| 研究生: |
王凱正 wang, kai-zheng |
|---|---|
| 論文名稱: |
以單壓雙裂縫試驗量測石膏Ⅱ型破裂韌度之研究 The Measurement of the Mode II Fracture Toughness of Gypsum Using Short Beam Compression Test |
| 指導教授: |
王建力
Wang, Jian-li |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 93 |
| 中文關鍵詞: | 破裂韌度 、石膏 |
| 外文關鍵詞: | Fracture Toughness, Gypsum |
| 相關次數: | 點閱:85 下載:1 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
本研究針對一種類似軟岩性質之石膏材料,進行物理模型試驗,將此材料製備成具有雙裂縫之矩形試體,兩端施加均佈壓力,使其受到II型滑裂模態作用,以求取其II型破裂韌度。
本研究發現具圍束作用的試體破裂韌度明顯高於無圍束作用的試體。為達到II型滑裂模態之作用,本研究發現具束制作用的試體裂縫間距比介於0.1~0.25,無束制作用之試體,其裂縫間距比範圍介於0.1~0.3。若裂縫間距比超過此範圍,則試體破壞路徑將造成張力破壞。本研究進一步利用數值分析軟體ANSYS計算出II型應力強度因子迴歸公式,並與前人之研究成果比較,發現隨著裂縫間距比增加幾何校正係數亦隨之增加,與Ko & Kemeny等人之研究成果接近。
This study attempts to measure the Mode II fracture toughness of gypsum. The gypsum is usually modelled as a rock-like material. The experimental setup is based on the configuration of short beam compression. This study examines the influence of the seperation of crack interval and the effect of confinement on the shear strength of the samples. It is found that the test condition is favorable for Mode II when the seperation ratio is between 0.1 and 0.25 for the confined test and the seperation ratio is between 0.1 and 0.3 for the unconfined test. When the seperation ratio exceeds the specified range, the fracture condition will become an undesirable tensile failure. This study also uses a finite element package ANSYS to evaluate the correlation equation of stress intensity factor for the short beam compression test.
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