An assessment of isotropic constitutive models for ductile fracture under high and low stress triaxiality

Malcher, L.; Pires, F.M. Andrade; Sá, J. M. A. César de

doi:10.1016/j.ijplas.2011.10.005

Cited by 146 publications

(68 citation statements)

References 46 publications

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“…Localization is nonetheless a different aspect of the deformation. Malcher et al (2012) showed that (in general) the GTN model does not accurately predicts the fracture strain, but it behaves relatively well under high and low triaxialities for the prediction of the force level and the displacement at fracture. Fig.…”

Section: Analysis Of Fracture Prediction By the Gurson Modelmentioning

confidence: 97%

Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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Single point incremental forming (SPIF) has several advantages over traditional forming, such as the high formability attainable by the material. Different hypotheses have been proposed to explain this behavior, but there is still no straightforward relation between the particular stress and strain state induced by SPIF and the material degradation leading to localization and fracture. A systematic review of the state of the art about formability and damage in SPIF is presented and an extended Gurson-TvergaardNeedleman (GTN) model was applied to predict damage in SPIF through finite element (FE) simulations. The line test was used to validate the simulations by comparing force and shape predictions with experimental results. To analyze the failure prediction, several simulations of SPIF cones at different wall angles were performed. It is concluded that the GTN model underestimates the failure angle on SPIF due to wrong coalescence modeling. A physically-based Thomason coalescence criterion was then used leading to an improvement on the results by delaying the onset of coalescence.

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Section: Analysis Of Fracture Prediction By the Gurson Modelmentioning

confidence: 97%

Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

View full text Add to dashboard Cite

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“…The use of tensile tests on smooth specimens, to simultaneously calibrate the hardening and damage parameters, is insufficient to predict ductile rupture of the material over a wide stress triaxiality range [32]. Consequently, the material parameters are determined using three tests: (1) uniaxial tensile tests on smooth specimens (2) uniaxial tensile tests on notched specimen (R = 20 mm) and (3) shear tests.…”

Section: Identification Of Materials Parametersmentioning

confidence: 99%

Experimental characterization and numerical modeling of micromechanical damage under different stress states

et al. 2013

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The use of HSLA steels for the manufacture of automotive components is interesting from an engineering point of view. This family of steels, while possessing high strength, also has good formability and can be used in forming manufacturing processes. In some forming processes such as blanking, shear strain localization occurs, which causes damage and results in the final fracture of the material. This paper presents an experimental study based on in situ tests to understand and identify the physical mechanisms of ductile damage under two stress states: tension and shear. Different macroscopic tests were performed to calibrate a damage model based on a micromechanical approach. This damage model is based on the Gurson-Tvergaard-Needleman theory and presents recent improvements proposed by Nahshon and Hutchinson and by Nielsen and Tvergaard so as to better predict fracture under a wide range of stress states, especially with low levels of stress triaxiality. These extensions have made the identification of the material parameter more complicated. In this work an identification strategy has been proposed using tests on specimens with different shapes. The identified parameter values are validated and the fracture model show good predictive capability over a wide stress state range.

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“…It is known that to cover the range of the relation between stress triaxiality and strain at failure, namely on low stress triaxiality states, other failure models are needed [18,19] and therefore they will be tested in future studies.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of ductile failure models in Sheet Metal Forming

et al. 2016

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Abstract. Traditionally, combination of equivalent plastic strain and stress triaxiality parameters are taken into account when performing characterization of material ductility. Some well-established models like Lemaitre model, GTN based models and many others perform relatively well at high-triaxiality stress states but fail to give adequate answers to low-triaxiality states. In this work, three damage models are presented, applied and assessed to a crossshaped component. Concerning material, AA5182-O, corresponding damage parameters are characterized by an inverse analysis procedure for each damage model.

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An assessment of isotropic constitutive models for ductile fracture under high and low stress triaxiality

Cited by 146 publications

References 46 publications

Damage prediction in single point incremental forming using an extended Gurson model

Damage prediction in single point incremental forming using an extended Gurson model

Experimental characterization and numerical modeling of micromechanical damage under different stress states

Evaluation of ductile failure models in Sheet Metal Forming

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