지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 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
- 750 - 757 (8page)
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초록· 키워드
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The realistic finite element simulation of sheet metal forming processes necessitates the accurate characterization of plastic behavior of the sheet. For this purpose different experiments and specimen geometries are used in the field of sheet metal characterization to supply information to the increasing number of sophisticated constitutive models demanding many parameters. This work proposes an inverse procedure that reduces the number of needed experiments by utilizing the distribution of strains in the identification of the initial yield locus of sheet metals. The procedure includes the optical measurement of strains on a flat specimen with a varying cross-section. The geometry of the specimen allows obtaining a distribution of strains rather than a uniform deformation. The measured deformation field is compared with the numerical results which use the YLD2000-2D yield criterion and the difference is tried to be minimized in an inverse framework using the Levenberg-Marquardt algorithm. The proposed method is applied to the commercial aluminum alloy AA6016 by varying the specimen orientation with respect to the rolling direction. The results show that the use of the strain distribution in the objective function is a crucial point in identification of the yield locus. The inversely obtained yield loci are in accordance with the conventionally obtained yield stresses and r-values and it is showed that the proposed specimen and the method can successfully characterize the initial anisotropy of the sheet metals in the first quadrant by using one tensile experiment and one layer compression test.
목차
Abstract
INTRODUCTION
MATERIAL MODEL AND ITS IMPLEMENTATION
PROPOSED SPECIMEN AND FINITE ELEMENT MODEL
STRUCTURE OF INVERSE PARAMETER IDENTIFICATION
CHARACTERIZATION OF INITIAL ANISOTROPY
EXPERIMENTAL VERIFICATION
CONCLUSION
REFERENCES
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