| 孙茂循,项延训,肖飚,邓明晰.超声导波混频表征和定位早期局部损伤的研究进展[J].声学技术,2022,41(3):313~322 |
| 超声导波混频表征和定位早期局部损伤的研究进展 |
| Early detection of the localized damage using nonlinear mixing of guided waves: a review |
| 投稿时间：2021-09-06 修订日期：2021-11-14 |
| DOI：10.16300/j.cnki.1000-3630.2022.03.003 |
| 中文关键词: 非线性超声 超声导波 波束混频 局部损伤早期定位 |
| 英文关键词: nonlinear ultrasound ultrasonic guided waves wave mixing localization of early damage |
| 基金项目:国家自然科学基金(11774090、U1930202、51835003)、上海市自然科学基金(20ZR1451000)资助项目。 |
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| 中文摘要: |
| 超声导波具有远距离传输的特性，能够快速、有效地大范围检出薄板中的损伤或缺陷。非线性超声导波相较于传统超声导波，主要研究基波与材料中微观组织演化相互作用而产生的高阶谐波，对尺寸远小于基波波长的损伤或缺陷比较敏感。其中，超声导波的二次谐波相对容易激发，已被用于定量评估早期损伤。但是，超声导波的二次谐波容易受到测量系统非线性的干扰，并且无法定位材料中的局部损伤。超声导波混频在频率、模式、传播方向的选择上具有一定的灵活性，克服了二次谐波的缺点。目前，超声导波混频在理论、模拟和实验上取得了一定的进展，已被用于表征和定位金属材料中处于早期阶段的疲劳、热老化、微裂纹、冲击损伤和局部塑性变形等。高频段超声导波混频、兰姆波相向混频和非共线混频中差频谐波或和频谐波的传播性，以及更多类型损伤的定位和表征仍有待进一步研究。 |
| 英文摘要: |
| Guided waves can travel a long distance with lower attenuation. Therefore, they are applied to the rapid and effective large-scale inspection of defects and damages in the thin plates. Compared with classical ultrasound technique, nonlinear guided wave mainly focuses on the high-order harmonics generated from the nonlinear interaction of monochromatic ultrasonic wave and microstructural evolution. High-order harmonics show high sensitivity to the defects or damages, whose size are much smaller than the corresponding wavelength of fundamental waves. The second harmonic of guided wave has been widely utilized to quantitatively evaluate the early damages since they can be easily excited. However, this method cannot determine the position of the localized damage. Meanwhile, the second harmonic of ultrasonic guided waves is susceptible to the nonlinearity of the measurement system, making it difficult to distinguish the sources of nonlinearity. Corresponding shortcomings can be solved by the nonlinear mixing of guided waves since their frequencies, modes, and even the propagation directions can be flexibly selected. Up to now, theoretical, numerical and experimental investigations of the nonlinear guided wave mixing have been conducted, and they have already been utilized to assess the localized fatigue, thermal aging, micro-cracks, impact damage, and the deformation during creep. In addition, the following problems will be considered in the future, such as nonlinear mixing of guided waves at high frequencies, and the propagation properties of second-order harmonics generated from the non-collinear mixing of Lamb waves, as well as the interaction between the difference harmonics or sum harmonics and other types of damages. |
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