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SHPB 기법을 이용한 니트릴 고무(NBR)의 동적 변형 특성
최순철(Soon-Cheol Choi) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.1
The Split Hopkinson Pressure Bar(SHPB) technique with a special experimental apparatus can be used to obtain the material behavior under high strain rate loading conditions. The conventional Split Hopkinson Pressure Bar apparatus is modified by Pulse Shaper. The incident pulse gives pronounced effects to the specimens. The samples are in dynamic stress equilibrium and have nearly constant strain rate over most of the test duration. In this paper, we have modified the conventional SHPB technique by placing a Pulse Shaper on the impact surface of the incident bar. The details of dynamic stress equilibrium on the specimen surfaces are investigated. The dynamic deformation behaviors of a Rubber under compressive high strain rate are evaluated using the modified SHPB technique.
SM45C강의 용접·열처리후 피로 크랙에 미치는 잔류응력의 영향
최순철(Soon-Cheol Choi) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.2
Structural steels are usually welded by butt submerged arc. After effects of residual stress are considered about welding materials and PWHT materisls, the main conclusions obtained arc as follows 1. Althougth both the welding materials and the PWHT materials have a little difference at the initial crack tip, it is presented that compression residual stress exists. 2. The hardness distribution two-sided specimens has difference by the heat treatment effect of weld penetration heat in two-fold welding, but the hardness distribution of welding materials and PWHT materials were observed to be always the same thing.