透明陶瓷冲击损伤的微细观机理研究

Exploring the shock fracture mechanism of transparent ceramics is important to the enhancement of shock resistibility of bulletproof window, missile fairing, and anti fall mobile phone screen, which using the transparent ceramics as key material. It would also promote the potential application of transparent ceramics in the experimental measurement of shock wave. In this work, shock wave experiments, X-ray imaging and numerical simulations of shock fracture will be combined to investigate the YAG transparent ceramics. On the macroscopic response investigation, we will measure the shock wave profiles, obtain the influence of shock stress and microstructures (monocrystal or polycrystal, size of the gains, and porosity, etc.) on the propagation of shock waves. On the mesoscopic investigation, we will design a soft-recovery experimental device to recover the shocked transparent ceramics, and probe the internal damage distributions of the recovered samples using X-ray imaging. The X-ray can be generated by high power pulse technology. On the numerical simulations of shock fracture, we will reveal the evolution of grain boundaries, voids and cracks in the shocked transparent ceramics, analyze the grain boundaries’ effect to hinder the extension of cracks, establish the correlation between mesoscopic damage evolution and macroscopic shock response, and explore the mechanism of inhibition or delay of the damage evolution in the shocked transparent ceramics by microstructure designing.

透明陶瓷在防弹窗口、导弹整流罩、手机防摔屏等应用中具有越来越重要的实用价值，其抵抗冲击损伤的微细观机理是急需深入研究的前沿科学问题。本项目拟采用先进X射线光源对受冲击透明陶瓷的微细观损伤状态进行成像分析，揭示不同的冲击应力和微结构状态（单晶和多晶样品、晶粒尺寸和气孔率不同等）对于冲击损伤演化的影响；并且建立冲击波压缩下透明陶瓷损伤演化的计算模型，开展透明陶瓷内部晶界、气孔、裂纹等微结构演化过程的数值模拟，分析晶界对于裂纹扩展的阻碍作用，建立细观损伤演化与宏观冲击响应之间的关联。通过将冲击波实验、X射线成像分析和数值模拟研究相结合，深入认识透明陶瓷冲击损伤的微细观机理，为制备具有良好抗冲击能力的新型透明陶瓷提供物理认识。

透明陶瓷已作为防弹窗口、导弹整流罩、手机防摔屏等得到了广泛应用，其在爆炸与冲击作用下的破坏机理与抗损伤设计是当前研究的前沿问题。本项目针对透明陶瓷的单晶、微米多晶、纳米多晶等多种透明陶瓷样品，通过冲击宏观响应测量、冲击软回收样品损伤分析、宏细观冲击演化数值模拟研究，在实验研究中完成了冲击波剖面测量，分析认识了冲击应力、晶粒尺寸、气孔率等因素对于透明陶瓷力学响应与光学特性的影响，认识了冲击压缩下细观的损伤特征，理解了气孔、裂纹、晶界等微结构的演化行为，建立了细观损伤与宏观响应之间的对应关联，深入揭示了透明陶瓷冲击损伤的细观机理，为制备具有良好抗冲击能力的新型透明陶瓷提供了物理认识。