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2D-SiC/SiC复合材料的弹丸冲击损伤及冲击后拉伸性能OA北大核心CSTPCD

Damage of 2D-SiC/SiC Composites under Projectile Impact and Tensile Properties after Impact

中文摘要英文摘要

连续纤维增韧陶瓷基复合材料以其良好的高温性能而被广泛应用在航空发动机等高温部件处,但服役过程中容易受到异物碎片冲击,这受到了广泛关注.研究采用轻气炮对化学气相渗透(CVI)技术制备的2D-SiC/SiC试样进行弹丸冲击,利用高速摄像机记录冲击过程,使用光学显微镜和CT观察异物损伤(FOD)的表面和内部结构,探讨了 2D-SiC/SiC复合材料的高速冲击损伤特性.结果表明,2D-SiC/SiC复合材料的高速冲击损伤形式包括锥形裂纹、层间分层、纤维断裂以及基体压溃等.通过表征损伤发现,试件背部损伤和边缘处分层损伤由反射拉伸波造成,随着冲击速度提升,弹丸与拉伸波共同作用会造成试件穿透,试件边缘分层损伤减弱.对高速冲击后的试件进行准静态拉伸试验,明确了剩余力学性能与冲击速度、弹丸直径的关系,表明剩余拉伸强度是表征冲击损伤程度的有效参数.同时,采用数字图像相关(DIC)方法获得拉伸过程中的应变分布,并结合不同弹丸直径、冲击速度冲击后的剩余拉伸强度,进一步对比探究不同变量对冲击损伤的影响.研究结果表明弹丸直径是高速冲击损伤程度的主要影响因素.

Continuous fiber-reinforced ceramic matrix composites are widely used for high temperature components like aerospace engines due to their superior performance at elevated temperature.However,these materials are susceptible to damage from foreign object debris during service,which has become a significant concern.To investigate the impact damage characteristics of 2D-SiC/SiC composites,this study utilized a light gas gun to subject specimens prepared using chemical vapor infiltration(CVI)technology to ballistic impact.The impact processes were recorded with a high-speed camera,while the surface and internal structures of foreign object damage(FOD)were examined by optical microscopy and computed tomography(CT).This investigation revealed that conical cracks,interlaminar delamination,fiber fracture,and matrix collapse were the primary manifestations of high-speed impact damage.Damage characterization indicated that backside damage and edge delamination damage were caused by reflected tensile waves.As the impact velocity increased,the combined action of the projectile and tensile waves resulted in specimen penetration and weakening of edge delamination damage.Quasi-static tensile tests on high-speed impact specimens elucidated the relationship between residual mechanical properties and impact velocity,as well as projectile diameter.The results showed that residual tensile strength was a crucial parameter indicative of the severity of impact damage.Additionally,digital image correlation(DIC)was employed to determine strain distribution during tensile processes.By integrating residual tensile strength after impact with different projectile diameters and impact velocities,the study further explored the effect of varied parameters on impact damage.The research findings highlighted that projectile diameter as the primary factor influencing the extent of high-speed impact damage.

李广宇;岳一凡;王波;张程煜;索涛;李玉龙

西北工业大学航空学院,西安 710072西北工业大学航空学院,西安 710072||陕西省冲击动力学及工程应用重点实验室,西安 710072||强度与结构完整性全国重点实验室,西安 710065西北工业大学材料学院,西安 710072陕西省冲击动力学及工程应用重点实验室,西安 710072||西北工业大学民航学院,西安 710072

化学工程

陶瓷基复合材料高速冲击异物损伤剩余拉伸强度数字图像相关技术

ceramic matrix compositehigh-speed impactforeign object damageresidual tensile strengthdigital image correlation technology

《无机材料学报》 2024 (005)

非均质材料高速雨滴冲击破坏机理研究

494-500 / 7

强度与结构完整性全国重点实验室自主研究课题(LSSIZZYJ202302);国家自然科学基金(11832015)Independent Research Project of the National Key Laboratory of Strength and Structural Integrity(LSSIZZYJ202302);National Natural Science Foundation of China(11832015)

10.15541/jim20230474

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