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논문 기본 정보

자료유형
학술대회자료
저자정보
Meng Luo (Massachusetts Institute of Technology) Gilles Rousselier (MINES ParisTech) Dirk Mohr (Massachusetts Institute of Technology)
저널정보
한국소성·가공학회 기타자료 The 8th International Conference and Workshop on numerical simulation of 3D seet metal forming processes (NUMISHEET 2011)
발행연도
2011.8
수록면
351 - 359 (9page)

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초록· 키워드

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A recently developed Reduced Texture Methodology (RTM) featuring (ⅰ) a significantly reduced number of crystallographic orientations, (ⅱ) a special experiment-based parameter calibration procedure, and (ⅲ) reasonable computational time for industrial applications is adopted to model the anisotropic plastic behavior of a 2㎜-thick extruded aluminum 6260-T6 sheet. Firstly, the full-thickness sheet is modeled with twelve crystallographic orientations, and the model parameters are identified through an optimization procedure based on uniaxial tensile tests with seven different material orientations. The calibrated model describes well the stress-strain curves and Lankford ratios for all directions, while the optimized grain orientations are in good agreement with EBSD measurements. However, the EBSD results also reveal that the present sheet exhibits a strong heterogeneity through the thickness as far as crystallographic orientations and grain sizes are concerned. To account for this heterogeneity, eight grain orientations are selected out of the total twelve for the full-thickness sheet to model the 0.7㎜-thick central layer of the sheet based on the EBSD measurements. It is found that the reduced eight-grain model provides good predictions of the macroscopic responses in uniaxial tensile tests on reduced-thickness specimens, even without further calibration. A combined calibration is also performed to determine the final set of parameters which provide excellent modeling for both the full-thickness sheet (twelve-grain model) and its central layer (eight-grain model).

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Abstract
INTRODUCTION
POLYCRYSTALLINE PLASTICITY MODELING
EXPERIMENTAL PROGRAM
MODEL CALIBRATION AND DISCUSSIONS
SUMMARY
REFERENCES

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