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정윤철(Yoon-Chul Jung),박정수(Jung-Soo Park),신형섭(Hyung-Seop Shin),최광(Kwang Choi) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, the friction stir spot welding of Mg-alloy sheets has been tried using an apparatus devised with CNC milling machine to give a precise control of the friction time and the plunge depth. The shape and volume of the protrusion formed depending on the probe shape and plunge depth were investigated. The history of temperature distribution the related variation of vertical load applied to specimen during welding by using an Infrared Thermal Imager(THERMA CAM™ SC2000) and loadcell located below the fixture of specimen respectively. In order to characterize the friction stir spot welding of Mg alloy sheets, the micrographic observation has been done. Tensile shear test is also performed to evaluate the fracture force of the welded specimen.
강유석(Y.S. Kang),서오석(O. S. Seo),문형일(H. I. Moon),김헌영(Heon Young Kim),이명규(M. G. Lee),김지훈(J. H. Kim),김대용(D. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
Recently, Mg alloy sheet has been used widely in the field of automotive and electronic industries because of its lightweight. e.q. However, some difficulties exists in characterizing the material, poor formability and abnormal stress-strain behavior. In this pater, a new cyclic tension-compression tester is developed for characterization of constitutive equation and failure behaviors of Mg alloy sheet. The horizontal type tester range of temperature(R.T.~400℃). It using the laser extensometer was installed and operated in an indirect way. The apparatus was used to evaluate the stress-strain relation under tension-compression loading. Temperature distribution in the specimen is also investigated Mg alloy sheets for stress-strain and temperature distribution of specimen.
서오석(Oh Suk Seo),김헌영(Heon Young Kim),이명규(Myoung-Gyu Lee),김지훈(Ji Hoon Kim),김대용(Dae Yong Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Recently, lightweight material has been used widely in the field of automotive and electronic industries. However, some difficulties exists in characterizing the material, poor formability and abnormal stress-strain behavior such as Mg alloy sheet. In this paper, a new cyclic load tester, which can measure the stress-strain curves of thin sheet metals under non-monotonous condition such as tension /compression or compression /tension, was developed. Material tests including tension / compression/ tension or compression/tension/compression test are performed to aluminum and magnesium alloy sheets and construct a database of its material properties.
이충안(Chung An Lee),서오석(Oh Suk Seo),이명규(Myoung Guy Lee),김지훈(Ji Hoon kim),김대용(Dae Young Kim),김헌용(Heon Young Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
Recently, lightweight material has been used widely in the field of automotive and electronic industries. However, some difficults exists in characterizing the material, poor formability and abnormal stress-strain behavior such as Mg alloy sheet. In this paper, a new cyclid load tester, which can measure the stress-strain curves of thin sheet metals under non-monotonous condition such as tension /compression or compression /tension, was debeloped. Material tests including tension / compression / tension or compression/tension/compression test are performed to aluminum and magnesium alloy sheets and construct a database of its material properties.