Design And Energy-Absorbing Mechanism Of The Spatial Self-Locking System With Clamping Slot

The buffer energy absorption device can be used in the field of emergency protection such as collision,impact and explosion,and plays a very important role.Therefore,the buffer structure with good energy absorption characteristics has great scientific significance and application prospects for ensuring the safety of personnel and equipment.In this paper,a space self-locking energy-absorbing system with clamping slot is proposed,which can realize rapid disassembly,space self-locking and editing.The self-locking characteristics and energy-absorbing mechanism of the energy-absorbing system under quasi-static and dynamic conditions are studied from two aspects of experimental research and numerical simulation.The main conclusions are as follows:(1)A new type of space self-locking energy absorption system is proposed and its working conditions are designed.Firstly,according to the principle of interpenetrating self-locking and the structural shape of the female hair band,a new self-locking energy absorption system based on the editing and assembly of the structural unit of the thin-walled circular tube with a slot is designed;Secondly,the mathematical model of the relationship between structural geometric parameters that can realize self-locking characteristics of structural elements is established;Then,two directional parameters are introduced,the working condition of impact load is designed,and the performance evaluation index and the complex proportional assessment(COPRAS)method are analyzed,which provides a theoretical basis for the analysis of the energy absorption characteristics of the selflocking system later.(2)Carry out finite element model verification and energy absorption characteristics research of the energy absorption system unit structure.Firstly,the material parameters of 45 steel are measured and the finite element model of the structural element is established;Secondly,the quasi-static compression test is carried out on the structural element,and it is found that the deformation mode of the structural element can be divided into the linear stage dominated by elastic deformation,the platform stage dominated by plastic deformation and the compaction stage with rapid load growth.The platform stage is the main stage of energy absorption of the structural element.The research results show that the results of simulation analysis and experimental research are highly consistent,and the relative error is controlled within 10%,which verifies the reliability of the finite element model.(3)Verify the self-locking characteristics of the energy absorption system under different working conditions,and reveal the energy absorption mechanism.First,verify the self-locking characteristics of the energy absorption system under different friction coefficients;Secondly,under the action of uniformly distributed/concentrated impact load in any direction,it is verified that the energy absorption system can achieve the characteristics of all-directional self-locking in space;Further,based on the quantitative analysis of the COPRAS method and the qualitative analysis of the radar chart,it is found that.Under the condition of diction 3 uniformly distributed/concentrated impact load,the energy absorption system has good comprehensive performance;Finally,the dynamic impact test and finite element simulation fit well.The results show that the compression process of the energy absorption system is divided into four stages: the shock wave propulsion stage,the energy conversion stage,the densification stage and the rebound stage.(4)Establish the optimal design criteria of the space self-locking system with slot.First,optimize the size parameters of the structural unit to improve the energy absorption capacity of the energy absorption system;Secondly,the influence of the number of layers and width on the energy absorption capacity is studied.It is found that the total energy absorption is linear with the number of layers,width and total number of layers;The design criteria of the system are put forward,which provides theoretical support for the practical application of the buffer energy absorption structure.