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이홍규(Hong-Gyu LEE) 한국암반공학회 2009 터널과지하공간 Vol.19 No.6
일본의 기후현의 카미오카광산은 지하 약 1,000 m의 대심도에, 우주에서 도래하는 소립자의 관측과 양자의 붕괴현상 등을 연구하기 위한 실험시설 SUPER-KAMIOKANDE가 건설되었다. 이 시설 설계를 위한 기초 자료의 하나로, 초기지압 측정을 실시하여 건설 예정지의 암반 응력 상태를 파악했다. 측정 방법은, 일본 전력중앙연구소(Central Research Institute of the Electric Power Industry)에서 개발한 8성분 변형률 게이지를 이용한 공경변화법, Sugahara와 Obara가 개발한 16성분 구면 게이지를 이용한 구면 공저변형법, 오스트레일리아의 CSIRO에 의해 개발된 Hollow Inclusion Cell을 이용한 공벽변형률법이다. 3종류의 방법에 의해 얻어진 결과가 일치하지는 않았지만, 6응력성분의 평균치를 이용하여 주응력 방향 및 크기를 결정하였다. The world’s largest nucleon decay experiment facility is constructed at a depth of approximately 1,000meters, in the Kamioka mine, Japan. Because of the character as a large cavern in deep underground, in-situ stress measurements were conducted to provide basic information for design of the cavern. Three overcoring methods were used: 8-element embedding gauges developed by Japanese Central Research Institute of Electric Power Industry, hemispherical ended borehole technique with eight strain cross-gauges, and Hollow Inclusion Cell with 12 strain gauges. The principle stresses were not perfectly similar in each measurement. The average values of the 6 stress element were used to provide the direction and the magnitude of three principle stress.
이방성 이종재 접합계면 균열의 에너지 해방률에 관한 연구
김진광(Jin-Kwang Kim),조상봉(Sang-Bong Cho) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
The energy release rate for an interface crack in anisotropic dissimilar materials was obtained by the eigenfunction expansion method and also was analyzed numerically by the reciprocal work contour integral method. It was shown that the results for orthotropic dissimilar materials are consistent with the other worker's results.
이방성 이종재 접합계면 균열의 에너지 해방률에 관한 연구
김진광,조상봉,Kim, Jin-Gwang,Jo, Sang-Bong 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
The energy release rate for an interface crack in anisotropic dissimilar materials was obtained by the eigenfunction expansion method and also was analyzed numerically by the reciprocal work contour integral method. It was shown that the results for orthotropic dissimilar materials are consistent with the other worker's results.
등방성체 동적 광탄성 하이브리드 법 개발 및 에너지 해방률에 대한 연구
하재기 김천과학대학 2001 김천과학대학 논문집 Vol.27 No.-
In this paper, dynamic photoelastic hybrid method is developed and its validity is certified. And dynamic energy release rate was calculated. The dynamic photoelastlic hybrid method can be used on the obtaining of dynamic stress intensity factors and dynamic stress components. The effect of crack length on the dynamic stress intensity factors is less than those on the static stress intensity factors. When structures are under the dynamic mixed mode load, dynamic stress intensity factor of mode I is almost produced.
이방성비가 큰 직교이방성체의 반 무한 균열에 대한 동적 에너지해방률에 관한 연구
백운철,황재석,Baek, Un-Cheol,Hwang, Jae-Seok 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.7
When an impact stress is applied on the external boundary of double cantilever beam of orthotropic material which crack length is greater than specimen hight and anistropic ratio is very high, dyna mic energy release rate is derived, and the relationship between dynamic energy release rate and crack propagating velocity is studied. Dynamic energy release rate to static energy release rate is decreased with increasment of crack propagating velocity. The relationships between dynamic energy release rate and vertical strain have a similar pattern with those between static energy release rate and vertical strain. When normalized time(Cstla) is greater than or equal to 2, dynamic energy release rate approaches to a constant value.