| 沙正骁,曾甘露,梁菁,陆铭慧,何方成,陆传雨.应用混频超声检测微小缺陷[J].,2022,41(6):956-963 |
| 应用混频超声检测微小缺陷 |
| Detection of micro defects by mixing ultrasound |
| 投稿时间：2021-09-15 修订日期：2022-05-21 |
| 中文摘要: |
| 高端飞行器的可靠性往往受限于其发动机内部盘、板等构的结构强度和使用寿命，因此对这类部件的无损检测在制造业上具有巨大需求。超声检测作为一种应用广泛、高效、环保的检测方法，常常被应用于这类构件的检测中。但是，大厚度盘、板类构件内的微小缺陷反射能力弱，常规超声脉冲反射法无法进行有效检测。为实现大厚度盘、板类构件内部微小缺陷的识别和定位，采用共线异侧纵波混频法，通过和差频信号特征识别微小缺陷；研究缺陷埋深变化对混频效果的影响，通过测量和差频信号幅值变化，实现微小缺陷的深度定位。结果表明：该方法可有效识别7075铝合金中埋深80mm的φ0.2mm横孔微缺陷，且可实现微小缺陷的深度定位。 |
| 英文摘要: |
| The reliability of high-end aircraft is often limited by the structural strength and service life of its engine internal disks and plates. Therefore, there is a huge demand for nondestructive testing of such components in the manufacturing industry. As a widely used, efficient and environment-friendly testing method, ultrasonic testing is often used in the testing of this kind of components. However, the reflection ability of micro defects in large thickness disks and plates is weak, and the conventional ultrasonic pulse reflection method can not detect them effectively. In order to realize the identification and location of micro defects in large thickness disks and plates, the collinear anisotropic longitudinal wave mixing method is used to identify micro defects through sum and difference frequency signal characteristics; The influence of the change of defect buried depth on the mixing effect is studied. The depth location of micro defects is realized by measuring the amplitude change of differential frequency signal. The results show that this method can effectively identify the φ0.2mm transverse hole micro defects with a buried depth of 80mm in 7075 aluminum alloy, and can realize the depth location of micro defects. |
| DOI：10.11684/j.issn.1000-310X.2022.06.013 |
| 中文关键词: 共线异侧混频 和差频信号 微小缺陷定位 |
| 英文关键词: Collinear opposite side mixing Sum difference frequency signal Minor defect location |
| 基金项目: |
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