Calibration of Ductile Fracture Criterion with Optimal Experiment Design and Prediction on Forming Limit for Aluminum Alloy Sheet

Lirong Sun; Zhongyi Cai; Jiaxin Gao; Mingwei Wang; Li Li

doi:10.1007/s12540-021-00970-3

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자료유형: 학술저널

저자정보: Lirong Sun (Jilin University) Zhongyi Cai (Jilin University) Jiaxin Gao (Jilin University) Mingwei Wang (Jilin University) Li Li (Jilin University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.4

발행연도: 2022.4

수록면: 848 - 861 (14page)

DOI: 10.1007/s12540-021-00970-3

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This paper is concerned with accurate prediction on the fracture strain and fracture forming limit curve (FFLC) by calibratingthe material constants by the specimens with reasonable shapes and sizes. The Lou?Huh ductile fracture criteria (DFC)in analytic and integral forms were adopted, and the theoretical formulas in various stress states were derived. The processand basis for calibrating the material constants of DFC by hybrid experimental?numerical method were described in detail. Moreover, the material constants calculated by different test groups including the uniaxial tensile, plane strain and shearspecimens with different shapes and sizes vary enormously, and the optimal test group was determined to calibrate the materialconstant of DFC. Meanwhile, it can be found that the different material constants greatly impact on the magnitude andshape of the fracture strain and FFLC, and the effect of each material constant on the fracture strain and FFLC was analyzedand compared in this paper. Finally, the FFLCs theoretically calculated by DFC in analytic and integral forms were verifiedby the experimental forming limiting data of the bulge test.

#Ductile fracture criterion · Material constant · Fracture strain · Fracture forming limit curve · Aluminum alloy sheet

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