全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

超薄单向纤维增强复合材料低频多模式超声兰姆波定征方法

, PP. 20-24

Keywords: 复合材料,超声兰姆波,定量无损定征,色散特性

Full-Text   Cite this paper   Add to My Lib

Abstract:

提出低频多模式超声兰姆波定征方法来估计超薄层状单向纤维增强复合材料的密度、厚度、弹性常数等参数。这里"超薄"的概念是指材料厚度h远小于材料中的声波波长λ,导致在时域上材料前后界面的各次回波信号相互混迭。分析了沿平行和垂直于纤维两个方向上,在超薄层状单向纤维增强复合材料中传播的低频兰姆波色散特性,提出在最小二乘意义下以材料色散曲线为基础的反向算法对材料参数进行了估计。文中分析了影响估计准确性的各种因素,研究了该方法对材料参数的灵敏度及其在误差传递中的意义。结合超声漏兰姆波频域分析方法,并使用超声耦合剂耦合方式和一对中心频率为2MHz的宽带纵波换能器,实验结果证实,该方法能够准确估计h<0.05λ的单向玻璃纤维增强双酚A型聚砜(PSF)复合材料的材料参数。

References

[1]  Rokhlin S I, Wang W. Critical angle measurement of elastic constants in composite material[J]. J Acoust Soc Am, 1989, 86(5):1876-1882.
[2]  Rokhlin S I, Wang W. Measurement of elastic constant of very thin anisotropic plates[J]. J Acoust Soc Am,1993, 94(5): 2712-2730.
[3]  Kinra V K, Iyer V R. Ultrasonic measurement of the thickness, phase velocity, density or attenuation of a thin-viscoelastic plate. Part I: the forward problem[J]. Ultrasonics, 1995, 33(2): 95-110.
[4]  Kinra V K, Iyer V R. Ultrasonic measurement of the thickness, phase velocity, density or attenuation of a thin-viscoelastic plate. Part II: the inverse problem[J]. Ultrasonics, 1995, 33(2): 111-122.
[5]  Wan MX, JiangB, CaoWW. Direct measurement of ultrasonic velocity of thin elastic layers[J]. J Acoust Soc Am, 1997, 101(1): 626-628.
[6]  张 锐,万明习,钱 明.超薄弹性层低频超声频域定征方法[J].计量学报,1998, 19(4): 291~298.
[7]  张 锐,万明习,巩欣洲,等.低频多模式超声兰姆波超薄弹性层定征方法[J].计量学报,2000,21(1):1~9.
[8]  Nayfeh A H, Chimenti D E. Propagation of guided waves in fluid-coupled plates of fiber-reinforced composite[J]. J Acoust Soc Am, 1988, 83: 1736-1743.
[9]  Dayal, Vikram K. Leaky Lamb waves in an anisotropic plate——Ⅰ. an exact solution and experiments[J]. J Acoust Soc Am, 1989, 85(6): 2268~2276.
[10]  Chimenti D E. Martin R W.Nondestructive evaluation of composite laminates by leaky Lamb waves[J].Ultrasonics, 1991, 29(1): 13.
[11]  Balasubramaniam K, Rose J L. Physically based dispersion curve feature analysis in the NDE of composite[J]. J Research in Nondestructive Evaluation, 1991, 3: 41-67.
[12]  Thompson D O, Chimenti D E. Review of Propress in Quantitative Non-destructive Evaluation [M]. New York:Plenum Press,1991.1555-1560.
[13]  Guo N, Cawley P. Lamb wave reflection for the quick nondestructive evaluation of large composite laminates[J]. Materials Evaluation, 1994, 52(3): 404-411.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133