Study On Hypervelocity Impact Properties Of Fiber Braided Material

There are a lot of space debris in the space environment.These debris have the characteristics of high speed and large destructive power,for larger fragments,capture and spacecraft active evasion,etc.can be used,but passive protection measures can only be used for fragments smaller than 1cm in diameter.Currently,a variety of new protective structures have been developed on the basis of traditional Whipple metal protective structures,the successful application of a new type of flexible braided multi-impact protection structure represented by Kevlar and Nextel on a spacecraft,However,at present,there are few studies on the ultra-high-velocity impact of woven materials in China.In this paper,the ultrahigh-speed impact properties of aramid and basalt fiber woven materials are studied,and the current damage characterization methods are improved.The main research contents are as follows:First,select plain weave basalt cloth and basalt unidirectional cloth for multiple layers,unidirectional cloth is laid in one direction and orthogonally,and multiple impact ultra-high speed impact tests are performed respectively,studying the influence of weaving,fiber direction on the impact properties of materials at high speed,the results show that the failure of one-way unidirectional laying is the most serious,and that of plain woven and unidirectional fabrics is quite similar.Secondly,satin-weaved basalt material was selected for the impact test,and compared with the plain weave experiment,the effect of different weaving methods on the impact properties of the material at high speed was studied,experiments show that satin weave material has more severe forms of damage than plain weave,furthermore,in order to study the effect of different materials on the hypervelocity impact characteristics of structures under the same conditions,the plain woven aramid fiber cloth was selected for the impact test and compared with the plain basalt experiment,the results show that the damage of basalt fiber material is more serious than that of aramid fiber,but the damage patterns are very different,the damage area of aramid fiber is relatively close to each screen,and the basalt damage from the second screen is larger,further,the same woven aramid and basalt materials are selected as materials for multiple impact protection structures,In accordance with the four-screen arrangement of ‘ Aramid/Aramid/Basalt/Basal ' and 'Basalt/Bas/Aramid/Aramid',the influence of the sequence of different materials on the impact characteristics of multiple impact protection structures was studied,The experimental results show that the damage caused by the arrangement of ‘aramid/aramid/basalt/basalt'is more severe than that of 'basalt/basalt/aramid/aramid'.In addition,the SPH simulation model of the braid was established and the correctness of the model was verified by the experimental results,in addition,the experimental conditions can only be limited by the use of a single-size projectile and a single incidence velocity,numerical simulation of different size shots and different impact speeds,the results show that with the increase of the incident speed of the projectile,the crushing effect of the shield on the projectile gradually increases,in the first screen,the kinetic energy absorption rate drops first and then rises.As the size of the projectile increases,the crushing effect of the protective structure on the projectile weakens.By comparing the residual kinetic energy of the projectile,it can be seen that as the size of the projectile increases,the kinetic energy absorption effect of the shield on the projectile decreases.