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Experimental study on flash radiation and damage characteristics of C/SiC composites induced by hypervelocity impact
International Journal of Impact Engineering ( IF 5.1 ) Pub Date : 2021-05-05 , DOI: 10.1016/j.ijimpeng.2021.103902
Han Yafei , Yuan Maoen , Tang Enling , Chen Chuang , Chang Mengzhou , Guo Kai , He Liping

Continuous carbon fiber-reinforced SiC-matrix composites(C/SiCs) have been developed for key thermal structures of aerospace and hypersonic vehicles, which is important to research on thermal and dynamic behavior of C/SiC composites under hypervelocity impact for understanding the response characteristics of C/SiC composites subjected to shock loading. The projectiles made of C/SiC composites and silicon carbide(SiC) were loaded by two-stage light gas gun to impact C/SiC plates with impact velocities from 1.35 km/s to 3.5 km/s and impact angle of 90°, the damage morphology of C/SiC plates, the evolutionary process of thermal radiation and impact pressure were obtained. The experimental results show that fiber failure of C/SiC composites consumes part of the initial kinetic energy during hypervelocity impact, therefore, the carbon fiber improves the fracture toughness of SiC matrix. Under the experimental conditions given in this paper, the lower impact velocity is, the greater differences of thermal and dynamic response between the two kinds of projectiles are. Compared with SiC projectiles, the C/SiC composite projectiles have longer flash radiant duration and lower flash radiant temperature. However, when the impact velocity is higher, the flash radiant duration and the flash radiant temperature of the two kinds of projectiles are similar due to the fiber fracture of the C/SiC composite, and the peak of flash radiant temperature appears before flash radiant intensity during impact process. For the damage characteristics of C/SiC plates, the higher impact velocity is, the smaller perforation diameter of C/SiC plates is, and the shape is more regular. With the decrease of the impact velocity, the damage morphology of C/SiC plates is irregular, and the matrix powdering is more serious.



中文翻译:

超高速冲击引起的C / SiC复合材料的闪光辐射和损伤特性的实验研究

连续碳纤维增强SiC基复合材料(C / SiCs)已被开发用于航空航天和高超音速飞行器的关键热结构,这对于研究C / SiC复合材料在超高速冲击下的热和动力行为对于理解响应特性具有重要意义。 C / SiC复合材料承受的冲击载荷。由C / SiC复合材料和碳化硅(SiC)制成的弹丸由两级轻气枪加载,以1.35 km / s至3.5 km / s的冲击速度和90°的冲击角冲击C / SiC板。获得了C / SiC板的损伤形态,热辐射和冲击压力的演化过程。实验结果表明,C / SiC复合材料的纤维断裂在超高速冲击过程中消耗了一部分初始动能,因此,碳纤维提高了SiC基体的断裂韧性。在本文给出的实验条件下,冲击速度越低,两种弹丸的热响应和动态响应的差异就越大。与SiC弹丸相比,C / SiC复合弹丸具有更长的闪光辐射持续时间和更低的闪光辐射温度。然而,当冲击速度较高时,由于C / SiC复合材料的纤维断裂,两种弹丸的闪光辐射持续时间和闪光辐射温度相似,并且闪光辐射温度的峰值出现在闪光辐射强度之前。在冲击过程中。对于C / SiC板的损伤特性,冲击速度越高,C / SiC板的穿孔直径越小,形状越规则。

更新日期:2021-05-15
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