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등급에 따른 한우육의 숙성중 이화학 및 형태학적 특성변화
한기동(G . D . Han),김대곤(D . G . Kim),김수민(S . M . Kim),안동현(D . H . Ahn),성삼경(S . K . Sung) 한국축산학회 1996 한국축산학회지 Vol.38 No.6
This study was conducted to investigate the effects of aging and carcass grade on the physicochemical and morphological properties of rib loin and top round obtained from cows(lst carcass grade), steers(lst carcass grade) and bulls(3rd carcass grade) aged at 2±2℃. Volatile basic nitrogem(VBN), water holding capacity(WHC), cooking loss, myofibrillar fragmentation index(MFI), hardness and morphological changes were observed. The results obtained are summarized as follows; VBN values were increased by the aging, but the differences were not observed with the carcass grade. WHC values of 1st carcass grade beef and rib loin were greater than those of 3rd carcass grade beef and top round, respectively. Cooking loss of lst carcass grade beef was lower that those of 3rd carcass grade beef. Harness of 3rd carcass grade beef was higher than that of 1st carcass grade beef but MFT of 3rd carcass grade beef was lower than that of 1st carcass grade beef, regardless of aging and section. From morphological changes of 3rd carcass grade beef, the disappearance of Z-line and fragmentation of myofibril were found predomintely on the 15th day of aging, while the disappearance of Z-lines of lst carcass grade beef was faster than that of 3rd carcass grade beef was by aging than that of 3rd carcass grade beef.
HCP 재료모델과 파괴모델을 결합한 유한요소해석을 통한 Mg합금 판재 기계적 접합공정 최적화
박효욱(H. W. Park),안동현(D.-H. Ahn),서민홍(M. H. Seo),안강환(K. H. Ahn),김형섭(H. S. Kim) 한국소성가공학회 2012 마그네슘 심포지엄 Vol.2012 No.11
Recently, applications of magnesium alloy products to the automotive and electrical industries gradually become popular due to their excellent physical properties, such as specific strength and specific modulus. However, the constraints of magnesium materials in utilization technologies have become a significant limitation on the applications. In particular, due to the limitation of welding technology, mechanical joining techniques which can replace the popular joining technologies, typically welding, are critically needed. Current levels of the joining technology are insufficient not only in experimental but also in the simulation approaches for mechanical joining. In other words, theoretical and experimental studies about ductile fracture in large deformation are rare and there are hardly reliable results yet. Thus, in other to understand the role of microstructure on the mechanical properties and damage behavior, elaborately numerical researches are required. In this presentation, the finite element method combined with a suitable constitutive model and a fracture model considering limited dislocation slip systems of HCP materials is employed in order to theoretically analyze the mechanical clinching process of magnesium alloy sheet. We could understand the mechanical joining and draw optimization conditions for sound processing and good joining strength.