Formability prediction of Ti6Al4V titanium alloy sheet deformed at room temperature and 600 °C

Bressan, José Divo; Wang, Qiaoling; Simonetto, Enrico; Ghiotti, Andrea; Bruschi, Stefania

doi:10.1007/s12289-020-01546-z

Cited by 8 publications

(7 citation statements)

References 46 publications

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“…In many cases, the actual orthotropic yield criterion (i.e., this criterion describes experimental data with sufficient accuracy) is replaced with the assumption of normal anisotropy [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The effect of this replacement on the final result is unknown.…”

Section: Statement Of the Problemmentioning

confidence: 99%

“…The solution of Equations (20) and (22) supplies the dependencies of ϕ c and ρ c on p. Then, the radial distribution of the stresses σ r and σ θ at a given value of p immediately follows from Equations (18) and (19).…”

Section: Of 16mentioning

confidence: 99%

“…in the case of Yield Criterion (6). The radial and circumferential stresses on the right-hand side of Equation (26) should be eliminated using Equations (15) and 16, on the right-hand side of Equation (27) using Equations (18) and (19). The solutions (26) and (27) are valid if the respective yield criterion is not violated in the range a ≤ ρ ≤ 1.…”

Section: Of 16mentioning

confidence: 99%

“…The third equation in (18) shows that ϕ is independent of the time. Therefore, Equation (43) can be immediately integrated to give…”

Section: Strain Solutionmentioning

confidence: 99%

“…A non-linear correlation between the hole expansion ratio and tensile properties, including the coefficient of normal anisotropy, has been revealed in [14,15]. Many instability (or failure) criteria used for predicting the limit strain and formability of sheet metal are applicable only for normal anisotropy [16][17][18]. In [19][20][21], the influence of plastic anisotropy on the plastic behavior and failure of porous ductile materials has been studied using different modifications of the Gurson yield criterion.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of the Replacement of the Actual Plastic Orthotropy with Various Approximations of Normal Anisotropy on Residual Stresses and Strains in a Thin Disk Subjected to External Pressure

et al. 2020

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Plastic anisotropy is very common to metallic materials. This property may significantly affect the performance of structures. However, the actual orthotropic yield criterion is often replaced with a criterion based on the assumption of normal anisotropy. The present paper aims to reveal the influence of this replacement on the distribution of strains and residual strains in a thin hollow disk under plane stress conditions. The boundary-value problem is intentionally formulated such that it is possible to obtain an exact semi-analytical solution without relaxing the boundary conditions. It is assumed that the disk is loaded by external pressure, followed by elastic unloading. The comparative analysis of the distributions of residual strains shows a significant deviation of the distribution resulting from the solutions based on the assumption of normal anisotropy from the distribution found using the actual orthotropic yield criterion. This finding shows that replacing the actual orthotropic yield criterion with the assumption of normal anisotropy may result in very inaccurate predictions. The type of anisotropy accepted is of practical importance because it usually results from such processes as drawing end extrusion with an axis of symmetry.

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Section: Statement Of the Problemmentioning

confidence: 99%

Section: Of 16mentioning

confidence: 99%

Section: Of 16mentioning

confidence: 99%

“…The third equation in (18) shows that ϕ is independent of the time. Therefore, Equation (43) can be immediately integrated to give…”

Section: Strain Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the Replacement of the Actual Plastic Orthotropy with Various Approximations of Normal Anisotropy on Residual Stresses and Strains in a Thin Disk Subjected to External Pressure

et al. 2020

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Numerical and experimental analysis of edge wave defect control during TA2 circular tube cold roll forming

Yue,

Zhang,

Xiao

et al. 2024

Engineering Reports

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The increasing application of TA2 titanium profiles in marine and petrochemical industries has spurred in a growing demand for diverse forms, including U‐shaped, rectangular, and tubular thin‐walled profiles. Traditional methods like mechanical subtractive processing and extrusion, despite their prevalence, suffer from high production costs and low efficiency. As a metal sheet forming technology, roll forming stands out for its efficiency, accuracy, and capability of producing complex shapes continuously. Nevertheless, the application of cold rolling to TA2 profiles is challenging primarily due to its low elastic modulus and high yield strength. In view of this, this study employed finite element simulation to analyze the stress and strain distribution during the TA2 roll forming process, aiming to have a better understanding of edge wave defect formation mechanism. Orthogonal experiments were performed to assess the influence of frame spacing, forming speed, roll gap, and downhill amount, on edge wave defects. The findings revealed a predominant influence of the downhill amount. Maintaining the downhill volume at 0.6 times the tube diameter kept the longitudinal strain below 0.9%, effectively mitigating edge wave defects. Implementation of these optimized parameters in an actual TA2 roll forming process confirmed the reliability of the simulations. This study establishes a solid foundation for advancing the TA2 tube cold roll forming process, enhancing the production efficiency of titanium profiles, and shedding some light on current energy conservation and emission reduction.

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Ductility Improvement in Commercially Pure Aluminium by Friction Stir Processing

Jha¹,

Alam²,

Chakraborty

et al. 2021

Springer Proceedings in Materials

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Formability prediction of Ti6Al4V titanium alloy sheet deformed at room temperature and 600 °C

Cited by 8 publications

References 46 publications

Influence of the Replacement of the Actual Plastic Orthotropy with Various Approximations of Normal Anisotropy on Residual Stresses and Strains in a Thin Disk Subjected to External Pressure

Influence of the Replacement of the Actual Plastic Orthotropy with Various Approximations of Normal Anisotropy on Residual Stresses and Strains in a Thin Disk Subjected to External Pressure

Numerical and experimental analysis of edge wave defect control during TA2 circular tube cold roll forming

Ductility Improvement in Commercially Pure Aluminium by Friction Stir Processing

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