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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.
증예보고 : 상악골 LeFort 1 골절단술과 하악골 상행지 수직골절 단술을 이용한 하악골 전돌증환자의 악교정예
박영철(Y. C. Park),기화영(Wha Young Key),양성익(Sung Ik Yang),이의웅(Eui Wung Lee) 대한악안면성형재건외과학회 1985 Maxillofacial Plastic Reconstructive Surgery Vol.7 No.1
In many instances, orthognathic surgical eases require multiple osteotomies in the maxilla and mandible to achieve the most desirable result. When the entire maxilla and mandible are freed from their relationship with the remaining craniofacial complex, accurate repositioning and adequate stabilization can present problems. But, in select cases, with carefu1 treatment p1anniing and meticulous execution of surgical techniques, and optimal postoperative care, the simultaneous of both the maxilla and mandible can be achieved with few adverse sequelae and complications. This is a case of mandibular prognathism including maxillary retrusion of 19 year-old male, which was corrected by simultaneous mobilization, of bath the maxilla and maxilla and postoperative orthodontic treatment.