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논문 기본 정보

자료유형
학술대회자료
저자정보
Y. Xu (Chinese Academy of Sciences) H.W. Song (Chinese Academy of Sciences) S.H. Zhang (Chinese Academy of Sciences) M. Cheng (Chinese Academy of Sciences)
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
461 - 468 (8page)

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The demand for weight reduction in modern vehicle construction has resulted in an increase in the application of hydroforming processes for the manufacture of automotive lightweight components. This trend led to the research of evaluation on formability of the sheet or tube hydroforming to be noted, particularly the prediction of fracture. In this study, a new proposed approach based on damage theory for fracture prediction considering the deformation history was introduced. And the modified ductile fracture criterion was applied to predict the failure for hydraulic bulging of AISI 304 austenitic steel sheets. The material parameters in terms of the function of strain rate in the failure criterion were determined from the equivalent fracture strains corresponding tensile tests under different stress conditions. Then, in the finite element simulation the effect of strain rates and their distribution as well during practical sheet metal forming process was considered. The hydraulic bulging tests were carried out to identify the fracture behavior predicted from FE analysis. A comparison between the prediction and experimental results showed that the proposed approach with a modified ductile fracture criteria can give better fracture predictions than traditional ways.

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Abstract
INTRODUCTION
NEW APPORACH FOR FRACTURE PREDICITON WITH A MODIFIED DUCTILE
MATERIALS AND RELATED PARAMETERS
FAILURE PREDICTION IN SHEET HYDRAULIC BULGING
CONCLUSIONS
REFERENCES

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