Evaluation of bendability of sheet metals using void coalescence models

Ragab, Ahmed; Saleh, Ch.A.R.

doi:10.1016/j.msea.2004.12.011

Cited by 32 publications

(23 citation statements)

References 14 publications

(28 reference statements)

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“…Sarkar et al, [7,8] in agreement with Datsko and Yang, [1] have shown that an increasing amount of constituent iron-rich particles not only influences the bendability of an alloy, but also the tensile ductility. Ragab and Saleh [9] and Bettaieb et al [10,11] took into account void growth and coalescence in modeling of bendability. Constituent particles in metals are found to be natural nucleation sites for microvoids.…”

Section: Introductionmentioning

confidence: 99%

Three-Point Bending of Heat-Treatable Aluminum Alloys: Influence of Microstructure and Texture on Bendability and Fracture Behavior

Westermann

Snilsberg

Sharifi

et al. 2011

Metall Mater Trans A

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Section: Introductionmentioning

confidence: 99%

Three-Point Bending of Heat-Treatable Aluminum Alloys: Influence of Microstructure and Texture on Bendability and Fracture Behavior

Westermann

Snilsberg

Sharifi

et al. 2011

Metall Mater Trans A

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“…5. In this figure, the bend allowance is the bending length at the neutral axis, which remains constant during bending and after spring back [20].…”

Section: The Tmb Concept and Selected Materialsmentioning

confidence: 99%

Experimental and numerical analysis of a beam made of adhesively bonded tailor-made blanks

Monaco

Sinke

Benedictus

2008

Int J Adv Manuf Technol

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For aircraft structures, it is clear that the design and the selection of materials play an important role in the performance of the aircraft. The production costs are also important. The concept of tailor-made blanks (TMBs) is based on the use of dedicated blanks, made of different alloys and/or thickness in order to satisfy different demands such as an increase, if necessary, of local strength, stiffness, and damage tolerance. This paper describes the results of a study to assess the potential weight and cost savings of using TMBs in a typical aerospace structure. A bonded structure representing the floor beam of an aircraft has been selected, analyzed, and tested to validate the numerical and analytical predictions made with MATLAB and finite-element method. The results show weight reduction of 12% and 37% for two studied configurations, compared to the reference beam.

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“…[18] An extension to include anisotropy of the matrix material of the voided solid is presented by Ragab and Saleh. [19,20] Orthotropic anisotropy as introduced by Hill [21] is adopted here such that the macroscopic effective stress in terms of the principal stresses ( 1 , 2 , 3 ) is given by [1] where…”

Section: A Constitutive Laws For Anisotropic Voided Solidsmentioning

confidence: 99%

“…Combining Eq. [1] with a simplified form of the GursonTvergaard yield function [18,19,20] gives the effective matrix stress as [2] where f is the void volume fraction and the mean stress m ϭ ( 1 ϩ 2 ϩ 3 )/3. According to several works as listed in the article by Ragab, [23] the semiempirical parameters q 1 and q 2 , previously adopted by Tvergaard, [18] are selected to be q 1 ϭ 2 and q 2 ϭ 1.…”

Section: A Constitutive Laws For Anisotropic Voided Solidsmentioning

confidence: 99%

“…Contact e-mail: a.r.ragab@link.net Manuscript submitted April 6, 2005. model deals with the materials as being initially defected with voids nucleated at inclusions. The analysis is thus based on a Gurson-Tvergaard yield function [18] for voided solids, which is modified [19,20] to include Hill's model of orthotropic anisotropy, [21] a factor that is largely overlooked in most analyses. The limit strains are generally predicted at the onset of formation of shear bands within the ligaments joining growing voids of spheroidal shapes according to a condition given by McClintock.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An approach to predict free surface fracture in bulk forming

Ragab

2006

Metall Mater Trans A

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This work presents a unified approach to predict surface strains at failure in bulk forming processes. The approach does not deal with a specific process but rather with prescribed strain and stress paths. The material to be processed is assumed to possess an initial void volume fraction that grows and coalesces with straining, ending by fracture. The predictions are based on a formulation for voided solids according to the Gurson-Tvergaard yield function adapted to include orthotropic anisotropy. The incident of fracture is characterized by shear band formation within the ligaments of the matrix material among spheroidal voids as described by McClintock. The results are represented by a straight line plot of tensile limit strain versus the compressive strain for different loading paths. These limit curves are shown to be dependent on the initial void fraction, hardening, and anisotropy of the matrix material. Alloys with lower initial void fractions as well as those of higher hardening show better workability. The model is applied to predict bulk formability curves for steels AISI 1040 and 1045, Aluminum Al 7075-T6, and copper, based on the proper selection of micromechanical parameters for these alloys. The validity of the model is ensured through fairly favorable comparison with experimentally determined limit curves. The current failure conditions are suitable to predict the experimental dual slope fracture line that may exist for some alloys such as cold-drawn steel AISI 1045 and aluminum 2024-T6 by considering two mechanisms of failure: internal necking in the ligament material between voids, followed by transition to shear band formation.

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Evaluation of bendability of sheet metals using void coalescence models

Cited by 32 publications

References 14 publications

Three-Point Bending of Heat-Treatable Aluminum Alloys: Influence of Microstructure and Texture on Bendability and Fracture Behavior

Three-Point Bending of Heat-Treatable Aluminum Alloys: Influence of Microstructure and Texture on Bendability and Fracture Behavior

Experimental and numerical analysis of a beam made of adhesively bonded tailor-made blanks

An approach to predict free surface fracture in bulk forming

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