【作者】 杨扬； 徐绯； 张岳青；

【Author】 Yang Yang~(1,2),Xu Fei~1 Zhang Yue-qing~1 (1 School of Aeronautics,Northwestern Polytechnical University,Xi’an,Shaanxi,China 2 State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing China)

【机构】 西北工业大学航空学院结构工程系； 北京理工大学爆炸科学与技术国家重点实验室；

【摘要】 在服役过程中,航天飞机的热防护系统将不可避免的遭受空间碎片的撞击。平稳编织C/SiC复合材料(2D-C/SiC)作为一种典型的陶瓷基复合材料,已经在热防护领域得到了广泛的应用。首先,对2D-C/SiC材料和LY12硬铝在冲击速度3400 m/s～9300m/s范围内超高速冲击实验进行了回顾。其次,选取Autodyn软件的复合材料模型,基于2D-C/SiC材料已有的实验数据推导相关材料参数。进而,建立二维数值模型选取SPH求解器,对可视实验结果和自由面速度观测结果进行数值模拟,验证2D-C/SiC材料参数的合理性。最后,对不同冲击速度下,2D-C/SiC的碎片云结构以及飞片直径、靶材厚度对自由面速度的影响进行了数值分析。更多还原

【Abstract】 The thermal protection structure of the spacecraft in service will inevitably suffer the hypervelocity impact by the space debris.2D plain-woven C/SiC composite is a typical ceramic-matrix material,which has been widely applied in the thermal protection field.In this paper,firstly,the experiments that the Mylar flyers impact to 2D-C/SiC composite and LY12 hard aluminium under the velocity of 3400 m/s～9300m/s are investigated by using the electric gun.Secondly,an orthotropic constitutive material model is chosen to describe the hypervelocity impact response of 2D-C/SiC composite, and then by using the commercial software Autodyn,corresponding numerical simulation are carried out based on Smooth Particle Hydrodynamics method.The calculation results well agree with the experimental data.Finally,the relationships of free surface velocity to the diameter of the flyer and the thickness of the plate are discussed respectively.Some conclusions are given,which are very useful for the thermal protection structure design.更多还原