변형 가능한 전단 반구형 내부 심재를 가진 초경량 금속 샌드위치 판재의 충격 특성 분석
- Author(s)
- 남경흠
- Issued Date
- 2009
- Abstract
- Recently, the needs for the development of the light-weight materials with high stiffness and crashworthiness have been increased to improve the safety of passengers and the energy efficiency of transport vehicles. The objective of this thesis is to investigate into the impact characteristics of ultra-light weight sandwich panel with deformable sheared dimple inner structures. Two types of impact experiments, including drawing and plane strain bending types, were performed via a drop impact tester. From the results of the experiments, the influence of impact conditions on the deformation behaviors, the force-deflection relationships and the energy absorption characteristics were investigated. The deformed shape of the inner structures were measured by the X-ray CT system. From the results of the measurement, it was shown that the excessive deformation of the dimple structures in the vicinity of the impacted region takes place and the deformation of the dimple structures in the outside of the impact region is negligible. In order to examine the performance of the ultra-light weight sandwich panel quantitatively, the impact characteristics of the designed panel were compared to those of SPFC 780 panel. The SPFC 780 panel is an advanced high strength steel, which are used in the bumper back beam. The results of the comparison showed that the energy absorption rate per mass of the ultra-light weight sandwich panel is higher than that of the SPFC 780 plane and the contact force of the ultra-light weight sandwich panel is lower than that of the SPFC 780 plane. In addition, it was noted that the deflection of the designed ultra-light weight sandwich panel is lower than that of SPFC 780 before the failure initiation of the deformable sheared dimple inner structures. Three-dimensional nonlinear finite element analysis was performed via a commercial code ABAQUS Explicit in a condition of the plane strain bending. Through the comparison of the results of experiments with those of the analysis, a proper FE analysis model was obtained. The initial time of the failure of the inner structures were estimated through the FE analysis. The results of the FE analysis showed that an initial time of the failure of the inner structures decreases when the impact energy increases. In addition, it was shown that the reaction force of the impact head decreases abruptly when the failure of the inner structures initiates. From the results of the FE analysis, the influence of the impact energy on the plastic strain, the effective stress and the plastic dissipation energy distribution in the ultra-light weight sandwich panel with deformable sheared dimple inner structures.
- Alternative Title
- A study on impact characteristics of a ultra-light weight sandwich panel with deformable sheared dimple inner structures
- Alternative Author(s)
- Nam, Gyeong Heum
- Affiliation
- 조선대학교
- Department
- 일반대학원 기계공학과
- Advisor
- 안동규
- Awarded Date
- 2010-02
- Table Of Contents
- LIST OF TABLE Ⅰ
LIST OF FIGURES Ⅱ
NOMENCLATURES Ⅴ
ABSTRACT
제 1 장 서 론 1
제 1 절 연구배경 및 관련연구 1
제 2 절 연구목적 및 방법 4
제 2 장 ISB 판재 제작 5
제 1 절 전단 변형이 가능한 딤플 형상의 금속 내부 구조체를 가진 ISB 판재의 제작 과정 5
제 3 장 ISB 판재의 내충격 특성 시험‧평가 6
제 1 절 낙하 하중 방식의 충격 시험기기 6
제 2 절 ISB 판재의 내충격 시험 방법 9
1. 드로잉 경계조건에서 내충격 시험 9
2. 평면변형 경계조건에서 내충격 시험 10
제 3 절 ISB 판재의 내충격 특성 평가 방법 12
제 4 장 ISB 판재의 내충격 시험 및 내충격 특성 평가 13
제 1 절 드로잉 경계조건에서 내충격 시험 13
1. 전단 반구형 내부 구조체와 용접된 ISB 판재에 대한 실험 결과 및 고찰 13
2. SPFC 780 판재에 대한 내충격 실험 결과 및 고찰 20
3. 드로잉 경계조건에서의 내충격 특성 비교/분석 25
제 2 절 평면 변형 경계조건에서의 내충격 시험 34
1. 전단 반구형 내부 구조체와 용접된 ISB 판재에 대한 실험 결과 및 고찰 34
2. 평면 변형 경계조건에서의 내충격 특성 비교/분석 37
제 5 장 ISB 판재의 내충격 특성에 대한 3차원 유한요소해석 40
제 1 절 평면 변형 경계조건에 대한 3차원 유한요소해석 기법 도출 및 유한요소해석을 통한 ISB 판재의 내충격 특성 분석 40
1. 유한요소해석방법 및 모델링 40
2. 경계조건 및 재료 물성 42
3. 3차원 내충격 유한요소해석 모델의 검증 44
4. ISB 판재의 내충격 유한요소해석 결과 및 고찰 48
제 6 장 결 론 56
REFERENCES 58
감사의 글
- Degree
- Master
- Publisher
- 조선대학교 대학원
- Citation
- 남경흠. (2009). 변형 가능한 전단 반구형 내부 심재를 가진 초경량 금속 샌드위치 판재의 충격 특성 분석.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/8501
http://chosun.dcollection.net/common/orgView/200000239354
-
Appears in Collections:
- General Graduate School > 3. Theses(Master)
- Authorize & License
-
- AuthorizeOpen
- Embargo2010-01-25
- Files in This Item:
-
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.