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이찬주(C.J. Lee),김재영(J.Y. Kim),이상곤(S.K. Lee),고대철(D.C. Ko),H. Schafer,김병민(B.M. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The purpose of this study is investigating the joint characteristics of advanced high strength steel DP780 and Al5052 alloy sheet in the clinching process. It is difficult to join the advanced high strength with light-weight materials like aluminum alloy, because of low formability of DP780. The defects of clinching joint such as necking of the upper sheet, cracks of the lower sheet and no interlocking were occurred by different ductility between advanced high strength steel and aluminum alloy. The clinching conditions should be optimized to interlock without andy defects. In this study, the effect of process parameters of clinching process on joinability of advanced high strength steel with Al5052 alloy was investigated by using FE-analysis. From the result of FE-analysis, the clearance between clinching punch and die, die depth and the shape of die cavity mainly affected the joinability of advanced high strength steel with Al5052 alloy.
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),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.