Study On Limiting Device Based On New STG/UHMWPE Impact Resistant Material And Its Impact Resistance In Bridges

High-performance fiber materials have been widely used in the field of military and sports protective equipment.The materials prepared by combining shear thickening materials and high-performance fiber materials have excellent impact resistance.The impact resistance and vibration reduction device developed by composite fiber materials is suitable for large-scale civil engineering.In terms of engineering,to minimize external impact damage.Shear Thickening Gel(STG)has a good energy absorption effect and ability to resist deformation;Ultra-High Molecular Weigh Polyethylene(UHMWPE)as a new high-performance fiber with high strength and high Excellent mechanical properties such as modulus and low elongation at break,as well as impact resistance and chemical corrosion resistance.In this paper,STG and UHMWPE are combined to prepare new STG / UHMWPE impact resistant material.Due to the shear thickening effect of STG,new STG / UHMWPE impact resistant material has been greatly improved.Based on actual engineering problems,this paper develops a limiting device based on new STG / UHMWPE impact resistant material,which can resist external impact,and establishes a dynamic mechanical model suitable for the STG / UHMWPE impact resistant material.The main research contents of this paper include:(1)Research on dynamic impact mechanics model of new STG / UHMWPE impact resistant material.Through the analysis of new STG / UHMWPE impact resistant material,the impact energy consumption is divided into four parts:compression energy consumption in the impact zone,primary fiber tensile fracture energy consumption,secondary fiber deformation energy consumption,and STG energy consumption.Theoretical calculation model for impact resistance and energy consumption of the four parts of the new STG / UHMWPE impact resistant material.(2)Preparation and testing of STG and new STG / UHMWPE impact resistant material.Developed a good shear thickening rubber mix ratio and preparation method,tested the excellent dynamic mechanical properties;studied the influence of the dispersed phase and the dispersion medium on the dynamic mechanical properties of STG,and determined the comparison of STG Excellent mix ratio.Prepare new STG /UHMWPE impact resistant material,test the quasi-static material mechanical properties of UHMWPE and new STG / UHMWPE impact resistant material through quasi-static mechanical experiments,and measure the prepared new STG / UHMWPE impact resistant material the tensile modulus,in-plane shear modulus,tensile strength and in-plane shear strength of the positioning device.(3)Low-speed impact finite element analysis and low-speed impact test analysis of new STG / UHMWPE impact resistant material.According to actual engineering problems,determine the impact velocity of the impact object,and analyze the impact resistance and energy consumption capacity of new STG / UHMWPE impact resistant material when impact objects of different quality and different speed impact the new STG / UHMWPE impact resistant material.The ABAQUS software is used to analyze the impact resistance of the new STG / UHMWPE impact resistant material.The Hashin failure model was selected to simulate the impact of the new STG /UHMWPE impact resistant material.The new STG / UHMWPE impact resistant material was tested through two low-speed impact tests.The results show that the new STG / UHMWPE impact resistant material has better impact resistance and energy consumption performance.(4)Research on the limiting device based on new STG / UHMWPE impact resistant material.Combining the new STG / UHMWPE impact resistant material with the traditional bridge damper,a new type of bridge damper with limit effect is designed.The effectiveness of the bridge damper with limit function is verified by simulation calculation.