A new model of metal plasticity and fracture with pressure and Lode dependence

Bai, Yuanli; Wierzbicki, Tomasz

doi:10.1016/j.ijplas.2007.09.004

Cited by 1,451 publications

(725 citation statements)

References 38 publications

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“…However, the simulations clearly over-predicted the stress for both the tensile tests on notched specimens and the shear test. This over-prediction was also observed by Bai and Wierzbicki [14], who stated that a possible explanation could be hydrostatic stress sensitivity in the material. Indeed, the hardening law parameters in this study are calibrated from a smooth tensile test.…”

Section: Validation Of Simulationssupporting

confidence: 80%

On the fracture locus of AA7075-T651

Fourmeau

Benallal

Hopperstad³

2010

EPJ Web of Conferences

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Abstract. The overall goal of this work-in-progress is to try to establish the fracture locus (i.e. the equivalent strain to fracture as a function of the stress triaxiality factor) for the high-strength AA7075-T651 aluminium alloy. Experiments on several specimen geometries enabled us to reach stress triaxialities in the range from ı* = 0 for shear tests to ı* = 1.4 for notched specimen tensile tests. For shear tests, failure occurred by strong strain localization. However, local stresses and strains can not be deduced directly from these tests. Consequently, Digital Image Correlation (DIC) was used to extract the local strain fields to failure. In parallel, numerical simulations of the tests were run using the non-linear finite element code LS-DYNA to extract the evolution of the local stress triaxiality during straining. Based on a combination of both experimental and numerical data, the failure locus of the material can be constructed.

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Section: Validation Of Simulationssupporting

confidence: 80%

On the fracture locus of AA7075-T651

Fourmeau

Benallal

Hopperstad³

2010

EPJ Web of Conferences

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show abstract

“…Hence, the EFFECTIVE DAMAGE CONCEPT [8] by OHATA and TOYODA which is applicable in case of ultra-low-cycle fatigue (ULCF) during earthquakes is highly relevant. An innovative damage concept proposed by BAI and WIERZBICKI [6] who designed a spatial fracture locus characterising material resistance by means of critical plastic strains depending on stress triaxiality and on the LODE angle provides extension. In comparison to conventional two parameter criterions, a higher accuracy of evaluating stress states with nominal and shear stresses is achieved by additionally considering the third invariant of the deviatoric stress tensor.…”

Section: Damage Mechanics Approachmentioning

confidence: 99%

“…In comparison to conventional two parameter criterions, a higher accuracy of evaluating stress states with nominal and shear stresses is achieved by additionally considering the third invariant of the deviatoric stress tensor. [6] For the purpose of a realistic prediction of material damage behaviour and component failure a hybrid plasticity and damage model is applied.…”

Section: Damage Mechanics Approachmentioning

confidence: 99%

“…In the present model, the influence of the third invariant of the deviatoric stress tensor is taken into account by the damage concept of BAI and WIERZBICKI [6], which is described by equation (2). (2) The parameters C1, C2, C3 and C4 are material parameters calibrated from small scale tests.…”

Section: Damage Mechanics Modelmentioning

confidence: 99%

“…By incorporating the Lode angle into the damage concept, BAI and WIERZBICKI enhanced common two-parameter criterions in terms of 2D damage curve to a 3D damage initiation locus. [6] …”

Section: Damage Mechanics Modelmentioning

confidence: 99%

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