该文介绍了一种基于空气耦合超声技术的材料杨氏模量评估方法。首先采用1-3型压电复合材料及双层匹配结构, 研制了高灵敏度的空气耦合超声换能器。在一发一收模式下, 该空气耦合超声换能器的插入损耗和-6 dB带宽分别为-23.9 dB和26.9%。其次搭建实验平台, 将空气耦合超声技术与静态拉伸法结合, 以评估铜线和银线杨氏模量。铜线和银线杨氏模量评估结果与对应的公认值范围一致。

This paper presents a method for evaluating Young’s modulus of materials based on air-coupled ultrasonic technology. Firstly, the air-coupled ultrasonic transducer is developed based on 1-3 piezoelectric composites and double-layer matching structure. In the mode of one-transmitter-one-receiver, the insertion loss and -6 dB bandwidth of the designed air-coupled ultrasonic transducer are -23.9 dB and 26.9%, respectively. Then, an experimental platform is set up to evaluate the Young’s modulus of copper wire and silver wire by combining the static tensile method and air-coupled ultrasonic technology. The evaluated results are consistent with the corresponding recognized values.