基于超声导波的贮箱绝热结构损伤检测技术研究

Research on damage detection technique of cryogenic tank adiabatic structure using ultrasonic guided waves

针对可重复使用运载器(RLV)中的低温贮箱绝热结构损伤与失效模式,结合绝热结构脱粘的无损检测技术,提出了一种基于超声导波(Lamb波)的绝热结构脱粘检测和监测技术方案。并在温度—载荷联合加载试验中对绝热结构(试片级)进行脱粘检测,通过原理性验证试验效验方案的可行性,为RLV低温贮箱绝热结构设计、性能考核和使用维护提供技术支持。

According to the damage and failure mode of the Reusable Launch Vehicle(RLV)cryogenic tank insulation structure,combined with the NDT technology of adiabatic structure debonding,a technical solution of insulating structure debonding detection and monitoring was proposed based on ultrasonic guided waves.Also the adiabatic structure debonding(specimen stage)was detected in the temperature-load combined loading test,while the feasibility of the system was preliminarily measured by principle verification test,which provided support to the design,performance assessment and maintenance of RLV cryogenic tank insulation structure.