English  |  正體中文  |  简体中文  |  Items with full text/Total items : 68069/68069 (100%)
Visitors : 23111017      Online Users : 344
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27063

    Authors: LAI,JY;YOUNG,KF
    Contributors: 機械工程學系
    Keywords: SPECIMENS
    Date: 1995
    Issue Date: 2010-06-29 18:06:47 (UTC+8)
    Publisher: 中央大學
    Abstract: The purpose of this work was to investigate the dynamics of a graphite/epoxy composite material with delamination fracture under various environmental conditions. Modal testing is proposed as a nondestructive method to evaluate the effects of a delamination crack on the natural frequency and damping ratio. The effects of both thermal damage and moisture content on the graphite/ epoxy composite material were studied. The experimental impulse responses were compared with simulated values. The results show that the fundamental mode dominates the dynamic characteristics and that the delamination crack may decrease the natural frequency, but increase the damping ratio of the specimen. After the specimen was exposed to high temperatures, the stiffness and hence the natural frequency were increased. The damping ratio was decreased significantly after the specimen was subjected to prolonged exposure to a humid environment. From correlation between modal parameters and delamination cracks, it was found that the method of modal analysis was suitable for nondestructive evaluation of composite materials.
    Appears in Collections:[機械工程研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明