复合材料蜂窝夹芯缺陷超声检测模拟研究

Ultrasonic Testing Simulation Research of Honeycomb Core Defects in Composite Sandwich Structure

实际检测中发现,复合材料蜂窝夹层结构中的芯格塌陷和胞壁鼓泡缺陷能够引起喷水超声穿透法C扫描检测中超声大幅度衰减。为了从理论上分析并验证蜂窝夹芯缺陷对穿透法超声传播的影响,本文采用3D有限元建模仿真方法,分别模拟了超声波在蜂窝壁完好、芯格塌陷、胞壁鼓泡这3种模型中的传播方式,研究了不同缺陷种类的尺寸和数量对、超声透射波幅值的影响,讨论了复合材料蜂窝芯格塌陷和胞壁鼓泡缺陷引起零件检测中超声波大幅度衰减的原因,与实际超声C扫描检测结果具有较好的一致性。

A large ultrasonic attenuation is found in water-squirting through-transmission ultrasonic C-scan detection of composite aramid paper honeycomb sandwich structure,which is caused by the defects of honeycomb collapse and cell bubbling.3D finite element modeling simulation method is used to analyze and verify the influence of the honeycomb sandwich defects on the ultrasonic propagation in penetrating method.The propagation modes of ultrasonic wave in the integrity honeycomb,honeycomb with collapse and cell bubbling defects are simulated.The influences of the size and number of different defects on the amplitude of ultrasonic transmission wave are analyzed.The causes of the ultrasonic wave attenuation are discussed.The results of finite element simulation are consistent with those of the ultrasonic C scan test.