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置于层状平面结构表面的斜劈超声换能器被用于激发和接收多模兰姆波。文章首先分析了采用多模兰姆波的幅频特性定征界面粘接强度的可行性。基于Ritec-SNAP 超声测量系统,建立了采用兰姆波方法定征层状结构界面粘接强度的实验系统。对于给定的层状平面结构,将粘接层的固化过程用于模拟粘接层界面强度的变化过程。对于不同的粘接层固化时间,实验测得的多模兰姆波幅频曲线明显不同。借助于声——超声技术中的应力波因子,给出了兰姆波应力波因子的定义。实验结果显示,兰姆波应力波因子与间接表示界面粘接强度的固化时间之间存在确定的单调对应关系,表明将多模兰姆波的应力波因子用于定征层状平面结构的界面粘接强度是可行的。
A wedge ultrasonic transducer placed on the surface of a layered planar structure is used to excite and receive multimode Lamb waves. The article first analyzes the feasibility of using the amplitude-frequency characteristic of multimode Lamb wave to characterize interface bonding strength. Based on the Ritec-SNAP ultrasonic measurement system, an experimental system for the determination of the bonding strength of layered structures by Lamb wave method was established. For a given layered planar structure, the curing process of the adhesive layer is used to simulate the change in the interface strength of the adhesive layer. For different bonding layer curing time, experimentally measured multimode Lamb wave amplitude frequency curve is obviously different. The definition of the stress factor of Lamb wave is given by means of the stress wave factor in acoustic-ultrasonic technology. The experimental results show that there is a definite monotonic relationship between the stress factor of Lamb wave and the curing time indirectly representing the bond strength of the interface, indicating that the stress wave factor of multimode Lamb wave is used to identify the interface of the layered planar structure Adhesive strength is feasible.