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TiNi/Al 형상기억 지적복합재료의 기계적 특성 및 강화기구
박영철,윤두표,이규창,Park, Yeong-Cheol,Yun, Du-Pyo,Lee, Gyu-Chang,Huruya, Y. 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
In the present paper, it is attempted to reconfirm the "Intelligent" material properties using both the sintered TiNi/Al(1100) matrix composite made by powder metallurgy method and the squeeze-casted TiNi/Al6061 specimens. A metal matrix composite is, its fault has been considered to deteriorate a strength of composite by heating residual stress of the matrix. Therefore, it is necessary to remove a tensile residual stress, to produce the strength of a composite better. On the contrary, if compressive residual stress happens in matrix of composite in place of tensile residual stress, it will make the strength of composite better. So that, this paper introduce the development of a high strength of composite, by using compressive residual stress well, on the study. By using these specimens, shape memory strengthening effects in tensile strength and fatigue crack propagation above inverse transformation temperature of TiNi fiber were investigated. We occurs the prestrain and volume fraction for to discuss the effects of a composite strength. Moreover, by SEM observation, the effect of the residual stress at the interface between Al matrix and TiNi fiber and some brittle precipitation layers such as inter metallic compounds on fracture mechanisms was discussed metallurgically.urgically.
형상기억복합재료에 있어서 형상기억효과에 의한 피로균열전파특성에 관한 연구
박영철(Y.C.Park),윤두표(D.P.Yun),신인수(I.S.Sin),이준희(J.H.Lee),김순국(S.K.Kim),이규창(G.C.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this study. It is introduced that TiNi/Al shape memory composite as one of new material that used shape memory alloy(SMA). It is a method to produce a better strength of composite by occurring compressive residual stress in matrix. Using shape memory effect of TiNi fiber. The shape memory composites are made by powder metallurgy. Moreover. TiNiCo/Al composite is made by using TiNiCo alloy as fiber. And it is discussed the properties of fatigue crack propagation in the shape memory composite. <br/> The results of fatigue test of a shape memory composite. The fatigue strength of a shape memory composite increase in proportion to adding of wolume fraction of TiNi(Co) fiber at 363K. This fiber reinforced effect is related to the increase of volume fraction and pre-strain.<br/>
FRONT SUSPENSION의 LOWER ARM에 대한 최적설계
박영철(Y. C. Park),윤두표(D. P. Yun),강재욱(J. W. Kang),배명호(M. H. Bae),진두병(D. B. Jin),이범재(B. J. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
LOWER ARM which jointed Independant Front Suspension is resulted in stress distribution analysis by using Finite Element Method. These datas represented in the condition of 8 loads and 3- type- section (I, H and H+I) type. On the basis of it, It is optimized shape and dimension of LOWER ARM. The optimized performance shows that the H type of 3 types has an available strength and H' section, which proved by H type, finds safety factor and yield strength in each case of load condition.<br/> <br/>