Morphological Design And Test Of An Elastic Deployable Adaptive Structure

Excessive blood loss in local wars and anti-terrorism operations is still the main cause of deaths of soldiers.First aid on the battlefield must be done in time for quick hemostasis of light weapons penetrating injuries.The shape of bullet penetrating injuries is complicated and arbitrary.Based on this,this paper introduces a new type of hemostatic device for penetrating injuries with an elastic deployable adaptive structure as the core structure.The device utilizes the folding and unfolding of the elastic plate(blade)of the deployable structure to realize the storage and release of elastic potential energy,thereby filling the wounded tract and providing support for the inner wall of the wounded tract,so as to realize the rapid hemostasis of the penetrating injury.This paper mainly focuses on the four aspects of the blade shape design of the elastic deployment adaptive structure,the overall design and analysis of the deployment structure,the tooling design and test of the hemostatic device,and the performance test of the hemostatic device.Aiming at the blade shape of the elastically deployable adaptive structure,the morphological design method of the blade of the deployable structure was proposed based on the reverse design theory analysis of the force on the blade under ideal state.The blade topology of ‘straight line connection segment + curve contact segment’ was defineded.Morphological design optimization process was constructed.Based on this,the morphology optimization of the blades of the arc configuration,the Euler spiral configuration and the reverse design configuration was carried out,and the relationship and rule between the working performance and the morphological parameters of the blades of each configuration were obtained,as well as the optimal configuration parameters of the blade.The optimization results show that the optimal solutions after optimization of different configurations converge to similar shapes,and the performance of the reverse-designed configuration blades is relatively optimal.The overall design of the elastic deployable adaptive structure was carried out,and the optimal overall design parameters of the deployable structure are obtained.Based on this,the finite element simulation analysis of folding and unfolding is carried out on the optimized overall model,and the optimized adaptive structure works well.The fitting relationship between the overall structural support torque and the total contact support force provided to the injured track was obtained and verified,which provides a method and basis for the quantitative evaluation of the performance of the deployable structure in practical applications.Taking the hemostatic device as the research object,the folding plan of the hemostatic material and the folding tooling plan were discussed.Based on the results of the finite element analysis,a tooling scheme for deployable structure with vertical rod assisted winding is proposed;a folding scheme for hemostatic materials with 16 creases is determined;a scheme for folding hemostatic materials with auxiliary folding of the inner and outer rings is proposed.At the same time,the test tooling used for program verification was designed and processed,and the auxiliary assembly of the hemostatic device was completed using the tooling,which verified the feasibility of the tooling scheme.Finally,the tooling structure was optimized in detail and function based on the results of experiments and finite element analysis.In order to verify the hemostatic effect of the new type of rapid hemostatic device for penetrating injuries,a performance test of the hemostatic device was carried out.The test results reached expectations,verifying the performance of the new type of rapid hemostatic device for penetrating injuries.