采用扩展有限元法的线式爆炸分离装置裂纹扩展分析

为了提高线式爆炸分离装置的安全性，本研究基于扩展有限元法，通过创建二维和三维动态裂纹扩展模型，探索了线式爆炸分离装置在爆轰波作用过程中的动态裂纹扩展和止裂机理。研究表明，分离壳体的裂纹扩展路径独立于裂纹初始角度；不考虑载荷时序时，二维和三维动态裂纹扩展的主方向分别沿着分离壳体的径向和环向；考虑载荷时序时，受不同区域应力波的联合作用，三维裂纹沿环向扩展的同时会沿着轴向扩展，但裂纹的扩展均不会影响到止裂槽以外的结构。所提方法和相应结论可为线式爆炸分离装置设计提供参考。
In order to improve the safety of linear explosive separation system, the dynamic crack propagation and crack arrest mechanism during the detonation wave propagation of linear explosive separation device were investigated on the basis of the extended finite element method and by creating 2D and 3D models. The results show that the crack propagation path is independent of the initial angle of preset crack. Without considering the loading sequence, the main directions of crack propagation are radial direction and circumferential direction for 2D and 3D models respectively. Once the loading sequence is taken into account, due to the combined effect of the stress wave from different regions, the 3D crack propagates circumferentially and axially but it does not influence the region outside the crack arrest slot either. The method used and results obtained in the study can provide a solution for the design of explosive separation devices.