A damage model for predicting ductile fracture with considering the dependency on stress triaxiality and Lode angle

Ganjiani, Mehdi

doi:10.1016/j.euromechsol.2020.104048

Cited by 22 publications

(4 citation statements)

References 72 publications

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“…To determine the strain-hardening curve, fracture strain, and the corresponding stress triaxiality and Lode angle at the point of damage initiation, a combined experimentalnumerical methodology was employed. The Ganjiani ductile failure model (Ganjiani, 2020) was employed to predict the ductile failure of CuZn30 brass. In this study, it is assumed that damage initiates when the following condition satisfied:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…where ini ε is the equivalent plastic strain at damage initiation. The Ganjiani model (Ganjiani, 2020) describes this strain as: where β and m are the damage coefficient and damage exponent, respectively. The singularity bracket in Eq.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…In contrast, in the coupled scheme, the damage parameter is integrated into both the constitutive equations and the hardening law. Consequently, the softening effect on material behavior can be described more accurately (Šebek et al, 2018;Ganjiani, 2020). Some coupled models also take into account the influence of stress triaxiality and the Lode angle within the yield criterion (Gurson, 1977;Tvergaard and Needleman, 1984;Bai and Wierzbicki, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…A hybrid experimental-numerical approach is employed to establish the strain hardening curve and ductile fracture parameters. The Ganjiani ductile fracture model (Ganjiani, 2020) is utilized to predict the ductile fracture behavior of this material. By implementing the constitutive equations using USDFLD and UHARD subroutines in ABAQUS/Standard, the simulation results are compared with the experiments.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the ductile fracture characteristics of CuZn30 brass under various stress conditions

Ganjiani,

Ghobadi

2024

Preprint

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This paper focuses on the investigation of ductile fracture in CuZn30 brass under various stress triaxialities and Lode angles. To achieve this, five distinct specimen geometries were fabricated, including dog-bone, notched, two types of in-plane shear, and deep drawing specimens. Every specimen was subjected to testing in three orientations: rolling, diagonal, and transverse, with the aim of investigating the potential presence of anisotropic properties in plastic deformation. A non-linear damage parameter was incorporated into the constitutive equations in two forms: coupled and uncoupled from the hardening law. It is assumed that damage progresses as the Ganjiani ductile fracture model, used as a damage initiation criterion, is established. The von-Mises yield criterion characterizes the plastic behavior of the material. In order to authenticate the experimental results, a combination of experimental and numerical simulations was carried out. In this context, all tests were simulated using ABAQUS/Standard through the implementation of USDFLD and UHARD codes. The outcomes of the simulation demonstrated good concordance with the results obtained through experiment, particularly in terms of force and the softening (necking) zone for all specimen types. It was also observed that when damage is considered as a coupled parameter to the hardening law, the softening (necking) phenomenon could be effectively simulated.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessing the ductile fracture characteristics of CuZn30 brass under various stress conditions

Ganjiani,

Ghobadi

2024

Preprint

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Size Effect on the Ductile Fracture of the Aluminium Alloy 2024-T351

Šebek,

Salvet,

Boháč

et al. 2024

Exp Mech

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Background Reliably calibrated criteria are needed for an accurate prediction of fracture of various components. However, there is not always a sufficient amount of material available. Therefore, miniature testing provides an alternative that is researched together with the following calibration of the ductile fracture criteria and investigating the size effect. Objective The aim is to design miniature testing equipment and specimens for tensile testing, which covers various stress states. This is supplemented by the small punch test, which has the same specimen thickness, taken from the literature to broaden the portfolio for calibration. The second part deals with conducting the finite element analysis, which provided a basis for the calibration of the phenomenological ductile fracture criterion applicable to crack-free bodies to indicate the crack initiation. Methods The steel frame to test thin specimens is designed with optical measurement of deformations. The finite element method is used, within Abaqus and user subroutines, to simulate the tests to obtain the variables needed for the calibration. In addition, the calibration of the criterion using machine learning is explored. Results The feasibility of the proposed experimental program is tested on the aluminium alloy 2024-T351. Moreover, the numerical simulations, which showed a good match with experiments in terms of force responses, adds to the knowledge of modelling in the scope of continuum damage mechanics. Conclusions The presented results provide a material basis for the aluminium alloy studied on a lower scale, while they broaden the testing possibilities and analyses the calibration strategies for the best failure predictability possible.

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Influence of plastic anisotropy and stress state on damage evolution and fracture behavior of aluminum 1100

Abedinimanesh

Hazinia

Ganjiani

2022

J Braz. Soc. Mech. Sci. Eng.

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A damage model for predicting ductile fracture with considering the dependency on stress triaxiality and Lode angle

Cited by 22 publications

References 72 publications

Assessing the ductile fracture characteristics of CuZn30 brass under various stress conditions

Assessing the ductile fracture characteristics of CuZn30 brass under various stress conditions

Size Effect on the Ductile Fracture of the Aluminium Alloy 2024-T351

Influence of plastic anisotropy and stress state on damage evolution and fracture behavior of aluminum 1100

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