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2013 Vol.15, Issue 4 Preview Page
Effect of size and slope angle of tooth-shaped asperity on shear fracturing characteristics

삼각형 돌출부의 크기 및 경사각이 전단파괴 형상 특성에 미치는 영향

Won-Keun Kim1
,
Woo-Yong Choi2
,
Jong-Deok Park2
,
Seok-Won* Lee3*
김 원근1
,
최 우용2
,
박 종덕2
,
이 석원*3*
1Korea Water Resources Corporation
2Konkuk University, Dept. of Civil and Environmental System Engineering, Master Student
3Konkuk University, Dept. of Civil and Environmental System Engineering, Professor
1한국수자원공사
2건국대학교 사회환경시스템공학과 석사과정
3건국대학교 사회환경시스템공학과 교수
*교신저자. *Corresponding Author. 
31 July 2013. pp. 431-442
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Abstract

Most of previous studies have insufficiently investigated the shear behavior and fracturing characteristics, experimentally in respect to the change of size of tooth-shaped surface asperity such as length and slope angle in a broad range. This study investigates the influence of the length and slope angle of a tooth-shaped surface asperity on the fracturing characteristics and the interface shear strength by using direct shear test apparatus. A total of 36 interface direct shear tests were conducted by changing the three types of slope angle of surface asperity, four type of length, and three types of normal stress. The shape of fractured surface after the test was quantified by using a three-dimensional surface roughness measurement apparatus. Through the experimental test results, the characteristics of fractured shape of surface asperity according to the normal stress were investigated. In addition, fractured length and height were quantified at each slope angle of surface asperity under a certain normal stress condition.

Keywords
Tooth-shaped asperity
Shear behavior
Size effect
Fractured shape
Surface asperity

기존의 연구에서 삼각형 돌출부의 크기 즉 돌출부 길이 및 돌출부 경사각 변화에 따른 전단거동 및 파괴 형상 특성에 대한 광범위한 실험적 연구는 부족하였다. 본 연구에서는 직접전단시험기를 사용하여 삼각형 돌출부의 전단거동에 있어서 돌출부의 길이 및 경사각 특성이 표면 돌출부의 파괴 형상 특성에 미치는 영향을 규명하고자 한다. 이를 위하여 돌출부 길이는 4가지로 변환하였고, 수직응력은 3가지로, 그리고 돌출부 경사각은 3개의 각도로 변환하면서 총 36회의 시험을 수행하였다. 시험을 수행한 시편은 3차원 형상측정기를 사용하여 파괴 형상 특성을 정량적으로 분석하였다. 이러한 시험을 통하여, 수직응력 변화에 따른 돌출부의 파괴 형상 특성을 조사하였다. 또한 각각의 경사각에서 돌출부의 길이를 변화시켜 시험을 수행함으로써, 특정 수직응력 하에서 돌출부가 파괴되는 길이 및 높이를 정의하였다.

키워드
삼각형 돌출부
전단거동
크기효과
파괴형상
표면 돌출부
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 15
  • No :4
  • Pages :431-442
  • Received Date : 2013-07-04
  • Revised Date : 2013-07-17
  • Accepted Date : 2013-07-26
  • DOI :https://doi.org/10.9711/KTAJ.2013.15.4.431
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