| 肖佳辰,陈果,卢超*,何双起,陈颖.复合材料冲击损伤非线性振动声调制检测技术的试验研究[J].实验力学,2018,33(6):949~956 |
| 复合材料冲击损伤非线性振动声调制检测技术的试验研究 |
| Experimental investigation on nonlinear vibro-acoustic modulation detection technique for impact damage of composite materials |
| 投稿时间：2017-08-04 修订日期：2017-10-19 |
| DOI：10.7520/1001-4888-17-157 |
| 中文关键词: 非线性超声 振动声调制 复合材料 冲击损伤 |
| 英文关键词:nonlinear ultrasonic vibro-acoustic modulation composites impact damage |
| 基金项目:国家自然科学基金(11374134)，航天科技创新基金(BA201408258),南昌航空大学研究生创新专项资金项目(YC2016049) |
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| 中文摘要: |
| 复合材料因其优良性能在航空航天领域应用广泛，但其受低速冲击后强度与结构完整性会严重下降。非线性振动声调制技术作为一种检测范围广、检测精度高的无损检测新技术，能对结构中的接触缺陷进行有效检测。本文制作了含冲击损伤试样，通过选取合适的高频超声激励频率，分别在不同的低频振动幅值及模态频率下对含冲击损伤复合材料进行检测。研究结果表明，非线性振动声调制技术能对含冲击缺陷试样与参考试样进行有效区分，调制系数与低频激励幅值呈近似线性关系。检测时需选取合适的频率及幅值。缺陷处振动不剧烈且低频激励幅值较小时，较小冲击能量损伤试样与参考试样不易区分；缺陷处振动剧烈时，输入较低的低频幅值即可较易分辨参考试样与损伤试样。 |
| 英文摘要: |
| Composite material is widely used in aerospace due to its excellent properties, but its strength and structural integrity will decrease seriously after subjected to low speed impact. As a new nondestructive testing technique with wide detection range and high detection precision, nonlinear vibration acoustic modulation technique can effectively detect the contact defects in structure. In this paper, samples with impact damage were prepared firstly. By selecting appropriate high frequency ultrasonic excitation frequency, composite samples with impacted damage were tested under different low frequency vibration amplitudes and modal frequencies respectively. Experimental results show that nonlinear vibration acoustic modulation technique can effectively distinguish the impact specimen from the reference specimen.The modulation coeffiient is approximately linear with the low frequency excitation amplitude. The proper frequency and amplitude should be selected in testing. When the vibration at the defect is not severe and the amplitude of the low frequency excitation is small, the smaller impact energy damage specimen is not easily distinguishable from the reference specimen. When the vibration of the defect is severe, the reference specimen and damage specimen can be easily distinguished by input lower frequency amplitude. |
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