采用反射法对两组不同碳纤维复合材料试块进行了超声检测,并用快速傅立叶变换(FFT)方法分析了信号的频域特征.结果表明:超声衰减系数与频率之间存在线性关系,而且其斜率随孔隙率的增大而增大.孔隙对超声波的衰减作用使超声信号的峰值降低、频宽变窄且使中心频率降低.超声信号矩心频率的偏移与孔隙率之间、超声衰减率与孔隙率之间均呈线性关系.频域内的特征量与孔隙率之间的线性关系为建立正确的孔隙率频域蝌检测模型提供了基础.
参考文献
| [1] | Birt E A,Smith R A.A review of NDE methods for porosity measurement in fibre-reinforced polymer composites[J].NonDestructive Testing and Condition Monitoring,2004,46(11):681-686. |
| [2] | Bowles K H,Frimfong S.Void effects on the interlaminar shear strength of unidirectional graphite-fiber-reinforced composites[J].Journal of Composites Materials,1992,26:1487-1509. |
| [3] | Uhl K,Lucht B,Jeong H.Mechanical strength degradation of graphite fiber reinforced thermoset composites due to porosity[J].Review of Progress in Quantitative Nondestructive Evaluation,1988,7B:1075-1082. |
| [4] | Gurdal Z,Tomasino A P,Biggers S B.Effects of processing induced defects on laminate response:Interlaminar tensile strength[J].SAMPE Journal,1991,27(4):39-49. |
| [5] | 刘玲,路明坤,张博明,等.孔隙率对碳纤维复合材料超声衰减系数和力学性能的影响[J].复合材料学报,2004,21(5):116-121.Liu Ling,Lu Mingkun,Zhang Boming,et al.Effects of porosity on the ultrasonic absorption coefficient and mechanical strength of carbon/epoxy composites[J].Acta Materiae Com positae Sinica,2004,21(5):116-121. |
| [6] | Almeida S F M,Nogueira Neto Z S.Effects of void content on the strength of composite laminates[J].Comp Struct,1994,28(8):139-148. |
| [7] | Jeong H.Effects of voids on the mechanical strength and ultrasonic attenuation of laminated composites[J].Journal of Composite Materials,1997,31(3):276-291. |
| [8] | 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. |
| [9] | Hsu David K,Uhl Kevin M.A morphological study of porosity defects in graphite-epoxy composites[J].Review of Progress in Quantitative NDE,1988,6B:1175-1184. |
| [10] | Martin B G.Ultrasonic attenuation due to voids in fiberreinforced plastics[J].NDT International,1976,9(5):242-246. |
| [11] | Stone D E W,Clarke B.Ultrasonic attenuation as a measure of void content in carbon fibre reinforced plastics[J].Nondestructive Testing,1975(8):137-145. |
| [12] | 周晓军,游红武,程耀东.含孔隙碳纤维复合材料的超声衰减模型[J].复合材料学报,1997,14(3):99-106.Zhou Xiaojun,You Hongwu,Cheng Yaodong.Ultrasonic attenuation model of void-containing carbon-fiber reinforced plastics[J].Acta Materiae Compositae Sinica,1997,14(3):99-106. |
| [13] | 周晓军,莫锦秋,游红武.碳纤维复合材料分布孔隙率的超声衰减检测方法[J].复合材料学报,1997,14(3):107-114.Zhou Xiaojun,Mo Jinqiu,You Hongwu.Ultrasonic attenuation testing method for NDE of void content based on theoretical model and experiment calibration[J].Acta Materiae Compositae Sinica,1997,14(3):107-114. |
| [14] | Mouritz A P.Ultrasonic and interlaminar properties of highly porous composites[J].Journal of Composite Materials,2000,34(3):218-239. |
| [15] | Hsu D K,Nair S M.Evaluation of porosity in graphite-epoxy composite by frequency dependence of ultrasonic attenuation[J].Review of Progress in Quantitative Nondestructive Evaluation,1987,6B:1185-1193. |
| [16] | Batra N K.Ultrasonic spectral analysis for characterization of composites[J].Review of Progress in Quantitative Nondestructive Evaluation,1989,8B:1527-1533. |
| [17] | Hsu D K,Jeong H.Ultrasonic velocity change and dispersion due to porosity in composite laminates[J].Review of Progress in Quantitative Nondestructive Evaluation,1989,8B:1567-1573. |
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