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Cu 원형관의 2축압축 변형특성 및 조직변화에 관한 연구
유종근(C. K. Yoo),원시태(S. T. Won) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
To examine the deformation characteristics and microstructure formed of round copper pipe under biaxial compression, a horizontal biaxial compression die was fabricated. The change of material properties, punch load and deformation behavior were monitored in experiments using various compressive deformation rates in the range of 0.5㎜/min. ~450㎜/min. The tensile and compressive strains were estimated from Vickers microhardness results. The punch load and deformation characteristic of the round copper pipes were found to change greatly at a deformation rate of about 200 ㎜/min. The punch load decreased with increasing compressive deformation rate. Results of numerical simulation using Deform-2D were in good agreement with experimental results, and the measured hardness variation with the strain variation was predicted well by the simulation.
유종근(C. K. Yoo),원시태(S. T. Won) 한국소성가공학회 2013 금형가공 심포지엄 Vol.2013 No.9
The deformation characteristics of double round copper pipe and single round copper pipe under biaxial compression were studied using a horizontal compression die. The change of punch load and deformation behavior were monitored in experiments using various compressive deformation rates in the range 10mm/min. ~ 450mm/min. The punch load decreased with increasing compressive deformation rate. The results of numerical simulations using Deform-2D were in good agreement with experimental results.
원시태(S.T.Won),유종근(C.K.Yoo),김기주(K.J. Kim) 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
In order to examine the deformation characteristics of Al circular pipe underthe biaxial compression, the horizontal biaxial compression die for the experiment was manufactured. From this, in the various compressive strain rate (1mm/min. ~ 400 mm/min.)conditions, the circular pipes, which were made by Al materials, were investigated based on the properties change of cross section area, punch load and deformation behavior. The tensile and compressive strains were evaluated from micro Vickers hardness tester. From these results, the punch load and deformation characteristic of Al circular pipes were highly changed in the compressive strain rate about 200 mm/min. The Al circular pipes had the tendency that the punch load decreased with increasing the compressive strain rate. In addition, following as the change of the shape and position of neutral axis due to the deformation proceeding of the circular pipe, the special point of the internal circular pipe at maximum load showed the maximum deformation strain and the maximum measured hardness value. The CAE (computer aided engineering) simulation using Deform-2D program was performed on the circular pipe in order to know and verify the exact compressive deformation behavior. From these results, the experimentally measured results were reasonably in good agreement with the simulation results.