Department News
The mechanical behavior of aluminum honeycombs under multiaxial loads
Seminar Date
2005-05-23
Author
임아주
Date
2005-05-13
Views
1966
1. 제 목 : The mechanical behavior of aluminum honeycombs under multiaxial loads
2. 연 사 : Sung-tae Hong
3. 일 시 : 5월 23일 (월) 오후 4시 ~
4. 장 소 : 301동 15층 세미나실
5. 내 용 :
Crush behavior of aluminum honeycombs has been experimentally investigated. First, the quasi-static crush behavior of aluminum honeycomb specimens under proportional combined loads is investigated. The combined loading tests included simultaneous compressive and shear loads parallel and perpendicular to the out-of-plane axis of the honeycomb specimens, respectively. As expected, the shear loads lower the normal crush strengths. A phenomenological yield criterion for specimens with different in-plane orientation angles is proposed based on the experimental results. The experimental results suggest non-normality plastic flow based on the yield criterion. The energy absorption rate depends upon the ration of the shear stress to the compressive stress and the in-plane orientation angle.
Secondly, the quasi-static crush behavior of aluminum honeycomb specimens under non-proportional combined loads is investigated. Combined loads and pure compressive loads were applied in different sequences to induce non-proportional combined loads. The sequence of loading paths for the non-proportional combined loads does not affect the crush strengths of honeycomb specimens. Specimens crushed under non-proportional combined loads show developments of different stacking patterns of folds in different loading regions of the non-proportional combined loads. The incremental stress-strain relation for the transition loading path from one state to another state on the crush yield surface may be related to the displacement increments that correspond to the change of
microscopic folding mechanisms.
Finally, the quasi-static and dynamic crush behaviors of aluminum honeycomb
specimens under inclined loads were also investigated
6. 약 력 :
Post-doc., 1/05-present, the University of Michigan
Ph.D. in mechanical engineering, 1/87-12/04, the University of Michigan
M.S. in mechanical engineering, 3/93-2/95, Yonsei University
B.S. in mechanical engineering, 3/89-2/93, Yonsei University
7. 문 의 : 기계항공공학부 오수익 교수 (☏ 880-7151)
2. 연 사 : Sung-tae Hong
3. 일 시 : 5월 23일 (월) 오후 4시 ~
4. 장 소 : 301동 15층 세미나실
5. 내 용 :
Crush behavior of aluminum honeycombs has been experimentally investigated. First, the quasi-static crush behavior of aluminum honeycomb specimens under proportional combined loads is investigated. The combined loading tests included simultaneous compressive and shear loads parallel and perpendicular to the out-of-plane axis of the honeycomb specimens, respectively. As expected, the shear loads lower the normal crush strengths. A phenomenological yield criterion for specimens with different in-plane orientation angles is proposed based on the experimental results. The experimental results suggest non-normality plastic flow based on the yield criterion. The energy absorption rate depends upon the ration of the shear stress to the compressive stress and the in-plane orientation angle.
Secondly, the quasi-static crush behavior of aluminum honeycomb specimens under non-proportional combined loads is investigated. Combined loads and pure compressive loads were applied in different sequences to induce non-proportional combined loads. The sequence of loading paths for the non-proportional combined loads does not affect the crush strengths of honeycomb specimens. Specimens crushed under non-proportional combined loads show developments of different stacking patterns of folds in different loading regions of the non-proportional combined loads. The incremental stress-strain relation for the transition loading path from one state to another state on the crush yield surface may be related to the displacement increments that correspond to the change of
microscopic folding mechanisms.
Finally, the quasi-static and dynamic crush behaviors of aluminum honeycomb
specimens under inclined loads were also investigated
6. 약 력 :
Post-doc., 1/05-present, the University of Michigan
Ph.D. in mechanical engineering, 1/87-12/04, the University of Michigan
M.S. in mechanical engineering, 3/93-2/95, Yonsei University
B.S. in mechanical engineering, 3/89-2/93, Yonsei University
7. 문 의 : 기계항공공학부 오수익 교수 (☏ 880-7151)
