基于埋入式应变片的纤维缠绕压力容器的健康监测

Structural Health Monitoring of Filament Wound Pressure Vessel by Embedded Strain Gauges

在玻璃纤维缠绕金属内胆复合材料压力容器的制备过程中,将应变传感器埋在金属内胆与玻璃纤维/环氧树脂复合材料层之间,得到了具有原位监测功能的纤维缠绕压力容器。对该纤维缠绕压力容器开展水压疲劳和爆破实验。疲劳压力的最大值和最小值分别为 25 MPa 和2 MPa,最大疲劳周次为 5700;打压爆破压力为零到爆破压力,打压速率为 2 MPa/s。实验过程中,利用埋入式应变传感器原位监测了压力容器的应变变化,建立了不同载荷作用下纤维缠绕压力容器的应变与受载情况之间的关联。结果表明:采用埋入式应变传感器监测纤维缠绕压力容器的健康状况具有可行性;该方法在保护应变传感器不受外载荷破坏的前提下,原位监测了压力容器在疲劳和爆破实验中的应变变化趋势。

During the manufacturing process of a filament wound pressure vessel, we embed the strain gauges between the metal tank and glass fiber reinforced epoxy composite layer to obtain the capability of in-situ monitoring . Experiments with a full-scale composite pressure vessel during hydraulic fatigue cycling and pressurization are performed. The maximum and minimum pressures in the fatigue test are set as 25 and 2 MPa, and the maximum cycle number is set as 5700 cycles, respectively. The pressurization speed is set as 2 MPa/s from 0 MPa to busting pressure. The strain of the pressure vessel in the two loading tests is monitored by the embedded strain gauge. The relationship between the stain and the loading conditions of the pressure vessel was thus built. Results show that, by embedding the strain gauges during the processing, it is possible to monitor the health status of the vessel under hydraulic fatigue cycling and pressurization load without hurting the sensors by the external load.