저자명 김유종 
년도 2009 
front-end collision of the car is absorbed by tubular
steel columns installed in the automotive body, which are simply understood as spot-welded hat type
columns. It can be achieved both light and strong structure of the automotive body by increasing
crashworthiness of these energy absorbing members. There are many experimental and theoretical
researches on crashworthiness performance of hat type columns. However, in the previous studies,
influence of spot weld failure during the collision is ignored, even though it is unavoidable and greatly
affect crashworthiness of the member.
Objective of this research is to optimize dimension of the spot-welded hat type member for the
crashworthiness considering spot weld failure during the collision. Spot weld failures shown irregularly
in many experimental results are unpredictable, because of the inherent uncertainties of the spot
welds. In this paper, reliability based design optimization with response surface method is employed
to design reliable hat type member to deal with those uncertainties.
There are many reliability based design optimization algorithms, such as the reliability index
approach (RIA), the performance measure approach (PMA) and the sequential optimization and reliability
assessment method (SORA). These reliability based design optimization algorithms require
- ii -
intensive computation of the probabilistic constraint. Therefore, response surface method (RSM) is
usually used to relieve computational burdens. Consequently the approximation error occurs, which
can make the whole optimization process unreliable. To reduce this approximation error, a new response
surface methodology, “selective sampling method”, collaborated with sequential optimization
and reliability assessment (SORA) is developed. Two optimization problems for spot-welded
hat type member are solved by using this method. It has been demonstrated that the suggested optimization
algorithm with “selective sampling method” can search the most probable point (MPP) accurately
and it can reduce the approximation error of response surface and gives much reliable solution.
The difference between the two optimum designs using deterministic design optimization and
reliability based design optimization is discussed. The optimum mass derived by reliability based design
optimization is slightly greater than the optimum mass derived by deterministic design optimization.
Also, it is shown that the change of constraint has a different effect on those two optimum designs.
번호 제목 저자명 날짜 조회 수
49 Structural Design and Evaluation for Improvement of the Roof Strength of a Three-Wheel Vehicle(삼륜차의 루프 강도 향상을 위한 구조 설계 및 평가) file Jesung Yoo  2017.06.07 156
48 Tension/Compression Hardening Behavior of Auto-body Steel Sheets at Intermediate Strain Rates Ranging from 0.1/s to 50/s(중 변형률속도 0.1/s ~ 50/s 영역에서의 차체 강판의 인장/압축 경화 거동에 관한 연구) 주근수  2014.01.16 3405
47 Tensile Properties of Nugget Region in a Spot Weld at Various Strain-Rates (점용접 너겟부의 변형률속도에 따른 인장 물성에 관한 연구) 박문수  2014.01.16 3064
46 Validation of Dynamic Hardening Models at High Strain Rates Using Taylor Impact Tests (테일러 충격시험을 이용한 고 변형률속도 조건에서의 동적 경화모델 검증) 박명준  2013.09.02 3962
45 Tensile Material Properties of Carbon/epoxy Composite Laminates at High Strain Rates (탄소섬유강화 복합재료의 변형률 속도에 따른 인장물성의 평가) 최재영  2013.02.12 6139
44 Design and Dynamic Simulation of a New Shock Absorbing Device with a Bending Strap in a Helicopter Pilot Seat (헬리콥터 조종석의 굽힘 판재를 이용한 새로운 충격흡수장치의 설계 및 동적 모사해석에 관한 연구) [1] 박주형  2013.02.12 6288
43 Anisotropy Effect on the Fracture Forming Limit Diagram of DP980 Sheets Considering the Loading Path (DP980 강판의 하중경로를 고려한 파단성형한계도에 미치는 이방성의 영향) 박남수  2013.02.12 5363
42 Study on the Dynamic Failure Model of Structural Adhesive Joints under Combined Loading Conditions(차량 구조용 접착제를 이용한 접합부의 복합하중조건에서 동적 파단 특성 연구) 임승찬  2013.01.24 4777
41 Study on the Strain-Rate Dependent Tensile Properties of Micro-Scale Aluminum Specimens(알루미늄 마이크로시편의 변형률속도에 따른 인장 특성 연구) 권준범  2012.03.01 7074
40 Study on the Fracture Strain of DP780 Sheets Considering the Strain Rate and Loading Path (변형률속도와 하중경로를 고려한 DP780 강재의 파단변형률에 관한 연구) 박근환  2012.02.20 10815
39 Evaluation of Ultimate Buckling Strength of Stiffened Plates for Marine Structures (해양구조물용 보강판구조의 좌굴한계강도 평가) Waseem Gul  2010.07.13 7759
38 Study on Design of Stress Wave Micro Sensor for High Speed Transportation Safety System (고속운송기구의 안전시스템을 위한 마이크로 응력파 센서 설계 연구) 임성준  2010.07.13 6596
37 Study on the Anisotropy of Auto-body Steel Sheets considering the Strain Rate(변형률속도를 고려한 차체강판의 이방성에 관한 연구) 이창수  2010.07.13 7994
» Reliability Based Design Optimization for Crashworthiness of a Spot Welded Hat Type Member (점용접 모자형 사각관의 충돌성능에 대한 신뢰도 기반 최적설계) 김유종  2010.07.13 6354
35 Upper Bound Analysis of Dynamic Buckling Phenomenon of Circular Tubes Considering Strain Rate Effect (변형률 속도를 고려한 원형 튜브의 동적 좌굴 현상의 상계 해석에 관한 연구) 박충희  2008.08.02 6155
34 Study on the Crash Energy Absorption and Dynamic Local Buckling of the Expansion Tubes (확관튜브의 충돌에너지 흡수성능 및 동적 국부좌굴에 관한 연구) 안광현  2008.01.28 5458
33 Dynamic Material Properties of the Heat-Affected Zone (HAZ) in a Resistance Spot Weld(점용접 열영향부의 동적 물성특성에 관한 연구) 하지웅  2008.01.25 6931
32 Cross-section Shape Design of an Aluminum Crash Box for Crashworthiness Enhancement (충돌성능 향상을 위한 알루미늄 크래쉬 박스의 단면 형상 설계) [1] 이경호  2008.01.25 6511
31 Finite Element Inverse Analysis of the Sheet Metal Forming Process Considering Bending History (굽힘 이력을 고려한 박판성형공정의 유한요소 역해석) 허지향  2008.01.25 5253
30 Study on the 3-D finite element modeling of fiber reinforced rubber composite using the rebar element (리바요소를 이용한 섬유강화 고무기저 복합재료의 3차원 유한요소 모델링기법 연구) 정세환  2006.08.18 5916