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基于频域参量的石英复合材料孔隙超声表征方法研究
陆铭慧1, 张毅萍1, 刘磨2, 江淑玲1, 郑善朴1
1.南昌航空大学无损检测与光电传感技术及应用国家地方联合工程实验室, 南昌航空大学无损检测技术教育部重点实验室, 南昌 330063;2.中航飞机股份有限公司测试中心, 西安 710089
摘要:
孔隙率对复合材料性能有很大影响。针对高孔隙率复合材料超声表征不足问题,本文把超声功率谱特征和非线性特征应用于表征高孔隙石英酚醛复合材料的孔隙率,即在频域上对比研究孔隙对基波幅值的衰减及谐波幅值的滋生的影响。结果表明:二者均能有效表征高孔隙复合材料的孔隙率。基于频域基波分析的超声功率谱特征参量测量容易,随孔隙增加呈递减变化,在孔隙率较低时具有一定优势;基于谐波分析的超声二阶非线性特征参量,随孔隙增加呈递增变化,对高孔隙率表征更具优势。
关键词:  复合材料  高孔隙率  超声表征  功率谱
DOI:10.12044/j.issn.1007-2330.2018.06.016
分类号:TB559;TB551
基金项目:
Characterization of Porosity in Quartz Composites Based on Ultrasonic Frequency Domain Parameters
LU Minghui1, ZHANG Yiping1, LIU Mo2, JIANG Shuling1, ZHENG Shanpu1
1.National Engineering Laboratory for Nondestructive Testing and Optoelectronic Sensing Technology and Applications, Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063;2.Test Center, AVIC Aircraft Co., Ltd., Xian 710089
Abstract:
The porosity had a great influence on the properties of the composites. To solve the problem that ultrasound could not well characterize high porosity composite materials,the characteristics and nonlinear characteristics of ultrasonic power spectrum were applied to characterize porosity of high porosity quartz phenolic composites, which is the effect of pores on the attenuation of fundamental amplitude and the breeding of harmonic amplitude in frequency domain. The results show that both methods can effectively characterize the pore content of high porosity composites. It is easy to measure the ultrasonic power spectral characteristic parameters based on the fundamental analysis in frequency domain, and it decreases with the increase of pore, which has some advantages when the porosity is low. The second order nonlinear characteristic parameters of the ultrasonic wave based on harmonic analysis are increasing with the increase of porosity, which is more advantageous to the high porosity characterization.
Key words:  Composite material  High porosity  Ultrasonic characterization  Power spectrum