Formability analysis of pre-strained AA5754-O sheet metal using Yld96 plasticity theory: Role of amount and direction of uni-axial pre-strain

Dhara, Sisir; Basak, Shamik; Panda, Sushanta Kumar; Hazra, S. K.; Shollock, Barbara A.; Dashwood, R. J.

doi:10.1016/j.jmapro.2016.09.014

Cited by 38 publications

(4 citation statements)

References 37 publications

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“…Both R-values and yield stress values were assessed at strain values corresponding to 50% of the uniform elongation value of that particular metal. 28 Therefore, the R-values were assessed at approximately 5% strain for DP980 and at 15% strain for IFHS. This is done to average out the evolution in anisotropic properties with an increase in plastic deformation.…”

Section: Materials Modellingmentioning

confidence: 99%

Application of non-associated flow rule for prediction of nonuniform material flow during deep drawing of tailor welded blanks

Bandyopadhyay

Basak

Panda

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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In order to enhance FE prediction capability, researchers are presently showing interest in applications of non-associated flow rule (NAFR) coupled with Hill48 quadratic function in different sheet metal forming operations. In this work, the concept of NAFR based model was implemented for the first time in FE simulation of deep drawing of DP980-IFHS tailor welded blanks (TWBs) of coated and uncoated sheets. The NAFR model was formulated using two approaches: namely, stress-value based Hill48 as yield function and R-value based Hill48 as the plastic potential function in the first approach, and the vice-versa in the second approach. Also, the classical associated flow rule (AFR) based approach coupled with the anisotropic Hill48 yield model was implemented in the FE simulation for comparison purpose. For improving the prediction accuracy, a mixed hardening equation by combining Voce and Swift hardening law was incorporated as the constitutive equation. It was found that FE simulation implementing the NAFR approach predicted the deep drawing behaviour of the parent materials and TWBs more accurately compared to that of the AFR approach.

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Section: Materials Modellingmentioning

confidence: 99%

Application of non-associated flow rule for prediction of nonuniform material flow during deep drawing of tailor welded blanks

Bandyopadhyay

Basak

Panda

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The current state-of-the-art has focussed on the effects of the discontinuous strain path change on material forming limit. Dhara et al [1] simulated the discontinuous strain path change in an AA5754-O aluminium alloy by first pre-strained in uniaxially in a tensile machine and subsequently re-loading along the biaxial strain path using a miniature Nakajima test. They found considerable increase in the forming limits when the material was prestrained along transverse to the sheet rolling direction.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel testing methodology for in-situ microstructural characterisation during continuous strain path change

Dhara

Taylor

Figiel

et al. 2022

Materials Characterization

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“…On aluminum alloys, Graf [8] studied the effect of the changing strain path on forming limit diagrams of 2008-T4 samples and observed different effects on the FLD for three different prestrains: biaxial, uniaxial tension and plane strain. Dhara [9] used uniaxial tension on the RD and TD as the prestrain in the FLD of AA5754-O material, and found a shift in the FLD depending on the amount and direction of uniaxial prestrain. The FLC increases in the left-hand side, and decreases in the right-hand side of the diagram under a prestrain along the transverse direction (TD) or rolling direction (RD).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Prestrain on the Formability of Zn-Cu-Ti Alloy Zinc Sheet

Nicoletti

Roatta

Marinelli

et al. 2022

Metals

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The forming limit diagrams (FLDs) characterizing the formability of sheet metals are usually obtained by applying proportional loadings. Nevertheless, the industrial processes involve strain path changes that can modify the limit-strain values. In addition, for strongly anisotropic sheet metals such as the Zn-Cu-Ti zinc alloy, large differences in forming limit curves (FLCs) with respect to the sheet rolling direction are observed. In the present work, the analysis of the effect of bilinear strain paths on the FLC is addressed by both experimental measurements and numerical simulations. For this purpose, a miniature testing device was used that allows evaluation of the influence of strain path changes on the limit strain on samples at 0°, 45° and 90° with respect to the sheet rolling direction cut from non-standard large samples previously subjected to a prestrain along the RD up to an early deformation of ~0.12. Numerical simulations were carried out using the well-known Marciniak and Kuczynski (MK) theory in conjunction with the viscoplastic self-consistent (VPSC) crystal plasticity model. In order to account for the grain fragmentation process due to the continuous dynamic recrystallization (CDRX) mechanism, an ad hoc short-range interaction effect (SRE) model was included in the simulations. Additionally, the measured and simulated texture evolution of Zn-Cu-Ti alloy sheets at the different stages of the deformations were shown. The capacity of the MK-VPSC-SRE model was validated, and the limitations to simulating the texture development, flow stress and forming limit curves, including a non-proportional strain path, were discussed.

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Formability analysis of pre-strained AA5754-O sheet metal using Yld96 plasticity theory: Role of amount and direction of uni-axial pre-strain

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 38 publications

References 37 publications

Application of non-associated flow rule for prediction of nonuniform material flow during deep drawing of tailor welded blanks

Application of non-associated flow rule for prediction of nonuniform material flow during deep drawing of tailor welded blanks

Development of a novel testing methodology for in-situ microstructural characterisation during continuous strain path change

Experimental and Numerical Analysis of Prestrain on the Formability of Zn-Cu-Ti Alloy Zinc Sheet

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