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조진래,하대율,Jo, Jin-Rae,Ha, Dae-Yul 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
Functionally graded materials(FGMs) are highlighted to be suitable for high temperature engineering due to their continuous distribution of material properties. In this paper, an optimal design is executed for determining the optimal material volume distribution pattern that minimizes the steady-state thermal stress of FGM heat-resisting composites. The interior penalty function method and the golden section method are employed as optimization techniques while the finite element method is used for thermal stress analysis. Through numerical simulations we suggest the volume fraction distributions that considerably improve initial thermal stress distributions.
공리적 설계를 이용한 모니터용 EPS 완충 포장 설계 시스템 개발
이정욱(Jeong-Wook Yi),하대율(Dae-Yul Ha),이상우(Sang-Woo Lee),임재문(Jae-Moon Lim),박경진(Gyung-Jin Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The monitor product is packed by cushioning materials because the monitor can be broken during<br/> transportation. However, the addition of the cushioning material increased the volume of the product.<br/> Therefore, it is required that the usage of cushioning material be minimized. In practice, design engineers<br/> have followed the ad hoc design with experiences of predecessors. Automation of the design process is very<br/> important for the reduction of engineering cost, and can be achieved by an excellent design process and<br/> software development. A design flow is defined and a software system is developed for automated design.<br/> At first, a basic model is defined. A user can modify the model from menus and design is carried out<br/> according to the input from the user. Finite element models are automatically generated based on the design.<br/> A nonlinear finite element analysis program called LS/DYNA3D is linked for the impact analysis. The<br/> process of Design of Experiments using orthogonal array is installed to minimize the maximum acceleration<br/> in drop test. Therefore, a new design can be proposed by the system. The program is designed according<br/> to the Independence Axiom of Axiomatic design. FRs and DPs of the software system are defined and<br/> decomposed by zigzagging process. Independent modules can be generated by analysis of the full design<br/> matrix and each module is coded as class in Object Oriented Programming (OOP). Design results are<br/> discussed.
김진성(Jin Sung Kim),허훈(Hoon Huh),이강욱(Kang Wook Lee),하대율(Dae Yul Ha),여태정(Tae Jung Yeo),박순조(Soon Jo Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This paper deals with dynamic tensile characteristics for the polypropylene used in an IP(Instrument Panel). The dynamic tensile characteristics are important because the PAB module undergoes high speed deformation during the airbag expansion. The dynamic tensile tests are performed at the low temperature(30℃), room temperature(21℃) and high temperature(85℃). The tensile tests are carried out at strain rates of six intervals ranged from 0.001/sec to 100/sec. Tensile tests of polymers are rather tricky since polymer does not elongate uniformly right after the onset of yielding unlike the conventional steel. A new method is suggested to get the stress-strain curve accurately. The optimization method produced a good stress-strain curves which is in good coincidence with the stress-strain curve obtained from the experiment.