弹(箭)体级间连接结构准静载失效实验与数值预示

级间螺栓法兰连接是导弹(火箭)常见的连接方式,但破坏了整体结构连续性,且承载能力薄弱,在外荷载作用下易发生失效而使整弹(箭)结构强度丧失。根据实际导弹(火箭)连接结构特点,简化设计并制作了一组原理性实验件,设计了准静载加载实验测试系统和螺栓响应信号传感器,进行了两次准静载失效实验,并利用ABAQUS软件建立了对应的有限元仿真模型。根据实验效果和实测数据,分析了连接结构在准静载荷载作用下的失效机理,并对比验证发现有限元模型数值模拟效果和精度与实验吻合较好。研究结论可为弹(箭)体级间连接结构承载能力和失效实验设计提供参考。

Experimental and numerical prophetic study on the failure of the connection structure between stages of the missiles(rockets) under quasi-static load

The interstage bolted flange connection is a common connection mode of the missiles (rockets), but it destroys the continuity of the whole missiles (rockets) structure and is of weak load bearing capacity that the whole missiles (rockets) structure is liable to fail so as to lose the strength under external load. Based on the bolted flange connection structure between stages of the actual missiles (rockets), multiple experimental specimens were simplified and manufactured, the quasi-static loading experimental system and the special bolt force signal acquisition sensor were designed, two quasi-static failure experiments were carried out, and the finite element simulation model was established by ABAQUS simultaneously. According to the experimental results and the measured data, the failure mechanism of the connection structure under quasi-static load was analyzed, and the numerical simulation results and precision of the finite element simulation model were proved good. The results in this research can be used as a reference for the loading bearing capacity and experimental design of connection structure between stages of missiles (rockets) under quasi-static load.