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논문 기본 정보

자료유형
학술대회자료
저자정보
Abel D. Santos (University of Porto) Pedro Teixeira (INEGI – Institute of Mechanical Engineering and Industrial Management) A. Barata da Rocha (University of Porto) F. Barlat (Pohang University of Science and Technology)
저널정보
한국소성·가공학회 기타자료 NUMIFORM 2010
발행연도
2010.6
수록면
845 - 852 (8page)

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The standard uniaxial tensile test is a widely accepted method to obtain relevant properties of sheet metal materials. These fundamental parameters can be used in numerical modeling of sheet forming operations to predict and assess formability and failure analysis. However the range of strain obtained from tensile test is limited and therefore if one will need further information on material behavior, extrapolation of tensile data is performed. The bulge test is an alternative to obtain ranges of deformation higher than tensile test, thus being possible to obtain non-extrapolated data for material behavior. Several methods may be used to obtain stress-strain data from bulge test, but a common concept is behind them, which needs the measurement of bulge pressure, curvature of bulge specimen, its thickness at the pole and the application of membrane theory. Concerning such measurements, optical methods are being used recently but classical mechanical methods are still an alternative with its own strengths. This paper presents the use and development of a mechanical measuring system to be incorporated in a hydraulic bulge test for flow curve determination, which permits real-time data acquisition under controlled strain rates up to high levels of plastic deformation. Numerical simulations of bulge test using FEM are performed and a sensitivity analysis is done for some influencing variables used in measurements, thus giving some directions in the design and use of the experimental mechanical system. Also, first experimental results are presented, showing an efficient testing procedure method for real time data acquisition with a stable evaluation of the flow curve.

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Abstract
INTRODUCTION
THEORY FOR STRESS AND STRAIN MEASUREMENT
NUMERICAL MODELLING
EXPERIMENTAL RESULTS
CONCLUSIONS AND PERSPECTIVES
REFERENCES

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UCI(KEPA) : I410-ECN-0101-2014-550-003326534