The ingested particles or debris will cause high-speed & low-energy impact to the hot end components of aeroengine. Few literature focus on the projectile impact of SiC/SiC with Environmental Barrier Coating(EBC). The impact of 2 mm projectile was specially studied for Si/Yb2Si2O7/Yb2SiO5-SiC/SiC. Gas gun system was used to conduct impact testing at the speed of 3 m/s∼353m/s. The optical microscope, Scanning Electronic Microscope(SEM), micro CT were used to observe the impact and tension after impact(TAI) damage. For TAI, Digital Image Correlation (DIC) was used to conduct the full-field strain detection around the impact point. Meanwhile, the Smoothed Particle Hydrodynamics (SPH) methodology was programmed in C++ and developed to simulate SiC/SiC impact problem by introducing modified Hashin-Rotem criteria, extending interface method to 3D and adding GPU accelerated algorithm. The results indicate that threshold velocities of EBC huge peeling and SiC/SiC penetration are different, TAI residual strength also has extinct threshold at the velocity of 246 m/s with 37.1% declining extent, and the impact pit depth of SPH simulation is in good agreement with the experiment.

中文翻译：

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EBC-SiC/SiC弹丸冲击损伤实验与数值研究

摄入的颗粒或碎片会对航空发动机的热端部件造成高速、低能量的冲击。很少有文献关注带有环境屏障涂层（EBC）的 SiC/SiC 的射弹影响。针对Si/Yb专门研究了2毫米弹丸的冲击2硅2氧7/镱2二氧化硅5-碳化硅/碳化硅。采用气枪系统进行冲击试验，速度为3 m/s～353m/s。采用光学显微镜、扫描电子显微镜(SEM)、显微CT观察冲击及冲击后拉力(TAI)损伤。对于 TAI，使用数字图像相关 (DIC) 对冲击点周围进行全场应变检测。同时，采用C++编程并开发了平滑粒子流体动力学（SPH）方法，通过引入修改的Hashin-Rotem准则、将接口方法扩展到3D并添加GPU加速算法来模拟SiC/SiC冲击问题。结果表明，EBC巨大剥落和SiC/SiC侵彻的阈值速度不同，TAI残余强度在246 m/s速度处也有消失阈值，下降幅度为37.1%，SPH模拟的冲击坑深度良好。与实验一致。