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박신희(S.H.Park),강신유(S.Y.Kang),김헌영(H.Y.Kim),민동균(D.K.Min),한동철(D.C.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Nonlinear spring element was imported into explicit finite element program for vehicle crash analyses. Axial-crush and bending-collapse of the box beam were expressed by nonlinear spring element in combination with Belytschko beam element, using axial crush and bending collapse theories. Some verifications were compared with those of commercial finite element code, PAMCRASH. Shell models and nonlinear spring models for box beams were analyzed for axial crush and bending collapse and the results of the latter were on good accordance with those of the former.<br/>
박신희(S.H.Park),강신유(S.Y.Kang),김헌영(H.Y.Kim),한동철(D.C.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
An explicit finite element program is developed for vehicle crashworthiness, which is based on the explicit time integration, updated Lagrange formulation and master-slave contact algorithm. The new program contains Belytschko-Tsay shell and modified shell with shear projection method, nonlinear spring with 4 degrees of freedom, and higher order hyperelastic rubber material, etc. Frontal crashes and quasi-static door intrusion and dynamic side impact of passenger car are analyzed by using the program. Hybrid models by nonlinear spring, beam and shell elements are used to analyze the frontal crash of the passenger car and the results are compared to those of full car model. Side impact strength of impact bar is analyzed. The results are compared with and have good agreements with those of commercial finite element codes, LS/DYNA3D and PAMCRASH.
[안전/타이어운동특성부문] 경사하중을 받는 정사각 박판부재의 붕괴 거동
박제승(J.S.Park),박신희(S.H.Park),한동철(D.C.Han) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The crush behavior of a square column subjected to oblique loads. which is undergoing both axial and bending collapses. is analyzed. Oblique load conditions in numerical simulations are realized by means of impacting the column on a declined rigid wall with no friction. Mean crush loads corresponding to load angles are investigated with such geometrical parameters as thickness. width and length. Results show that there is a critical load angle in which a transition takes place from axial collapse mode to bending collapse mode. And then the dimensionless mean crush load is employed from normalizing the mean crush load with analytical axial mean crush load and bending moment equations. It is expressed as the function of only one variable. the load angle. Finally. the formulation for the mean crush load is developed in terms of geometrical parameters and the critical load angle
김홍욱(H.W.Kim),박신희(S.H.Park),강신유(S.Y.Kang),한동철(D.C.Han),김정원(J.W.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In substitution of beam-nonlinear spring model for real-car, it may have errors due to complicated characteristics of joint and overestimation of joints stiffness. In this research, a method for the joint modeling was suggested by nonlinear static and dynamic analyses of beam and shell joint models and verified by the application of accomplished joint modeling method to fullcar beam-nonlinear spring model. In consequence, modified beam-nonlinear spring model was improved in local acceleration and rigid wall force.<br/>