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研究生:林彥亨
研究生(外文):Yan-Heng Lin
論文名稱:複材結構之脫層分析
論文名稱(外文):Analysis of Composite Delamination
指導教授:胡潛濱
指導教授(外文):Chyanbin Hwu
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:86
中文關鍵詞:複合材料破裂判據脫層
外文關鍵詞:composite materialfracture criteriondelamination
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在複材結構的使用上,最常發生類似脫層的行為,進一步拓展會造成結構的破壞,因此在評估複材脫層的損壞程度上,便有相關的判據來幫助了解結構較易發生危險的位置。
本文之研究內容,主要利用層間應力破壞判據,脫層彎矩判據及脫層應力強度因子起裂判據此三項破壞準則來幫助分析直昇機尾桿構件,並且針對裂縫尖端部分之網格化做一番探討及研究。在構件分析上,先藉由有限元素分析,利用子模型方法,去取得整體構件受力之後的應力場及位移場分佈情況,再經計算程式之數值計算,取得破壞參數,進而由相關破裂判據去觀察分析資料,評估結構較易產生脫層起裂的疊層位置。
藉由本文中三種破壞判據的相互驗證所獲得的分析結果,可用來幫助在此構件的脫層分析,提供一設計上的參考方針,以期能有效減低構件損壞行為的發生,增強構件的強度及使用率。
One of the most encountered problems in the using of composite structures is delamination whose extension will make the structure break. So in judging the level of damage, there are have some criteria helping us to understand the dangerous locations in the structure.
In the article, three different fracture criteria are used to study the delamination fracture. The basic parameters of these criteria are interlaminar stresses, respectively, delamination moments and delamination stress intensity factors. By using these criteria, we hope to predict the most probable delamination location of the helicopter tail structure. In analysis, first using the finite element method to get the stress and displacement fields in the whole structure and the local delamination fields, and then evaluating the related fracture parameters by programs. Finally, we can use the fracture criteria to judge the delamination onset. From the analysis data, we try to estimate the delamination locations of the tail part. It is hopeful that our results can be used as a reference data for the helicopter design.
摘要
英文摘要
誌謝
目錄---------------------------------------------i
表目錄-------------------------------------------iii
圖目錄-------------------------------------------v
符號說明-----------------------------------------vii
第一章 緒論--------------------------------------1
1.1 前言-----------------------------------------1
1.2 文獻回顧-------------------------------------2
第二章 脫層破裂判據------------------------------4
2.1判據一:層間應力破壞判據----------------------4
2.2判據二:脫層彎矩判據--------------------------5
2.3判據三:脫層應力強度因子起裂判據--------------6
第三章 破裂參數之數值計算------------------------10
3.1 層間應力及脫層彎矩---------------------------10
3.2 應力強度因子---------------------------------11
3.2.1 裂縫尖端網格化-----------------------------11
3.2.2 應力強度因子之計算方法---------------------12
3.3 計算流程-------------------------------------15
3.4 收斂分析-------------------------------------15
3.4.1 含邊緣裂縫薄板承受均佈力作用---------------16
3.4.2 含中央裂縫薄板承受均佈力作用---------------17
3.4.3 DCB模擬分析--------------------------------17
3.5 結果討論-------------------------------------21
第四章 直昇機尾桿構件之模擬分析------------------24
4.1 分析構件介紹---------------------------------24
4.2 分析方法-------------------------------------24
4.3 分析元素及邊界條件---------------------------26
4.4 模擬分析與結果探討---------------------------26
4.5 脫層分析-------------------------------------28
第五章 結論與建議--------------------------------32
5.1 結論-----------------------------------------32
5.2 建議-----------------------------------------32
參考文獻-----------------------------------------33
附表---------------------------------------------35
附圖---------------------------------------------63
自述
著作權聲明
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