固化状态对粘接接头超声非线性参数的影响

Nondestructive Evaluation and Characterization of Engineering Materials for Reliability and Durability Predictions Pub Date : 2000-11-05 DOI:10.1115/imece2000-1649

Guoli Liu, J. Qu, L. Jacobs

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引用次数: 2

摘要

本文的目的是利用非线性超声技术表征聚合物粘接接头的固化状态。为此，对不同养护条件下的接头试样进行了透光性试验。在这些测试中，以2MHz窄带PZT换能器作为入射波产生40周谐波信号。通过粘接接头传输的波用4MHz窄带PZT换能器接收。测量了传输信号中二阶谐波的幅值，并计算了相应的非线性参数β。在非线性参数与固化状态之间观察到相当好的相关性。研究发现，欠养护(较低的养护温度或较短的养护时间)会使非线性参数增大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Effects of Cure State on the Ultrasonic Nonlinear Parameter in Adhesive Joints

The objective of this paper is to characterize the cure state of polymer adhesive joints using nonlinear ultrasonic techniques. To this end, through transmission tests were carried out on joint samples that had been subjected to various curing conditions. In these tests, a 40-cycle harmonic signal was generated by a 2MHz narrow-band PZT transducer as the incident wave. The wave transmitted through the adhesive joint was received with a 4MHz narrow-band PZT transducer. The magnitude of the second order harmonics in the transmitted signal was measured and the corresponding nonlinear parameter β was calculated. A fairly good correlation was observed between the nonlinear parameter and the cure state. It was found that under-curing (lower curing temperature or short curing time) tends to increase the nonlinear parameter.

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Nondestructive Evaluation and Characterization of Engineering Materials for Reliability and Durability Predictions

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