脆性材料之裂面形态及机制初探-NationalTaiwanUniversity.PDFVIP

國立臺灣大學「台大工程」學刊 第八十五期 民國九十一年六月 第 49–57 頁 49 Bulletin of the College of Engineering, N.T.U., No. 85, June 2002, pp. 49–57 脆性材料之裂面形態及機制初探 STUDY ON THE FRACTORGRAPHY AND FAILURE MECHANISM OF BRITTLE MATERIALS 鄭富書 * 林銘郎* 林鴻州† Fu-Shu Jeng Ming-Lang Lin Hong-Cho Lin *副教授 †碩士 *† 國立台灣大學土木工程學系 * † Associate Professor M.S. Department of Civil Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C. Abstract The paper explores the underlain mechanism 本文嘗試運用裂形學與破裂力學作為工具，探討脆性材 associated with fracture of brittle materials based on the 料受不同應力方式的破壞機制，包括單壓試驗、巴西 人張力 characteristics fracture surface, fractography. Using 試驗及單壓斜裂縫試驗，同時探討破裂形式對實驗所得強度 CSTBD tests, the fracture process of the material was identified and the types of fracture, e.g., Type I or Type II 之影響 。單壓試驗中由於壓實錐之形成 ，造成破壞強度變高 。 then was distinguished. Meanwhile, it is also found that 另外 ，經由筆直穿透裂縫巴西人盤試驗及單壓斜裂縫試驗施 rib mark can be concave toward the direction of crack 作，釐清應力狀況對裂形的影響。同時本文之試驗結果顯示 ： propagation, and therefore, to identify the fracture process 肋紋有凸向破裂源點的情形發生，因此在現地的裂形觀察 ， should be based on more than one evidence to avoid 不宜只單靠某一裂形特徵，便急於進 行判釋，而需能輔以其 incorrect interpretation.