基于瞬态动力学的复合材料密封盖可靠性分析

Reliability analysis of composite seal cover based on transient dynamics

为探讨复合材料定向断裂密封盖的可靠性,建立了密封盖材料的等效强度模型、失效准则及三维有限元计算模型.分析了在引信反向冲击下密封盖断裂破坏过程中引信冲击应力、密封层应变能随密封层厚度变化的规律,在火箭弹燃气射流正向冲击下密封盖自锁可靠性随支撑层厚度变化规律.结果表明:拓扑自锁密封盖要满足定向断裂要求,保证引信体的安全性和可靠性,其密封层厚度越小越好;在燃气射流的冲击下,随着支撑层厚度的减小,会显著增大密封盖支撑层子结构间最大接触应力,降低拓扑自锁的可靠性.

In order to explore the directional fracture reliability of a composite seal cover, the models of equivalent strength, failure criteria and the 3D finite element were established. The laws of fuze impact stress during the process of fracture damage under fuze backward impact force, changes of seal layer strain energy with seal layer thickness, and the reliability of seal cow er due to the interlocking function under the adjacent fired-gas streams positive impact with support layer thickness variation were analyzed. The results show that： 1）To meet the requirements of topological self-locking closures fracture orientation, ensure the security and reliability of fuze body, the smaller the seal layer thickness, the better; 2）At the impact of fired-gas streams, with the support layer thickness decreasing, sub-structure support layer closures largest contact stress will be greatly increased and the reliability of self-locking topology may be lowered.