Forming severity concept for predicting sheet necking under complex loading histories

Bai, Yuanli; Wierzbicki, Tomasz

doi:10.1016/j.ijmecsci.2008.02.010

Cited by 56 publications

(12 citation statements)

References 25 publications

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“…Where  defined by equation ( 6) is the normalized third deviatoric stress invariant of the stress tensor and m  is the mean stress (for more details see [5][6][7][8][9][10][11]…”

Section: Transformation Of Conventional Fld Into the Stress State Space Under Plane Stressmentioning

confidence: 99%

Sheet necking prediction in forming limit diagrams with the anisotropy influence incorporation

Farahnak

Prantl

Džugan

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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A well-known method of materials formability description is the Forming Limit Diagram (FLD). In FLDs/FLC (Forming Limit Curve) a plot of major and minor principal strains in the plane of deformed sheet where necking takes place is represented. The current paper is dealing with anisotropy influence on FLC. This effect is going to be studied with the use of mild steel DC01. Hills anisotropic criterion is considered here and for its application experimental investigation has to be carried out in order to provide input data for the model applied. Uniaxial tensile tests were performed for basic characterisation of sheet samples with the use of contact-less measuring devices. In order to assess the anisotropy experimentally, the specimens were extracted and tested in Rolling Direction (RD), Transverse Direction (TD) and 45° Skew Direction (SD) for the Lankford ratios determination. Detailed stress state description of the material investigated was carried out with the use the stress triaxiality and Lode angle parameter. Therefore, transformations from conventional space into stress state provide a profound insight into the necking phenomenon. According to the experimental and numerical results it was found that it is necessary to take anisotropy effects into account for the material investigated.Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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“…Where  defined by equation ( 6) is the normalized third deviatoric stress invariant of the stress tensor and m  is the mean stress (for more details see [5][6][7][8][9][10][11]…”

Section: Transformation Of Conventional Fld Into the Stress State Space Under Plane Stressmentioning

confidence: 99%

Sheet necking prediction in forming limit diagrams with the anisotropy influence incorporation

Farahnak

Prantl

Džugan

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…(44)) to the mixed strain and stress invariants 3D space used in the present paper, a curtain plastic flow rule should be assumed to link the strain ratio to stress ratio. Such a procedure can be found in Ref [4]. On the contrary, ductile fracture models can also be converted to the FFLD space for comparison, which will be summarized in Section 6.2.…”

Section: Fracture Forming Limit Diagram (Ffld)mentioning

confidence: 99%

A comparative study of three groups of ductile fracture loci in the 3D space

Bai

Wierzbicki

2015

Engineering Fracture Mechanics

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162

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“…Inherent in the generation and the use of the strain-based FLD is the realisation of the strong interdependence of material response on the strain path and the absence of a unique FLD under complex or non-proportional loading conditions [32]. Nonetheless complex loading paths were investigated by Muschenborn and Sonne [33] where they proposed to link the equivalent plastic strains with the deformation path through the transforming of the FLD from major-minor strain space to the space of equivalent plastic strain, …”

Section: Evaluation Of Foam Sandwich Panels Through Fe Modellingmentioning

confidence: 99%

Response of thin-skinned sandwich panels to contact loading with flat-ended cylindrical punches: Experiments, numerical simulations and neutron diffraction measurements

Saleh

Luzin

Toppler

et al. 2015

Composites Part B: Engineering

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Forming severity concept for predicting sheet necking under complex loading histories

Cited by 56 publications

References 25 publications

Sheet necking prediction in forming limit diagrams with the anisotropy influence incorporation

Sheet necking prediction in forming limit diagrams with the anisotropy influence incorporation

A comparative study of three groups of ductile fracture loci in the 3D space

Response of thin-skinned sandwich panels to contact loading with flat-ended cylindrical punches: Experiments, numerical simulations and neutron diffraction measurements

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