Study On Impact Resistance Of TSP Kirigami Folded Structure

The impact resistance and protective performance of sandwich structure and cladding structure with TSP(Truncated Pyramid Square)kirigami structure as core under local impact load are investigated in this study.First,quasi-static crushing test is used to compare the different fixing boundaries of TSP kirigami folded structure.Without affecting the crushing behavior of TSP kirigami folded structure,the boundary of economy,convenient processing and practical engineering application is determined.Numerical model of the TSP kirigami folded structure under quasi-static out-of-plane crushing test is constructed using the finite element analysis software LS-DYNA,and calibrated by comparing the results of quasi-static crushing experiments.The calibrated numerical model is used to study the dynamic response and failure mechanism of the TSP kirigami folded structure under dynamic crushing.The results show that in the speed range of 1m/s to 20m/s,the energy absorption performance and plateau stress of the kirigami folded structure exhibit better performance that are not sensitive to the loading rate.Compared with the same quality and the same core height of the aluminum foam,the TSP kirigami folded structure has a smaller maximum backplane displacement and residual displacement under different impact speeds when used as a sandwich structure,which means a stronger resistance to deformation.When used as a cladding structure,peak load transmitted to the cladding protected structure of the cladding with TSP kirigami folded structure during impact loading is smaller than that of the same quality and the same core height of the foamed aluminum structure when the impact velocity of 20m/s is applied.Finally,this paper analyzes the dynamic response of the TSP kirigami folded sandwich structure and cladding structure and the corresponding protection performance and energy absorption under different impactor parameters and impact positions.The study found that for the TSP kirigami folded sandwich structure,as the impact speed increases,the maximum displacement and residual displacement of the center of the structural backplane increase.And in the impact velocity range of 25m/s to35m/s,because the hemispherical impactor has a smaller contact area with the structure,the load is more concentrated,and the deformation of the structural backplane is greater than when the flat-headed impactor acts.For the TSP kirigami folded cladding structure,since the contact area of the flat-headed impactor is larger than that of the hemispherical impactor when it is impacted,the contact stiffness is greater when it acts on the structure and the contact duration is shorter.The transmission force of load cell at different positions is related to the compaction degree of the core layer of the cladding structure and the distance from the impact position to the sensor.The greater the degree of compaction of the core layer of the TSP folded core cladding structure and the closer the impact position to the sensor,the greater the transmission force is.