Paper Title:
A Nondestructive Study on Fiber Layup and Porosity Level in CFRP Composite Laminates Using Ultrasonic Pitch-Catch Method
  Abstract

A nondestructive technique would be very useful for evaluating the CF/Epoxy composite laminates. It is found that a pitch-catch signal was more sensitive than normal incidence backwall echo of longitudinal wave to subtle flaw conditions in the composites (damages, fiber orientation, low level porosity, ply waviness, and cracks). The depth of the sampling volume where the pitch-catch signal came from was relatively shallow with the head-to-head miniature Rayleigh probes, but the depth can be increased by increasing the separation distance of the transmitting and receiving probes. Also, a method was utilized to determine the porosity content of a composite lay-up by processing micrograph images of the laminate. The porosity content of a composite structure is critical to the overall strength and performance of the structure. The image processing method developed utilizes a free software package to process micrograph images of the test sample. The results from the image processing method are compared with existing data. Beam profile was characterized in unidirectional CFRP (Carbon fiber reinforced plastics) with using pitch-catch Rayleigh probes and the one-sided and two-side pitch-catch technique was utilized to produce C-scan images with the aid of the automatic scanner. Also, it is confirmed that the pitch-catch ultrasonic signal was corresponding with simulated results assuming in unidirectional CFRP composites.

  Info
Periodical
Advanced Materials Research (Volumes 123-125)
Edited by
Joong Hee Lee
Pages
815-818
DOI
10.4028/www.scientific.net/AMR.123-125.815
Citation
K. H. Im, J. W. Park, D. K. Hsu, S. K. Kim, Y. T. Cho, Y. J. Yang, I. Y. Yang, "A Nondestructive Study on Fiber Layup and Porosity Level in CFRP Composite Laminates Using Ultrasonic Pitch-Catch Method", Advanced Materials Research, Vols. 123-125, pp. 815-818, 2010
Online since
August 2010
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, In Young Yang, Kwang Hee Im, David K. Hsu, Sung Jin Song, Hak Joon Kim, Young Tae Cho
Abstract:In particular, CFRP (carbon fiber reinforced plastics) composite materials have found wide applicability because of their inherent design...
267
Authors: Jae Woung Park, Kwang Hee Im, David K. Hsu, Uk Heo, K.S Lee, Y.H. Kim, Sun Kyu Kim, In Young Yang
Abstract:A nondestructive technique would be very beneficial, which could be used to test the CF/Epoxy composite laminates. A new method for...
299
Authors: Wen Zhong Qu, D.J. Inman
Chapter 3: Vibration Control and Condition Monitoring
Abstract:Among structural health monitoring (SHM) techniques, Lamb waves is frequently used as diagnostic tools to detect damage in plate-like...
621
Authors: Pawel Malinowski, Tomasz Wandowski, Wieslaw Ostachowicz
Abstract:The reported research concerns experimental investigation toward the monitoring of an aircraft panel. Guided wave propagation phenomena were...
107
Authors: Zhong Meng Wen, Xiao Lu Gong
Chapter 3: Engineering Application
Abstract:This work investigates the effect of residual stresses on the damage of composite laminate. The incremental hole-drilling method is applied...
361