Phenomenological uncoupled ductile fracture model considering different void deformation modes for sheet metal forming

Mu, Lin; Zang, Yong; Wang, Yuan; Li, Xiayu; Stemler, Pedro Malaquias Araújo

doi:10.1016/j.ijmecsci.2018.04.025

Cited by 77 publications

(15 citation statements)

References 69 publications

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“…The combined model predicts the global force-displacement behavior much more accurately than the other two models. It should be emphasized that the reliability of the obtained global force and displacement response is strongly correlated with the reliability of the FE simulation [20].…”

Section: Stress-strain Behavior Of High Silicon Steelmentioning

confidence: 91%

“…As the stress state varied within a small range during the plastic deformation of each specimen, the averaged stress triaxiality, η avg = 1 ε f ε f 0 η(ε)dε , and the averaged Lode angle parameter, θ avg = 1 ε f ε f 0 θ(ε)dε , were utilized to determine the parameters η, θ [20]. In this study, the element removing method [47,48] is used to simulate crack growth.…”

Section: D Fracture Locusmentioning

confidence: 99%

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Numerical Analysis of Edge Cracking in High-Silicon Steel during Cold Rolling with 3D Fracture Locus

2021

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In this study, a 3D fracture locus of high-silicon steel strip was constructed through a series of fracture tests with specimens of various shapes and corresponding finite element (FE) simulations of the fracture tests. A series of FE analyses coupled with the developed fracture locus was conducted, and the effect of the secondary roll-bending ratio (defined as L2/R2, where L2 and R2, respectively, denote the secondary work roll barrel length and the radius of the convex curvature of the work roll surface profile emulating positive roll bending) and the initial notch length on edge cracking in the strip during cold rolling was investigated. The results reveal that the 2D fracture locus that does not include the Lode angle parameter (varying between −0.81 and 0.72 during cold rolling) overestimates the edge cracking in the range of 13.1–22.2%. The effect of the initial notch length on the length of crack grown in the transverse direction of the strip during cold rolling is greatest when the ratio L2/R2 is 0.12.

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Section: Stress-strain Behavior Of High Silicon Steelmentioning

confidence: 91%

Section: D Fracture Locusmentioning

confidence: 99%

Numerical Analysis of Edge Cracking in High-Silicon Steel during Cold Rolling with 3D Fracture Locus

2021

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“…Lou and Yoon [15] extended a stress-invariant-based function to model fracture limits of sheet metals. Mu et al [16] developed a mathematical model of ductile fracture behavior by considering two major void deformation modes and calibrated the model for DP780 using a hybrid experimental-numerical method. On the one hand, all the above research are to investigate the ductile fracture behavior of sheet metals under different stress triaxiality, which can accurately characterize the deformation behavior of sheet metal under complex stress state.…”

Section: Introductionmentioning

confidence: 99%

Failure Modeling for QP980 Steel by a Shear Ductile Fracture Criterion

Wang

Liu³

et al. 2022

Metals

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The wide application of advanced high strength steels with high specific strength in the automotive industry can significantly reduce energy consumption and contribute to carbon neutrality. Accurate prediction of the ductile fracture behavior of advanced high strength steels under complex stress states is of great significance for its application in automobile industry. In this study, the ductile fracture behavior of QP980 under complex stress states, covering shear, uniaxial tension, and plane strain tension, is investigated by conducting the hybrid experiment and simulation. The pressure-coupled Drucker yield function is chosen to characterize the effect of stress states on yielding for QP980, considering its high accuracy compared with the von Mises yield function. Failure limit of the stress states is modelled by five uncoupled ductile fracture criteria (Brozzo, Oh, Rice-Tracey, Ko-Huh, and DF2012). To improve the numerical prediction accuracy, the parameters of the constitutive model are optimized by using the inverse engineering approach. The numerical predicted results are compared with the experimental load-stroke curves with the onset of fracture. The comparison indicates that the prediction error of the DF2012 criterion is significantly lower than those of the other four criteria. In addition, the prediction accuracy is greatly improved with the parameters of the constitutive model optimized by the inverse engineering.

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“…The model could well predict the fracture strain of AA2024-T351, Al 6061-T6, ASTM A572, and AISI 1045 materials in a wide range of stress triaxiality. Mu et al (2018) combined void dilation and void elongation/ rotation modes with a strain-based nonlinear void nucleation function. The prediction deviation was acceptable under different stress states.…”

Section: Introductionmentioning

confidence: 99%

A new ductile fracture criterion considering both shear and tension mechanisms on void coalescence

Yang

Ju.

2020

International Journal of Damage Mechanics

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A new ductile fracture criterion is proposed based on three stages of ductile fracture: void nucleation, growth and coalescence from the microscopic viewpoint. Based on the observation of SEM fracture surfaces of AA2024-T351 aluminum alloy sheet and bar samples under different stress states, it is assumed that the void aggregation is controlled by shear or shear-tension fracture mechanism according to the stress state. And the stress triaxiality is deemed as the only influence factor for controlling the void growth. The new ductile fracture criterion applied to a wide range of stress triaxiality is built. By fitting the available testing data of AA2024-T351 aluminum alloy and AISI 1045 steel, the fracture loci in the stress triaxiality, Lode parameter and equivalent fracture strain space ([Formula: see text]) built by the new criterion are compared with those by DF2014, Hu criterion, modified Mohr-Coulomb criterion (MMC) and Hosford- Coulomb (H-C) criterion. The fitting results prove better prediction accuracy for the new criterion. To further compare the stability of these criteria, the fracture loci in the space of ([Formula: see text]) for AA2024-T351 alloy are established by only fitting five tests. The new criterion can still well predict the equivalent fracture strain ([Formula: see text]). Compared with DF2014, Hu criterion, MMC and H-C criterion, the average errors of the new criterion are reduced by 26.72%, 20.07%, 31.78% and 34.62%, respectively. Furthermore, the maximum errors are reduced by 49.62%, 27.31%, 33.76% and 29.91%, separately. Therefore, the new fracture criterion has higher prediction accuracy and better prediction stability. Last but certainly not least, the new criterion can predict more accurately under high stress triaxiality conditions.

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Phenomenological uncoupled ductile fracture model considering different void deformation modes for sheet metal forming

Cited by 77 publications

References 69 publications

Numerical Analysis of Edge Cracking in High-Silicon Steel during Cold Rolling with 3D Fracture Locus

Numerical Analysis of Edge Cracking in High-Silicon Steel during Cold Rolling with 3D Fracture Locus

Failure Modeling for QP980 Steel by a Shear Ductile Fracture Criterion

A new ductile fracture criterion considering both shear and tension mechanisms on void coalescence

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