Analysis Of Thermo-Mechanical Characteristics Of Fiber Fabric Hypervolicity Impact

A large amount of space debris exists in the spacecraft's orbit,which seriously threatens the safety of the spacecraft's orbit.It is necessary to add protective structures on the surface of the spacecraft.The fiber fabric has the characteristics of high strength,high modulus,excellent impact resistance,flexible folding,small folding volume,and large unfolding volume.It can be unfolded in space to form a multiscreen large-spacing protective structure.Therefore,in the protection of space debris,fiber fabrics have very good application prospects.During the hypervelocity impact(HVI)of space debris and spacecraft protective structure,due to the extremely high impact pressure of the impact area,the kinetic energy of the projectile is absorbed and a sharp temperature rise is generated,and the debris cloud will undergo a phase change due to the temperature increase,etc.The phenomenon leads to changes in the penetration ability of the debris cloud,which affects the protective performance of the protective structure.The study of thermo-mechanical characteristics during the ultra-high-speed collision is of great significance,and can provide a reference for the design of protective structures.In this paper,the research on thermo-mechanical characteristics of ultra-highspeed collision of fiber fabrics is carried out,which mainly includes the following work:1)Based on the structural characteristics of fiber fabrics,establish a simulation analysis model of its ultra-high-speed collision thermo-mechanical characteristics.Starting from the yarn weaving structure of the fiber fabric,a mesoscopic unit cell geometric model of the woven yarn is established,and a single-layer/multi-layer fiber woven cloth is established based on the unit cell.Secondly,the fiber fabric constitutive model,state equation and failure criterion are determined,combined with the FEM-SPH coupling method,the fiber fabric ultra-high-speed collision thermomechanical simulation analysis model is established and simulated.Then,the calculation results are compared with the experimental results in the literature,and the results are in good agreement,which verifies the correctness of the simulation model established in this paper.2)Using the simulation model established above,the effects of fiber modulus and melting point on the collision characteristics of fiber fabrics were analyzed.By comparing the thermo-mechanical characteristics of the ultra-high-speed impact of the fiber fabric shield,including temperature,stress,perforation diameter,projectile kinetic energy absorption rate and other thermo-mechanical characterization parameters,the influence law of the fiber modulus and melting point on the impact characteristics is obtained The results show that the stress and temperature in the collision area increase with the increase of melting point and modulus.High modulus fiber and high melting point fiber have better protection performance than low modulus and low melting point fiber.3)According to the structural characteristics of fiber fabrics,the impact of fabric thickness,fiber cross-sectional area and other structural parameters on its collision characteristics was analyzed,and the collision characteristics and protection performance of different thickness fabrics and projectiles with different collision angles were analyzed.The results show that the thinner fabric has higher protection efficiency;the projectile with larger collision angle has better protection effect;the smaller the fiber cross-sectional area,the better the protection performance.