超声功率谱特征参数在复合材料孔隙率检测中的应用
Application of Characteristic Parameters of Ultrasonic Power Spectrum in Testing for Composite Porosity
摘 要
基于材料超声检测系统模型及功率谱分析，考察了碳纤维增强环氧树脂基(CFRP)复合材料的孔隙率(0.03%~2.3%)与主频、中心频率、加权功率谱频率、有限频带能量(ELFB)及主频对应的能量(EPF)等参数之间的相关性。结果表明:孔隙率在0.03%~0.67%范围内时，ELFB与孔隙率呈线性递减关系; 在0.67%~2.3%范围内，两者呈二次曲线递减关系; EPF与孔隙率的关系在0.64%左右两侧分别呈现出线性和二次曲线递减趋势。ELFB和EPF能有效表征CFRP的孔隙率。
功率谱特征参数
碳纤维增强环氧树脂基复合材料
孔隙率
ultrasonic testing
characteristic parameters of power spectrum
carbon fiber reinforced polymer
porosity
Abstract
The relationship between porosity of carbon fiber reinforced polymer from 0.03% to 2.3% and characteristic parameters, such as principle frequency, central frequency, frequency of weighted power spectrum, energy for limited frequency band(ELFB)and energy for principle frequency(EPF), was investigated based on the ultrasonic testing system model and the power spectrum analysis method for composite materials. The correlation between porosity，ELFB and EPF was mainly analyzed quantitatively. The results showed that ELFB decreased linearly when the porosity increased from 0.03% to 0.67%, while ELFB decreased according to quadratic equation when the porosity increased from 0.67% to 2.3%; the correlation between porosity and EPF changes from linear to quadratic curve when the porosity exceeded 0.64%; The changing of CFRP porosity can be characterized by ELFB and EPF effectively.
中图分类号 TG115.28
所属栏目 试验与研究
基金项目
收稿日期 2009/4/29
修改稿日期
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备注张雅静(1981-),女,硕士研究生。
引用该论文: ZHANG Ya-jing,LIN Li,LI Xi-meng. Application of Characteristic Parameters of Ultrasonic Power Spectrum in Testing for Composite Porosity[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2010, 46(3): 159～163
张雅静,林 莉,李喜孟. 超声功率谱特征参数在复合材料孔隙率检测中的应用[J]. 理化检验－物理分册, 2010, 46(3): 159～163
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参考文献
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【3】HAGSTRAND P-O, BONJOUR F, MANSON J-A E. The influence of void content on the structural flexural performance of unidirectional glass fibre reinforced polyp ropylene composites[J]. Composites: Part A (Applied Science and Manufacturing), 2005, 36(5): 705-714．
【4】西拉德J. 超声检测新技术[M]. 陈积懋, 余南廷,译. 北京:科学出版社, 1991: 471．
【5】MARTIN B G. Ultrasonic attenuation due to voids in fiber reinforced plastic[J]. NDT Int, 1976, 9: 242-246．
【6】STONE D E, CLARKE B. Ultrasonic attenuation as a measure of void content in carbon fiber reinforced plastics[J]. NDT, 1975, 8(3): 137-145．
【7】JEONG H, HSU D K. Experimental analysis of porosity induced ultrasonic attenuation and velocity change in carbon composites[J]. Ultrasonics, 1995, 33(3): 195-203．
【8】HALE J M, ASHTON J N. Ultrasonic attenuation in voided fiber reinforced plastics[J]. Non-destructive Testing International, 1988, 21(5): 321-326．
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【12】DAVID K H, KEVIN M U.A Morphological study of porosity defects in graphite-epoxy composites[J]. Review of Progress in Quantitative NDE,1987, 6B: 1175-1184．
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