TITLE

Acoustography as a means of monitoring impact damage in composites under fatigue conditions

AUTHOR(S)
Chen, A. S.; Almond, D. P.; Harris, B.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1239
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Acoustography is a novel ultrasonic imaging technique in which the ultrasound that passes through a test piece from a broad sound source is imaged by a liquid crystal screen acousto-optic detector. Its advantage is that large area real-time ultrasonic images can be produced without the need for scanning. An acoustography system has been adapted to image defects in samples whilst they are subjected to fatigue in a dynamic mechanical testing machine. The samples studied are of aircraft carbon fiber composite which have been impact damaged at the “barely visible impact damage” (BVID) level. The aim of the work is to determine “safe” zero damage growth fatigue lives of the composites. The integration of the acoustography imaging system and the fatigue testing machine will be explained. The data taking and image analysis procedures developed to provide quantitative measures of damage size as a function of fatigue cycles will be outlined. Damage growth data will be presented. © 2000 American Institute of Physics.
ACCESSION #
6029266

 

Related Articles

  • A truly hyperbolic elastic metamaterial lens. Joo Hwan Oh; Hong Min Seung; Yoon Young Kim // Applied Physics Letters;2/17/2014, Vol. 104 Issue 7, p073503-1 

    Sub-wavelength imaging is possible if metamaterial lenses realizing hyperbolic or elliptic Equi-Frequency Contours (EFCs) are used. Theoretically, lenses exhibiting hyperbolic EFCs allow imaging with unlimited resolution, but only metamaterials of elliptic EFCs producing limited resolution have...

  • Characterization of piezoelectric ceramics and 1-3 composites for high power transducers. Jae Lee, Hyeong; Zhang, Shujun; Meyer, Richard J.; Sherlock, Nevin P.; Shrout, Thomas R. // Applied Physics Letters;7/16/2012, Vol. 101 Issue 3, p032902 

    The high power characteristics of various piezoelectric ceramics and 1-3 composites were investigated. In contrast to 'hard' Pb(Zr,Ti)O3, modified (Bi0.5Na0.5)TiO3 based ceramics were found to show a relatively linear electromechanical response under high drive conditions due to their high...

  • High Contrast Ultrasonic Imaging of Resin-Rich Regions in Graphite/Epoxy Composites Using Entropy. Hughes, Michael S.; McCarthy, John E.; Bruillard, Paul. J.; Marsh, Jon N.; Wickline, Samuel A. // AIP Conference Proceedings;2016, Vol. 1706 Issue 1, p1 

    This study compares different approaches for imaging a near-surface resin-rich defect in a thin graphite/epoxy plate using backscattered ultrasound. The specimen was created by cutting a circular hole in the second ply; this region filled with excess resin from the graphite/epoxy sheets during...

  • Internal Damage Detection in a Laminated Composite Plate Using Ultrasonic Guided Waves. Lissenden, Cliff J.; Fei Yan; Hauck, Eric T.; Noga, Dawn M.; Rose, Joseph L. // AIP Conference Proceedings;2007, Vol. 894 Issue 1, p1029 

    Fatigue damage in laminated composite plates has been detected using ultrasonic guided waves. The quasi-isotropic plates were subjected to constant amplitude cyclic bending to induce fatigue damage. Cycling was automatically interrupted periodically for ultrasonic monitoring via an array of six...

  • EVALUATION OF DELAMINATION IN CFRP COMPOSITE BY LASER GENERATED ULTRASOUND. Ha, Young-Joon; Lee, Seung-Joon; Lee, Joon-Hyun; Byun, Joon-Hyung // AIP Conference Proceedings;2/28/2008, Vol. 975 Issue 1, p958 

    The objective of this research is to develop non-contact and real time inspection technique based on laser generated ultrasound to evaluate delamination in CFRP composite fabricated from developed 3-dimensional fiber placement system. In order to investigate the reception ability of ultrasonic...

  • UÇAK BAKIMINDA DARBE HASARININ TAHRÄ°BATSIZ KONTROLÃœ. Kayrak, Müge Armatlı // Engineer & the Machinery Magazine;haz2012, Issue 629, p34 

    Impact loads cause several type of defects in the aircraft structure. Sometimes the loads cause small defects on the surface. On the other hand high energy impact loads may break the structure. Foreign object and bird strike, rain, hail can be given as impact load examples. During improper...

  • Advances in thermosonics for detecting impact damage in CFRP composites. Barden, T. J.; Almond, D. P.; Morbidini, M; Cawley, P // Insight: Non-Destructive Testing & Condition Monitoring;Feb2006, Vol. 48 Issue 2, p90 

    Thermosonics, or ultrasound stimulated thermography, has been shown to reveal structural defects such as impact damage in CFRP that are not detectable by conventional optically stimulated thermography. However, there are concerns that the large amounts of ultrasonic excitation energy employed to...

  • APPLICATION OF ULTRASONIC IMAGING TECHNIQUE AS STRUCTURAL HEALTH MONITORING TOOL FOR ASSESSMENT OF DEFECTS IN GLASS FIBER COMPOSITE STRUCTURES. Masonkina, Marija; Kalnins, Kaspars // Proceedings of the International Conference on Civil Engineering;2013, Vol. 4 Issue 1, p180 

    Structural Health Monitoring (SHM) is non-destructive testing technique which implements a damage detection and characterization strategy for engineering structures. It is widely applied for rapid condition screening with the aim to provide reliable information regarding the integrity of...

  • Ultrasonic Inspection of Composite Resin Restorative Materials. Barakat, Mirham A. Y. // International Journal of Engineering & Technology;Jun2014, Vol. 14 Issue 3, p1 

    Restorative materials, such as artificial heart valve, artificial members, artificial lens, etc, are regarded as abnormal materials that are implanted in a normal one. Non-destructive ultrasonic tool can characterize various materials. Therefore ultrasonic technique can be used to characterize...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics