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티타늄 합금판재(Ti-6Al-4V)의 고온 소성변형특성(1)
박진기(J. G. Park),김정한(J. H. Kim),박노광(N. K. Park),김영석(Y. S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Titanium alloy sheets have excellent specific strength and corrosion resistance as well as good performance at high temperature. Recently, titanium alloys are widely employed not only aerospace parts but also bio prothesis and motorcycle However, due to the low formability and large spring back at room temperature, titanium alloy sheets were usually formed by slow forming or hot forming with heating die and specimen. in the sheet metal forming area, FE simulation technique to optimize forming process is widely used. To achieve high accuracy FE simulation results, Identification of material properties and deformation characteristic such as yield function are very important. In this study, uniaxial tensile and biaxial tensile test of Ti-6Al-4V alloy sheet with thickness of 1.0mm were performed at elevated temperature of 873K. Biaxial tensile tests with cruciform specimen were performed until the specimen was breakdown to characterize the yield locus of Ti-6Al-4V alloy sheet. The experimental results for yield locus are compared with the theoretical predictions based on Von Mises, Hill, Logan-Hosford, and Balat’s model. Among these Logan-Hosford’s yield criterion well predicts the experimental results.
티타늄 합금판재(Ti-6Al-4V)의 온간 소성변형특성(2)
박진기(J. G. Park),박노광(N. K. Park),김영석(Y. S. Kim),J. H. Kim 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Titanium alloy sheets have excellent specific strength and corrosion resistance as well as good performance at high temperature. Recently, titanium alloys are widely employed not only aerospace parts but also bio prothesis and motorcycle However, due to the low formability and large spring back at room temperature, titanium alloy sheets were usually formed by slow forming or hot forming with heating die and specimen. In the sheet metal forming area, FE simulation technique to optimize forming process is widely used. To achieve high accuracy FE simulation results, Identification of material properties and deformation characteristic such as yield function are very important. In this study, uniaxial tensile of Ti-6Al-4V alloy sheet with thickness of 1.0㎜ were performed at elevated temperature of 400℃~600℃. Also, uniaxial compression tests with special jig were performed characterize the yield locus of Ti-6AI-4V alloy sheet at 600℃. The experimental results for yield locus are compared with new yield function which was proposed in this study. The new yield function can describe not only the anisotropic of material but also asymmetry behavior between tension and compression.