Anisotropic deformation behavior under various strain paths in commercially pure titanium Grade 1 and Grade 2 sheets

Yi, Ning; Hama, Takayuki; Kobuki, Akihiro; Fujimoto, Hitoshi; Takuda, Hirohiko

doi:10.1016/j.msea.2015.12.081

Cited by 58 publications

(13 citation statements)

References 45 publications

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“…2. Such anisotropic tendencies observed in CP-Ti (grade 2) are attributable to the material texture [2,17] and its effects on slip and twinning activity [18].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Impact of machining-induced surface defects on the edge formability of commercially pure titanium sheet at room temperature

2020

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Despite the good properties of titanium, which have drawn the interest of various industries over the years, one of the major drawbacks of this material is its poor machinability. This has largely been attributed to its low thermal conductivity and elastic modulus. The ability to attain the optimum sheet edge performance during forming is dependent on the quality of the edges produced. Also, the demanding nature of aerospace part design has provoked the interest of both industry and academia to continually explore avenues tailored at enhancing part performance. The sort of edge surface integrity produced for aerospace part fabrication thus becomes a vital consideration in the quest to ensuring prime performance of components. This work seeks to study the influence of different machining-induced surface defects on the sheet edge performance of CP-Ti (grade 2) at room temperature. Hole expansion test was used to assess the edge surface formability of CP-Ti with different machining-induced edge defects. The research found that machining-induced surface defects act as stress concentration sites during the hole expansion test and have a major impact on the material flow. Electro-discharge machined edges were observed to exhibit high edge formability compared to laser and abrasive water jet cut edges due to the impact of machining-induced microstructural changes.

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“…2. Such anisotropic tendencies observed in CP-Ti (grade 2) are attributable to the material texture [2,17] and its effects on slip and twinning activity [18].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Impact of machining-induced surface defects on the edge formability of commercially pure titanium sheet at room temperature

2020

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“…[13][14][15][16][17][18] In contrast, although activities of several types of twinning systems have been reported in CP-Ti, { } 10 12 tensile twinning and { } 1122 compressive twinning are more active and could affect plastic deformation behavior even at small strains. 50,51) Therefore, in our study, these two families of twinning systems were considered. 19) This combination is almost equivalent to the used in the recent literature.…”

Section: Selection Of Slip and Twinning Systemsmentioning

confidence: 99%

Crystal Plasticity Modeling for Non-ferrous Metals and its Engineering Applications

Hama

2020

ISIJ Int.

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Crystal plasticity models enable predictions of macroscopic deformation behavior as well as texture evolution of metallic materials based on mesoscopic deformation at the grain level. Owing to recent improvements in predictive accuracy, crystal plasticity models are expected to be used not only for academic purposes but also for industrial applications. There are several possible approaches for utilizing crystal plasticity models in industrial applications, including numerical material testing, in which the material parameters of phenomenological constitutive models are determined; alternative constitutive equations in simulations; and the development of innovative materials with improved formability. In this review paper, recent progress in crystal plasticity modeling, specifically in terms of engineering applications, is discussed. The focus is primarily on hexagonal close-packed (hcp) metals, including magnesium alloy and commercially pure titanium sheets, which exhibit strong anisotropic and asymmetric deformation behavior. On the basis of our recent progresses, the crystal plasticity modeling was first explained, followed by some application examples for a variety of loading conditions, including uniaxial tension and compression, reverse loading, and biaxial tension. The application to face-centered cubic (fcc) and body-centered cubic (bcc) metals and future prospects are also discussed.

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“…The distribution and values of plastic strains, changes in the sheet thickness and the panel width after the forming process, as well as the springback after unloading were analysed. The numerical calculation results, for example for the drawn parts formed of Grade 1 titanium in dry conditions according to configuration (2), are presented in Figs 6-8.…”

Section: Numerical Analysis Of Forming Process Of Thin Titanium Panelmentioning

confidence: 99%

“…It is applied both as commercially pure titanium [1,2] and titanium alloys [3][4][5]. Commercially pure titanium is used for less demanding structural components which are not required to be so highly mechanically strong, but are rather only expected to be light, resistant to corrosion and able to operate at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of forming thin titanium panels with stiffeners

Adamus

Winowiecka

Dyner

2017

Archives of Metallurgy and Materials

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The growing demand for light and durable products has caused an increase in interest in products formed of thin sheets. In order to ensure sufficient stiffness of the drawn -parts, stiffening is often performed. Unfortunately, during the forming of stiffeners unwanted deformations of the drawn parts very often appear, which prevent them from further exploitation. In the paper, forming thin titanium panels with stiffeners is analysed. The panels are made of sheets of commercially pure titanium: Grades 2, 3 and 4. In the results of numerical analyses which were performed using PamStamp 2G, taking into consideration the impact of the blank holder force and friction conditions on the strain distribution in the drawn parts, sheet thinning and springback values are presented. The numerical analysis results were compared with the experimental tests. It was concluded that in order to prevent panel deformation being a result of residual stresses, it is necessary to ensure adequate friction conditions on the contact surfaces between the deformed material and tools as well as a suitable blank holder force.

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Anisotropic deformation behavior under various strain paths in commercially pure titanium Grade 1 and Grade 2 sheets

Cited by 58 publications

References 45 publications

Impact of machining-induced surface defects on the edge formability of commercially pure titanium sheet at room temperature

Impact of machining-induced surface defects on the edge formability of commercially pure titanium sheet at room temperature

Crystal Plasticity Modeling for Non-ferrous Metals and its Engineering Applications

Analysis of forming thin titanium panels with stiffeners

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