Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Behavior of Sand during Large Stress Reversal in Torsion Shear Test

비틀림전단시험에 의한 대응력반전시 모래의 거동

  • 홍원표 (중앙대학교 공과대학 건설환경공학과) ;
  • 남정만 (제주대학교 해양과학대학 해양토목공학과)
  • Published : 1999.08.01
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Abstract

Torsion shear tests under various stress paths were performed to study the behavior of sand during large stress reversal. The stress paths can be classified into the clockwise and the counterclockwise according to torque applied to specimen, and the directions of plastic strain incremental on the stress paths including large stress reversal are compared with the direction of stress state and stress incremental. From test results, the isotropic hardening theory using the principle of St. Venant desirably showed that direction of plastic strain incremental coincided with stress state on primary loading part and nearby failure point, but it might result in a rough approximation on part of unloading and reloading by stress reversal.

대응력반전시 모래의 거동을 연구하기 위하여 여러 가지 응력경로에 따른 비틀림전단시험이 수행되었다. 응력경로는 토르크의 작용방향에 따라 시계방향과 반시계방향으로 구분할 수 있으며 대응력반전을 포함하는 응력경로에 대한 소성변형률증분의 방향이 응력상태 및 응력증분의 방향과 비교된다. 이들 시험 결과로부터, St, Venant의 원리를 이용한 등방경화이론은 최초재하와 파괴점 부근에서 소성변형률증분의 방향이 응력의 방향과 일치하는 좋은 결과를 나타내었으나 응력반전에 의한 감하과 재재하 부분에서는 차이가 있는 것으로 나타났다.

Keywords

References

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