| 研究生: |
詹奇峰 Jhan, Chi-Fong |
|---|---|
| 論文名稱: |
應力集中效應對表面疲勞裂縫之影響 The Effect Of Stress Concentration On The Propagation Characteristics Of Surface Crack |
| 指導教授: |
林忠宏
Lin, Chung-Hung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 造船及船舶機械工程學系 Department of Systems and Naval Mechatronic Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 55 |
| 中文關鍵詞: | 表面疲勞裂縫 、應力集中效應 |
| 外文關鍵詞: | Surface Crack, Stress Concentration |
| 相關次數: | 點閱:83 下載:5 |
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本文主要是利用疲勞實驗結果配合Newman and Raju理論來探討結構構件表面幾何形狀的不同,對於表面裂縫進展速率的影響。進而預測在不同應力集中下表面裂縫之疲勞壽命。
在實驗部分,在表面缺陷形狀上主要是以1/2橢圓形狀及1/4橢圓形狀再配合鋼板表面幾何形狀的不同去比較裂縫行為的差異。在疲勞實驗中,負荷範圍以應力比為0和0.5的範圍內去進行試片拉伸,及以Beach Mark的方法去判斷裂縫進展的速率及壽命。實驗所得結果,即可以根據表面方向及深度方向之裂縫進展速度配合理論公式去推算應力強度因子。
最後,以平板試片之材料係數做為基準,建立一個可以預測表面裂縫進展行為之模式,做為以後判斷應力強度因子及預測疲勞壽命的依據。
In order to predict the crack propagation or fatigue life , proper equations should be employed for the crack growth rate , which depend on various factors such as stress intensity range , material constants of crack growth resistance , stress ratio .
In this approach , I evaluate behavior of cracks growth depend on Paris’ Law and Newman and Raju’ equation . I experiment with steel material with surface cracks , and use beach mark method to measure cracks shape development .
Final , I set up one mode that can predict behavior of surface crack
. And predict mode can determine the stress intensity factor of surface crack .
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