- 期刊
以四點彎曲試驗量測不同溫度作用下砂岩複合型斷裂韌度之研究
A STUDY OF THE MEASUREMENT OF MIXED MODE FRACTURE TOUGHNESS OF SANDSTONES UNDER VARIOUS THERMAL CONDITIONS BY FOUR-POINT BENDING EXPERIMENTS
摘要
本研究以砂岩為試驗材料，先將岩樣裁切製成含單裂縫矩型試體，接著將規劃之試體分別加熱至300°C與600°C後冷卻至室溫，再進行四點彎曲試驗以量取試體斷裂時之荷重與開口位移。本研究改變試體在不同受力點之跨距組合，設計五種不同之跨距產生純I型、三種I + II型、與純II型之斷裂型態，進行四點彎曲試驗量測I+II型斷裂韌度。在四點彎曲試驗中，紀錄斷裂時的荷重及開口位移，同時觀察斷裂時之樣態，並計算各種型態之斷裂韌度。最後討論不同溫度（25°C、300°C與600°C）作用下砂岩複合型斷裂韌度的試驗結果。結果顯示：溫度作用會造成試體之斷裂韌度降低。本研究利用簡單的四點彎曲試驗，建立一套有效的方法以量測砂岩的I + II複合型斷裂韌度。
並列摘要
This study proposes a single edge-cracked bending specimen under four-point bending configuration to measure the mixed-mode fracture toughness of rocks. The testing materials are sandstones. This study arranges the experimental setups of four-point bending tests for measurements of modes I + II fracture toughness. There are five different loading conditions for the mode I + II fracture toughness. These loading conditions are one mode I, three different modes I + II and one mode II. This study considers three thermal conditions: 25°C, 300°C, and 600°C. Mixed Modes fracture toughness for I + II are calculated. One observes that the mode I + II fracture toughnesses in 25°C condition are much higher than those in 300°C and 600°C conditions. Therefore, this study effectively utilizes a simple four-point-bending test to measure the mixed-mode fracture toughness of sandstones.
延伸閱讀
- 張育源、郭俊志、王建力（2018）。四點彎曲試驗下砂岩之複合型斷裂韌度與其基本力學性質之研究。鑛冶：中國鑛冶工程學會會刊，62(3)，36-40。https://doi.org/10.30069/MM.201809_62(3).0004
- 陳家豪、陳昭旭（2006）。利用環形裂縫試驗探討異向性大理岩之破裂韌度。鑛冶：中國鑛冶工程學會會刊，50(3)，82-91。https://doi.org/10.30069/MM.200609_50(3).0009
- 石作珉、廖志中、許松山（1989）。岩石及耐火磚類在剛性實驗器材壓力下破壞後之行為研究。鑛冶：中國鑛冶工程學會會刊，33(1)，145-155。https://doi.org/10.30069/MM.198903_33(1).0013
- 汪世輝、蔡佳偉、陳志豪、王建力（2009）。The Measurement of the Mode II Fracture Toughness of Adhesive Gypsum Using Short Beam Compression Test。鑛冶：中國鑛冶工程學會會刊，53(3)，46-52。https://doi.org/10.30069/MM.200909_53(3).0006
- Lai, Y. W. (2020). Effects of Low Temperature Austempering on the Microstructure Evolution and Mechanical Properties of Carbide-Free Bainite [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU202001210