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RISS 인기검색어
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- 저자 : 이동녕 (검색결과 482 건)
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이동녕,Lee, Dong-Nyeong 한국과학기술단체총연합회 1977 과학과 기술 Vol.10 No.12
이글은 재미과협 회보 Vol.6 No.3에 게재된 이동녕 박사의 글을 옮긴 것이다. 이글은 조국의 기초과학의 침체성을 지적하고 있다. 응용과학에 치중되어 기초과학이 균형을 잃고 있음을 보아온 이박사의 제언에 눈길을 돌려야 할 것이다. 점차 기초과학에 관심을 갖는 이즈음 촉진제가 되리라 믿는다 실은 제 4차 경제개발 5개년 계획에 기초과학육성이 계획되고 있어 위기의식까지는 기우일지 모르나 긴 안목의 과학발전을 위해서는 주목될 만한 글이다.
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주물용 Al-Si 합금중 공정 Si 의 열처리에 의한 구상화
이동녕,신택중 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.10
A study has been made of spheroidization of eutectiferous silicon in the aluminum-silicon cast alloy. AC4C, by annealing under various conditions The spheroidzation could not be achieved by annealing for 27 hours below 400℃, whereas it was achieved relatively easily at temperatures above 500℃. Coarsening of the spheroidized silicon particles was controlled by diffusion. The tensile strength of the specimens increased when annealed at 500 and 550℃ and decreased when annealed at 350 to 450℃, whereas the elongation of all the specimens increased with annealing time.
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이동녕,김형섭 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.1
Density distributions of sintered porous metal with various initial densities during hydrostatic compaction have been calculated using a proposed yield function. The calculation was performed using the iteration method. The caculated results were in very good agreement with experimental ones. The geometric hardening and material strain hardening of the metal were found to have an important effect on the porosity-pressure relation.
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Recrystallization Texture of Cross Rolled 3.3% Si Electrical Steel
이동녕,최현식,한흥남 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.6
The recrystallization texture of cross rolled 3.3% Si electrical steel measured by Hayakawa and Kurasawa can be approximated by the {100}<011> orientation, which is similar to its cross-rolling texture. The result has been discussed based on the strain-energy-release-maximization model, in which, when the absolute max-imum stress directions obtained from the slip systems activated during deformation are crystallographically the same as the minimum Young’s modulus directions, the deformation texture remains unchanged after recrys-tallization. The cross-rolled electrical steel satisfies this criterion.
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스테인리스강-구리-스테인리스강 복합판재의 제조 및 일축 인장거동
이동녕,김동길 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.10
Stainless steel-copper-stainless steel composite sheets have been made by melting copper sandwiched between stainless steel sheets, followed by hot rolling. Effects of the melting time and temperature, and subsequent hot rolling on the mechanical properties of the sandwiched sheets were discussed on the basis of microstructures developed during fabrication. Flow curves or the composite sheets followed the rule of mixture. This was attributed not to the negligible transverse stresses compared to longitudinal stresses in the component layers, but to the fact that an increase in the longitudinal stress due to the tensile transverse stress developed in one component layer while a decrease in the longitudinal stress due to the compressive transverse stress in the other component layer.
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FCC 및 BCC 판재금속의 평면이방성과 집합조직의 관계
이동녕 대한금속재료학회(대한금속학회) 1982 대한금속·재료학회지 Vol.20 No.7
판재의 理想집합조직에 바탕을 두고 집합조직과 소비변형비 및 항복강도의 평면이방성 사이를 관련 맺는 간단한 방법을 제시하였다. 이 방법을 이용하여 fcc금속과 bcc금속의 여러가지 집합조직에 대하여 R값과 항복강도를 인장방향에 따라 계산하였다. 계산값과 측정값사이의 일치는 만족스러웠다. Simple methods for the relationship between the crystallographic texture and planar anisotropy in the plastic strain ratio and the yield strength have been developed on the basis of ideal sheet textures. Calculation of the R value and the yield strength has been made using the methods as a function of tensile directions for various textures in fcc and bcc metals. The agreement between calculated and measured values was satisfactory.
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