中文摘要：

为了缩短弹射座椅穿盖时间,确保飞行员安全逃生,提出了微爆索（MDC）爆炸切割技术在航空弹射救生系统中应用。首先对由黑索今（RDX）、奥克托金（HMX）、六硝基芪（HNSII）3种不同类型炸药,铅、铝两种包覆材料制作的半圆形微爆索线型切割平板航空有机玻璃（PMMA）元件进行了实验研究,观察了有机玻璃的层裂现象,确定了最佳的微爆索炸药类型、包覆材料和装药量。然后利用实验确定的微爆索方案,采用三维动态非线性显式有限元程序LS-DYNA3D,对沿舱盖中央铺设的微爆索切割真实全尺寸飞机舱盖透明件进行了计算机模拟。在有限元分析中,选择ALE算法模拟高能炸药起爆后表现出来的流体特性,定义自动面对面接触类型实现炸药与PMMA流固耦合作用,使用连续损伤动力学材料模型模拟有机玻璃在爆炸冲击波作用下的损伤行为,并伴随有层裂现象。数值模拟得到了一定的装药量对应的舱盖切割深度,与实验实测得到的结果吻合得较好。因此,平板有机玻璃元件实验可用来指导舱盖透明件实验。

英文摘要：

To shorten the time of ejection seat through the canopy,and to ensure pilot to safely escape and survive,the application of cutting technique with miniature detonating cord（MDC） in aviation ejection escape system is proposed.Firstly,experimental study on the cutting aeronautical polymethyl methacrylate（PMMA） plate with a serial of semi-circle MDC,which are made of royal demolition explosive（RDX）,high melting explosive（HMX）,Hexanitrostilbene II（HNSII） and two different metal materials（Pb and Al）,is performed.Spalling phenomenon in the PMMA due to MDC cutting is observed.The best explosive type,covered material and charge quantity suitable for MDC are determined.Subsequently,According to experimental result from PMMA component test,the process of cutting the real full-size warcraft canopy is simulated using three-dimension dynamic nonlinear explicit code LS-DYNA3D,herein MDC is installed along the center of canopy.In FEA,ALE algorithm is used to model the flow properties of explosive after detonation.Automatic surface to surface contact type is selected to implement fluid structure interaction between explosive and PMMA.Damage behaviors of PMMA subjected to detonation shock are represented by using continuum damage dynamic constitutive model accompanying with the spalling property.Lastly,cutting depths corresponding to given charge quantities are obtained by numerical simulation,which well agree with the experimental results.As a consequence,experiment on the PMMA plate is able to guide canopy test.