Influence of transverse normal stress on sheet metal formability

Smith, L. M.; Averill, Ronald C.; Lucas, J.; Stoughton, Thomas B.; Matin, Payam

doi:10.1016/s0749-6419(02)00035-9

Cited by 87 publications

(38 citation statements)

References 17 publications

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“…Besides, increasing the compressive normal stress causes to move the entire FLD to the right. This result has agreement with the results of Assempour et al 1 and Smith et al 20 (e.g., for different materials). Figure 10 shows the FLD and major and minor strain values extracted from the FEM for T-joint tube that modeled for an internal pressure 40 MPa.…”

Section: Resultssupporting

confidence: 93%

“…Most of these works applied the plane stress assumption. Some literature [18][19][20][21][22] showed necking in tube hydroforming could occur at locations where, in addition to the in-plane stresses, a through thickness compressive stress acts, and therefore the plane stress assumption is not appropriate for tube hydroforming especially for thicker parts. However, the aim of the present study is to present some examples of using the developed model (i.e., FLD of tubular hydroformed parts considering the through-thickness compressive normal stress) in tube hydroforming process.…”

Section: Introductionmentioning

confidence: 99%

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Forming limit diagram of tubular hydroformed parts considering the through-thickness compressive normal stress

Hashemi

Abrinia

Assempour

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, the effect of a compressive normal stress has been considered in the determination of forming limit diagrams and forming limit stress diagrams to predict neck initiation failure in tube hydroforming of T-shaped parts. Computation of the forming limit diagrams and FLSDs is based on the generalized Marciniak and Kuczynski method to consider the existence of through-thickness compressive normal stress. The proposed forming limit diagrams and FLSDs were used in conjunction with ABAQUS/EXPLICIT finite element simulations to predict the onset of necking in tube hydroforming of T-shaped part. The amount of calibration pressure and axial feeding required to produce an acceptable part in finite element method was compared to published experimental data, and a satisfactory agreement between the FEM and test results has been achieved. Therefore, the present approach can be used as a reliable criterion to design tube hydroforming processes and reduce the number of costly trials.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Forming limit diagram of tubular hydroformed parts considering the through-thickness compressive normal stress

Hashemi

Abrinia

Assempour

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…An analysis of sheet failure under normal pressure without assuming ductile damage has been done in the last period. Such an analysis was performed by using Swift-Hill models by Gotoh [107], Smith [252] and Matin [207]. Recently, Banabic and Soare [28], Wu et al [298] and Alwood and Shouler [4] have analyzed independently the influence of the normal pressure on the Forming Limit Curve using an enhanced MK model.…”

Section: Implementation Of the Ductile Damage Modelsmentioning

confidence: 99%

Advances in anisotropy and formability

et al. 2010

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This paper presents synthetically the most recent models for description of the anisotropic plastic behavior. The first section gives an overview of the classical models. Further, the discussion is focused on the anisotropic formulations developed on the basis of the theories of linear transformations and tensor representations, respectively. Those models are applied to different types of materials: body centered, faced centered and hexagonalclose packed metals. A brief review of the experimental methods used for characterizing and modeling the anisotropic plastic behavior of metallic sheets and tubes under biaxial loading is presented together with the models and methods developed for predicting and establishing the limit strains. The capabilities of some commercial programs specially designed for the computation of forming limit curves (FLC) are also analyzed.

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“…The common FLC is measured at the condition of plane stress (absence of contact stress), but the effect of contact stress on the FLC has been the subject of several investigations. Smith has developed an analytical model that predicts the effect of contact stress on the position and shape of the FLC (Smith et al, 2005). In his paper he compares his result to those obtained by Gotoh et al (1995) and has found a significant discrepancy in the magnitude of the effect.…”

Section: Principlementioning

confidence: 99%

An overview of stabilizing deformation mechanisms in incremental sheet forming

Emmens

Boogaard

2009

Journal of Materials Processing Technology

246

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In Incremental Sheet Forming (ISF) strains can be obtained well above the Forming Limit Curve (FLC) that is applicable to common sheet forming operations like deep drawing and stretching. This paper presents an overview of mechanisms that have been suggested to explain the enhanced formability. The difference between fracture limit and necking limit in sheet metal forming is discussed. The necking limit represents a localized geometrical instability. Localized deformation is an essential characteristic of ISF and proposed mechanisms should stabilize the localization before it leads to fracture. In literature six mechanisms are mentioned in relation to ISF: contact stress; bending-under tension; shear; cyclic straining; geometrical inability to grow and hydrostatic stress. The first three are able to localize deformation and all but the last, are found to be able to postpone unstable growth of a neck. Hydrostatic pressure may influence the final failure, but cannot explain stability above the FLC.

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Influence of transverse normal stress on sheet metal formability

Cited by 87 publications

References 17 publications

Forming limit diagram of tubular hydroformed parts considering the through-thickness compressive normal stress

Forming limit diagram of tubular hydroformed parts considering the through-thickness compressive normal stress

Advances in anisotropy and formability

An overview of stabilizing deformation mechanisms in incremental sheet forming

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