Paper Title:
Non-Contact and Contact Ultrasonic Detection of Fiber Orientation in Orthotropic Composite Laminates
  Abstract

Since layup orientation of the laminates greatly influences its properties, an NDE technique for layup orientation determination would be very beneficial. It is desirable to perform contact-less nondestructive evaluation to assess material properties and defects of composites because of permeation of coupling medium such as water. An ultrasonic technique would be very useful, which could be used to test the part after and before curing laminates and requires less time than the optical test. First of all, conventional ultrasonic experimentations were conducted using water as a transmitting medium. In contrast, air-coupled ultrasound is non-contact and has clear advantages over water-coupled testing. Therefore ultrasonic systems for air-coupled and conventional ultrasound were set out for different measurement modalities for acquiring ultrasonic signals as a function of in-plane azimuthal angle. Firstly, a manual scanner was built for making transmission measurements using a pair of normal-incidence shear wave transducers to find the effect of fiber misorientations of orthotropic composite laminates. With the transmitter and receiver on the same side of a laminates, Lamb waves were generated and used for the amplitude magnitude. As a result, it was confirmed that the influence of fiber direction in the laminates could be detected by the non-contacting or contacting inspection from one-side and the detectability was improved by using shaped tube for reducing the specular reflection on transmitting. Furthermore, a vector decomposition model was utilized for lay-up error of the orthotropic laminates. Finally, aircoupled results well corresponded somewhat to those of contact ultrasonic examination in the orthotropic laminates.

  Info
Periodical
Key Engineering Materials (Volumes 324-325)
Edited by
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
Pages
419-422
DOI
10.4028/www.scientific.net/KEM.324-325.419
Citation
I. Y. Yang, U. Heo, K. S. Lee, J. W. Park, Y. S. Kweon, D. K. Hsu, Y. T. Cho, C. H. Lee, K. H. Im, "Non-Contact and Contact Ultrasonic Detection of Fiber Orientation in Orthotropic Composite Laminates", Key Engineering Materials, Vols. 324-325, pp. 419-422, 2006
Online since
November 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Je Woong Park, Sun Kyu Kim, Young Nam Kim, In Young Yang, David K. Hsu, Kwang Hee Im
Abstract:Because the layup of composite laminates influences there properties, the strength of composites depends on layup sequence of CFRP laminates....
787
Authors: Joung Hwan Lee, Costas Soutis, Chang Duk Kong
Abstract:Existing test methods for thick-section specimens (≥ 4[mm]) have not provided precise compressive properties to date for the analysis and...
357
Authors: In Young Yang, Yong Jun Yang, Kil Sung Lee, David K. Hsu, Kwang Hee Im
Abstract:Owing to the advantages associated with their very large strength-to-weight and stiffnessto- weight ratios, composite materials are...
261
Authors: Kwang Hee Im, Je Woong Park, David K. Hsu, Sun Kyu Kim, Young Tae Cho, Yong Jun Yang, In Young Yang
Abstract:A nondestructive technique would be very useful for evaluating the CF/Epoxy composite laminates. It is found that a pitch-catch signal was...
815
Authors: Hang Li, Wen Xue Wang, Yoshihiro Takao, Terutake Matsubara
Abstract:This study investigates the tensile properties of UACS (unidirectional arrayed chopped strands) laminates with different slit patterns. UACS...
208