite element simulation and experiments to analyze the structural response and its energy absorption mechanism under dynamic loads,its feasibility as an impact protection structure and the idea of structure optimization is considered.The research includes following points:1.The topological interlocking elements of curved contours is designed,further improve the elements based on this with reference to mortise-tenon structure and bionic structure,making the solid model by 3D printing.2.Conducting standard specimen tensile experiments to determine the basic mechanical parameters of PLA plastic required in the simulation.ABAQUS is used for the analysis of topological interlocking and monolithic assembly,using PLA and steel materials respectively,obtaining the response results and force-displacement curves under different impact velocities.Finally analyzing the mechanical characteristics of the topological interlocking structure.3.To investigate the influence of interlocking angle,friction coefficient,element shape and other factors on the mechanical properties of topological interlocking structure through simulation,and summarize the various laws and special properties of topological interlocking structure.Above factors influence mechanical properties of the structure can be roughly divided into two categories.The first category is the improvement of stiffness,which corresponds to the enhancement of shock resistance and the increase of peak load.The second is the improvement of toughness,which corresponds to the improvement of buffering performance and the increase of structural displacement.Therefore,topology interlocking elements should be designed according to functional requirements to achieve better results.4.According to the topological interlocking structure model and the actual situation of the experimental equipment,the experimental fixture is designed and maked,and then conduct comparative experiments of the topology interlocking structure and the monolithic assembly,as well as the experimental exploration of the rigid-flexible composite topological interlocking structure.Next,observeing the experimental phenomenon and analyzing the experimental data.The research shows that the local mortise and tenon joint and the rigid-flexible combination can optimize the mechanical properties of the original topological interlocking structure.