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이찬주(C.J. Lee),이상진(S.J. Lee),이상곤(S.K. Lee),이정민(J.M. Lee),김병민(B.M. Kim) 한국소성가공학회 2011 압출 및 인발 심포지엄 Vol.2011 No.8
The purpose of this study is to design multi-stage shape-drawing process for linear guide rail. The number of pass in multi-stage shape-drawing process was determined by capacity of drawing machine and shape-drawing force. The shape-drawing force was calculated by the section division method. The section shape of intermediate die was determined by equi-potential line in electric field analysis. The equivalent reduction ratio of area was employed to determine the section area of intermediate die. The FE-analysis and forming experiment were conducted to verify the multi-stage shape-drawing process designed by the proposed method. The shape-drawing forces in FE-analysis and experiment had a good agreement with prediction by the section division method. Un-filling rate of final product was less than about 1% of total section area.
이지영(J Y Lee),권용일(Y I Kwon),박태철(T C Park),이은정(E J Lee),권동진(D J Kwon),김찬주(C J Kim),이근호(K H Lee),서상용(S Y Seo),조형권(H G Cho),류진희(J H Ryu),나순숙(S S Na),이진우(J W Lee),김수평(S P Kim) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.10
A case of rapidly grown, huge ovarian cyst in an 18-year old woman is presented with a brief review of literature. This tumor was measured 30x40x45 cm in size, and weighed 13kg. The pathologic diagnosis was mucinous cystadenoma, left ovary.
Cohesive zone model을 이용한 접착제 물성평가 : 모드 Ⅰ
이찬주(C.J. Lee),이상곤(S.K. Lee),고대철(D.C. Ko),S. Marzi,박근환(G.H. Park),김병민(B.M. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Fracture models and criteria of adhesive with two parameters, namely G<SUB>C</SUB> and σ<SUB>max</SUB>, have been developed to describe the fracture process of adhesive joints. Cohesive zone model(CZM) is a representative two parameter failure criteria approach. In CZM, σ<SUB>max</SUB> is a critical, limiting maximum value of the stress in the damage zone ahead of the crack and is assumed to have some physical significance in adhesive failure. Based on CZM and finite element analysis method, the relationship between fracture load and adhesive properties, as G<SUB>IC</SUB> and(σ<SUB>max</SUB>)<SUB>I</SUB>, was investigated in adhesively bonded joint tensile test and T-peel test. The two parameters in tensile mode loading were evaluated by using the relationship. The value of G<SUB>IC</SUB> evaluated by proposed method showed close agreement with analytical solution for tapered double cantilever beam(TDCB) test which proposed in an ASTM standard.
이찬주(C.J Lee),이정민(J.M. Lee),이경수(K.S Lee),김병민(B.M. Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nano-indentation test is well-known method widely used to measure mechanical properties of bulk material such as elastic modulus and hardness. To evaluate the behavior of bulk material during the nano-indentation test, many theoretical models were proposed. However, because of complicated the nonlinear elastic-plastic behavior of bulk material, it is very difficult to identify the properties of bulk material using theoretical model. In this paper, the behavior of bulk materal is numerically calculated by FE analysis and through dimensionless analysis, it is identified that the relationship between the properties of bulk materials and characters of loading-unloading curve obtained by nano-indentation test. Using this relationship, the properties of bulk material were extracted from nano-indentation curve. To verify reliability of properties compared loading-unloading curves obtained by nano-indentation test and FE analysis.