An extended GTN model for indentation-induced damage

Chen, Youbin; Zhang, Chunyu; Varé, Christophe

doi:10.1016/j.commatsci.2016.11.043

Cited by 19 publications

(5 citation statements)

References 22 publications

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“…where q 1 , q 3 , q 4 are empirical constants, K D is an empirical damage rate coefficient, f is the void volume fraction, D shear is damage associated with void shearing, g θ accounts for the azimuthal dependence on an octahedral plane, ε eq is the equivalent strain. The same approach was used by Youbin Chen et al [13], where they studied the damage induced by spherical indentation deformation by using a modified GTN model. Jin et al [14] established a modified GTN model that incorporates thermal cycling effect into the evolution of void-damage to investigate the damage mechanism of 5A06 aluminum alloy welded joint subjected to thermal cycling.…”

Section: Empirical Curve Fitting Models For Metals 21 Gurson-tvergaar...mentioning

confidence: 99%

A Review of Damage, Void Evolution, and Fatigue Life Prediction Models

Lee

Basaran

2021

Metals

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Degradation, damage evolution, and fatigue models in the literature for various engineering materials, mostly metals and composites, are reviewed. For empirical models established under the framework of Newtonian mechanics, Gurson–Tvergaard–Needleman (GTN) type model, Johnson-Cook (J-C) type damage model, microplasticity model, some other micro-mechanism based damage models, and models using irreversible entropy as a metric with an empirical evolution function are thoroughly discussed. For Physics-based models, the development and applications of unified mechanics theory is reviewed.

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Section: Empirical Curve Fitting Models For Metals 21 Gurson-tvergaar...mentioning

confidence: 99%

A Review of Damage, Void Evolution, and Fatigue Life Prediction Models

Lee

Basaran

2021

Metals

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“…Recently, Chen et al [27] extended the GTN model by considering the effects of nucleation of shear softening and localization due to existing voids, and successfully applied the extension to conduct an indentation damage simulation. Although the GTN model has been extensively developed, it is difficult to predict ductile fractures accurately under multi-stress triaxiality in micro-scaled progressive forming processes, as the model does not consider shear damage and its size effect.…”

Section: Introductionmentioning

confidence: 99%

Ductile fracture behavior in micro-scaled progressive forming of Magnesium-Lithium alloy sheet

Wang

Xiao²,

Wang³

et al. 2022

Preprint

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Micro-scaled progressive sheet metal forming is a promising process for producing bulk microparts, given itsadvantages of high efficiency and low cost. To enhance forming quality andefficiency, it is important to have an in-depth understanding of the forming mechanism andmodel the forming process and fracture behavior accurately. However, prediction of fracture formation in sheet materials at the micro scale has not yet been well explored, and thus current knowledgeis not sufficient to support the continued development and application of microforming technology. This study investigated progressive sheet forming of magnesium–lithium alloy sheets of different grain sizes to produce bulk microparts directly from sheet metal via shearing, extruding, piercing, and blanking. Using the Gurson–Tvergaard–Needleman (GTN) damage model, the effects of the size factor on the formation and evolution of voids were considered, and the shear-modified GTN model was established by combining Thomason’s and Lemaitre's damage mechanics models. The modified model could predict not only the ductile fracture behavior dominated by tension under high stress triaxiality at the micro scale, but also the damage behavior controlled by shear deformation under low stress triaxiality. The progressive forming process was simulated using the modified model, which was verified by experimentation and simulation. Comparisons of the experiments and simulations revealed the size effects on the forming defects and fracture behaviors of microparts during progressive sheet forming. The results show that the stress during deformation is mainly concentrated at the edge of mircoparts, and irregular geometric defects include burr, rollover, incline, and bulge become deteriorated with the increase of the initial grain size. This study enhances the understanding and prediction of ductile fracture in the micro-scaled progressive forming of sheet metals.

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“…without identification of hardening laws in the same processes of GTN parameters determination. Recently, many works [24][25][26] are devoted to identify simultaneously GTN model and hardening laws parameters. Other interesting works of [27 and 28] consist to link the micro-scale to the macro-scale by studying the crack propagation using the GTN model and then determining the R-curves for cracked specimens.…”

Section: Introductionmentioning

confidence: 99%

Coupled identification of the hardening behavior laws and Gurson–Tvergaard–Needleman damage parameters - Validation on tear test of 12NiCr6 CT specimen

Miloud

Zidane

Mendas

2019

Frattura Ed Integrità Strutturale

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This work is devoted to the application of the micromechanical Gurson-Tvergaard-Needleman (GTN) model to study the ductile tearing of 12NiCr6 steel. GTN model is widely used to describe the three stages of ductile tearing: nucleation, growth and the coalescence of micro-voids. A new approach based on the identification of the GTN damage model coupled or not with hardening laws using inverse analysis. After identification, the obtained results show a good agreement between the experimental curve tensile test of an axisymetric notched bar (AN2) and those numerically obtained for GTN model coupled with the hardening laws. In order to validate the identified GTN parameters, a simulation of tear test is conducted on 12 NiCr6 steel CT specimen. The numerical results are compared with experimental results found in the literature and a good agreement is obtained. This identification procedure is more accurate than when the damage parameters are identified independently of the hardening laws.

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An extended GTN model for indentation-induced damage

Cited by 19 publications

References 22 publications

A Review of Damage, Void Evolution, and Fatigue Life Prediction Models

A Review of Damage, Void Evolution, and Fatigue Life Prediction Models

Ductile fracture behavior in micro-scaled progressive forming of Magnesium-Lithium alloy sheet

Coupled identification of the hardening behavior laws and Gurson–Tvergaard–Needleman damage parameters - Validation on tear test of 12NiCr6 CT specimen

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