Ultrasonic reflection characteristics of FRP-to-FRP bonded joints with thick adhesive layers for bonding evaluation: Theoretical analysis
Ultrasonic reflection characteristics of FRP-to-FRP bonded joints with thick adhesive layers for bonding evaluation: Theoretical analysis
复制标题
用于粘合评估的厚粘合层 FRP 与 FRP 粘合接头的超声波反射特性：理论分析
DOI：
10.1016/j.compstruct.2020.112402
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发表时间：
2020
影响因子：
6.3
通讯作者：
Wu Bin
中科院分区：
文献类型：
--
作者：
He Cunfu;Li Yongkun;Lyu Yan;Song Guorong;Wu Bin
针对具有厚胶层的FRP-FRP（FiberReinforcedPolymer）胶接接头，进行了超声反射特性评价胶接性能的理论分析。得到了反射系数随频率和入射角变化的频谱，并进行了理论计算和有限元仿真验证。同时，为了研究界面退化对反射特性的影响，研究了单/双粘结界面的界面刚度变化。研究发现，随着界面刚度的减小，频谱中的局部极值点有向低频侧移动的趋势。但在角谱中，局部极值点会随着界面刚度的减小而向大角度侧移动。结果还表明，在两个频谱中的局部极小值密切相关的粘接接头的对称性，这是连接的被粘层的厚度，材料的性能，和双胶粘剂-胶粘剂界面的结合状态。
Theoretical analysis for bonding evaluation by ultrasonic reflection characteristics is carried out with respect to FRP-to-FRP (Fiber Reinforced Polymer) bonded joints with thick adhesive layers. Spectrums of reflection coefficients depending on frequencies and incident angles are obtained, which are calculated theoretically and validated by finite element simulation. Meanwhile, in order to study the effect of interface degradation on reflection characteristics, variations of interfacial stiffness for single/dual bonding interfaces are investigated. It’s found that local extreme value points in frequency spectrums intend to shift to the lower frequency side with the decrease of interfacial stiffness. However, in angular spectrums, local extreme value points will shift to the larger angle side with the decrease of interfacial stiffness. The results also show that the local minima in both spectrums are closely related to the symmetry of the bonded joints, which is connected with the thicknesses of adherend layers, material properties, and the bonding states of dual adherend-adhesive interfaces.