Evolution of the plastic anisotropy with straining and its implication on formability for sheet metals

An, Yongling; Vegter, H.; Melzer, Stefan; Triguero, Patricia Romano

doi:10.1016/j.jmatprotec.2013.02.008

Cited by 40 publications

(12 citation statements)

References 18 publications

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“…Normal anisotropy ( r ¯ mean ) of the sheets is 0.7, which may have strong effect on the formability of the sheet at different loading conditions. 22 Forming behavior of this material at different directions (RD, ID and TD) was studied using the LDH test. A minimum of 10 points over the crack region were used for calculating minor and major strains.…”

Section: Resultsmentioning

confidence: 99%

Effect of plastic anisotropy on forming behavior of AA-6061 aluminum alloy sheet

Barnwal

Tewari

Narasimhan

et al. 2016

The Journal of Strain Analysis for Engineering Design

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AA-6061 (T6) aluminum alloy sheet is used extensively for structural applications in various automotive and aerospace industries due to its excellent mechanical and physical properties. Due to lower formability of this material in agehardened (T6) condition, forming of complex-shaped components is a major challenge. Forming behavior of the sheet was studied in T6 condition using limit dome height tests by experiment and finite element method for three different sheet directions (rolling direction, inclined direction (ID) and transverse direction). Strain path diagrams were obtained from the experimental limit dome height tests and finite element method simulations from drawing to stretching region, and the results were compared for all the sheet directions. Forming limit diagrams were plotted using strain localization and fracture criteria from experimental and simulated strain path curves. Effect of plastic anisotropy on crack propagation direction was studied using finite element method, and it has been found that the direction of crack propagation was strongly dependent on plastic anisotropy ratio (''r'' value) of the sheet in biaxial strain paths.

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Section: Resultsmentioning

confidence: 99%

Effect of plastic anisotropy on forming behavior of AA-6061 aluminum alloy sheet

Barnwal

Tewari

Narasimhan

et al. 2016

The Journal of Strain Analysis for Engineering Design

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“…The true plastic strain along the elongation direction, i.e. length, is calculated according to equation (5) [12]:…”

Section: P Post-pr Ost-process F Ocess For Data E or Data Ev Valuation Aluationmentioning

confidence: 99%

Anisotropic Plastic Behavior of Additively Manufactured PH1 Steel

Liu¹,

Li²,

Bossuyt

et al. 2021

Esaform 2021

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Metals made by additive manufacturing (AM) have intensely augmented over the past decade for customizing complex structured products in the aerospace industry, automotive, and biomedical engineering. However, for AM fabricated steels, the correlation between the microstructure and mechanical properties is yet a challenging task with limited reports. To realize optimization and material design during the AM process, it is imperative to understand the influence of the microstructural features on the mechanical properties of AM fabricated steels. In the present study, three material blocks with 120×25×15 mm3 dimensions are produced from PH1 steel powder using powder bed fusion (PBF) technology to investigate the anisotropic plastic deformation behavior arising from the manufacturing process. Despite being identical in geometrical shape, the manufactured blocks are designed distinguishingly with various coordinate transformations, i.e. alternating the orientation of the block in the building direction (z) and the substrate plate (x, y). Uniaxial tensile tests are performed along the length direction of each specimen to characterize the anisotropic plastic deformation behavior. The distinctly anisotropic plasticity behavior in terms of strength and ductility are observed in the AM PH1 steel, which is explained by their varied microstructure affected by the thermal history of blocks. It could also be revealed that the thermal history in the AM blocks is influenced by the block geometry even though the same process parameters are employed.

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“…In addition, uniform size change of the orthotropic yield function in the stress space is controlled by single scalar hardening variable and mostly flow stress curve for the rolling direction is adopted as the expansion rule. However, some recent experimental studies report alternation of the yield stress ratios and/or instantaneous r-values with evolution of sheet texture during deformation process (Zamiri and Pourboghrat, 2007;An et al, 2013;Safaei et al, 2014). Furthermore, numerous studies related to the application of the orthotropic plasticity formulations with constant anisotropy parameters in predicting complex forming processes indicate that possible model improvements could be achieved by incorporating the evolution of yield stress ratios and r-values into the model.…”

Section: Latin American Journal Of Solids and Structures 14 (2017) 18mentioning

confidence: 99%

Algorithmic Formulations of Evolutionary Anisotropic Plasticity Models Based on Non-Associated Flow Rule

Cvitanić

Kovačić

2017

Lat. Am. j. solids struct.

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Evolution of the plastic anisotropy with straining and its implication on formability for sheet metals

Cited by 40 publications

References 18 publications

Effect of plastic anisotropy on forming behavior of AA-6061 aluminum alloy sheet

Effect of plastic anisotropy on forming behavior of AA-6061 aluminum alloy sheet

Anisotropic Plastic Behavior of Additively Manufactured PH1 Steel

Algorithmic Formulations of Evolutionary Anisotropic Plasticity Models Based on Non-Associated Flow Rule

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