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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/>
TiNi 가 섬유가 TiNi (Co)/Al 형상기억복합재료의 피로균열전파에 미치는 영향
박영철,윤두표,김순국,이준희,이규창 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.5
In this paper, TiNiCo/Al shape memory composites were fabricated by powder metallurgy method. TiNi and TiNiCo were used as fiber for reinforcement. To investigate the fatigue crack propagation behavior due to the compressive residual stress which exists in the composites, fatigue test was performed at room temperature and above the inverse transformation temperature A_f of TiNi and TiNiCo shape memory alloy. Results are as follows; At 363 K, both composites have lower fatigue crack propagation rate than pure matrix in the same ΔK area and the fatigue crack propagation of TiNi/Al composite is lower than that of TiNiCo/Al composite.