Paper Title:
Inspecting Carbon Matrix Composites with Airborne/Conventional Ultrasound
  Abstract

Carbon/phenolic composite (CPC) materials have obvious advantages over conventional materials, which are consisting of carbon fibers embedded in a carbon matrix. The CPCs have become to be utilized as parts of aerospace applications and its low density, high thermal conductivity and excellent mechanical properties at elevated temperatures make it an ideal material for aircraft brake disks. Because of permeation of coupling medium such as water, it is desirable to perform contact-less nondestructive evaluation to assess material properties and part homogeneity. In this work, a C/P(Carbon/phenolic) composite material was characterized with non-contact and contact ultrasonic methods using automated acquisition scanner. Also through transmission mode was performed because of the main limitation for air-coupled transducers, which is the acoustic impedance mismatch between most materials and air. Especially ultrasonic images and velocities for C/C(Carbon/Carbon) composite disk brake was measured and found to be consistent to some degree with the non-contact and contact ultrasonic measurement methods. Low frequency throughtransmission scans based on both amplitude and time-of-flight of the ultrasonic pulse were used for mapping out the material property inhomogeneity. Measured results were compared with those obtained by the motorized system with using dry-coupling ultrasonics and through transmission method in immersion. Finally, results using a proposed peak-delay measurement method well corresponded to ultrasonic velocities of the pulse overlap method.

  Info
Periodical
Key Engineering Materials (Volumes 326-328)
Edited by
Soon-Bok Lee and Yun-Jae Kim
Pages
1789-1792
DOI
10.4028/www.scientific.net/KEM.326-328.1789
Citation
J. K. Sim, K. H. Im, D. K. Hsu, S. J. Song, H. Cho, H. J. Kim, Y. H. Seo, I. Y. Yang, "Inspecting Carbon Matrix Composites with Airborne/Conventional Ultrasound", Key Engineering Materials, Vols. 326-328, pp. 1789-1792, 2006
Online since
December 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: Gye Jo Jung, Yeon Shik Ahn, Yong Sang Cho, Sang Ki Park, Doo Song Gil, W.H. Lee
271
Authors: Eun Mi Kim, Ho Su Jang, Dong Sam Park
Abstract:Ultrasonic energy is spotlighted as a skill which connects detailed parts accurately and safely. So we designed the horn needed for attaching...
536
Authors: Shu You Zheng, Xipeng Xu
Abstract:Ultrasonic machining has been proven to be a promising machining method on hard and brittle materials. However, due to the absence of high...
150
Authors: Mark J. Eaton, Rhys Pullin, C.A. Featherston, Karen M. Holford
Abstract:Damage detection and location in aerospace composites is currently of great interest in the research community and is being driven by the...
381
Authors: Dong Lu, Hong Fu Huang, Yong Bo Wu, Ming Ming Yang
III. Micro/Nano-Fabrication
Abstract:Ultrasonic-vibration-assisted micro-cutting of Ti-6Al-4V was simulated by finite element analysis software ADVANTEDGE. During the...
345