Investigation on granular medium forming formability of TA1 titanium alloy cylinder-shaped parts

Hu, Biao; Cai, Gaoshen; Fu, Jubo; Xin, Yanxi; Liu, Kangning; Li, Lihui

doi:10.1007/s00170-021-08108-w

Cited by 6 publications

(5 citation statements)

References 20 publications

(23 reference statements)

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“…The Pipe Granular Media Forming process is a modern plastics processing technique for nearnet shape forming [22]. In this paper, yttria-stabilized zirconia ceramic beads with a particle size of 0.8-1 mm were selected as the pressure transfer medium, as shown in Figure 1 below, the flexible bulging test of granular media in bionic egg-shaped shells using unilateral axial pressurization.…”

Section: Granular Media Forming Process Analysismentioning

confidence: 99%

Influence of unidirectional loading pusher head structure on the deformation law of bionic egg-shaped shells in internal high-pressure bulging

Sun,

Shen,

Shi

et al. 2024

Int J Adv Manuf Technol

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A solid particle medium flexible bulging technology is proposed to solve the problems of low molding precision, poor stability, and uneven deformation that may occur when processing bionic egg-shaped shells by the traditional bulging process. By optimizing the mold parameters, such as the angle and height of the pusher head, the flow characteristics of the granular material are improved, resulting in improved machining accuracy and surface quality when molding egg-shaped plastic shells. In this paper, we utilize a ø0.8-1 mm yttria-stabilized zirconia ceramic bead to serve as a pressure-transfer medium during the granular media forming process. Several different shapes of pusher heads with cone angles of 45°, 60°, 75°, and 90° and heights of 10mm, 25mm, and 40mmwere designed and manufactured. The numerical model of simulation was verified by the analysis of strain inhomogeneity coefficient, and the maximum thinning rate at the apex of bulging of the egg-shaped test was measured and calculated. The results show that the maximum thinning rate at the apex of bulging is the largest for the pusher head with 45° cone angle and 25mm height, and the strain distribution is the most uniform and the expansion effect is the best. The study shows that the optimization of the process parameters of the pusher head shape can effectively improve the uniformity of the strain distribution and thickness distribution during the egg-shaped shell forming process, thus improving the machining accuracy of the plastic deformation of the bionic egg-shaped tube test piece.

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Section: Granular Media Forming Process Analysismentioning

confidence: 99%

Influence of unidirectional loading pusher head structure on the deformation law of bionic egg-shaped shells in internal high-pressure bulging

Sun,

Shen,

Shi

et al. 2024

Int J Adv Manuf Technol

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“…In this paper, the SGMF process employs non-metallic particles primarily composed of SiO2 as the pressure-transmitting medium [22,23]. The particle size ranges from φ 0.117 to φ 0.14 mm, with a Rockwell hardness of 48-55HRC.…”

Section: Triaxial Compression Tests On Solid Granules Mediummentioning

confidence: 99%

“…To address the issues with the Mohr-Coulomb model, in 1952, Drucker and Prager introduced a straightforward modification of the Mohr-Coulomb surface by approximating it as a smooth form of the von Mises yield criterion [23].…”

Section: Drucker-prager Criterionmentioning

confidence: 99%

“…They developed a plastic deformation formula specifically for sheet metal and conducted separate simulations using Finite Element Method (FEM) and Discrete Element Method (DEM) to predict tube wrinkling, resulting in reduced computational costs. Hu et al [23] employed the Mohr-Coulomb constitutive model (M-C model) to conduct numerical simulations of the SGMF process. They compared these simulations with experiments involving granular medium deep drawing of titanium alloy thin sheets.…”

Section: Introductionmentioning

confidence: 99%

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Establishment of a constitutive model for the solid granules medium and its application in sheet metal forming

Shi,

Zhao,

Shen

et al. 2024

Int J Adv Manuf Technol

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The solid granules medium forming process is a new type of forming process that employs solid granules medium as the medium for force transfer. To effectively predict experimental results, establishing an appropriate simulation model for the SGMF process is paramount. However, due to the intricate contact and frictional relationships inherent within solid granules medium, the precise development of constitutive models for these materials remains a significant challenge. In this study, the mechanical properties of the solid granules medium were investigated by triaxial compression tests, and the results showed that these properties were similar to those of over-consolidated soil or dense sand. Then, based on the parameters of the triaxial compression test, four different mechanical models for the solid granules medium were constructed, including the Mohr-Coulomb model, Drucker-Prager model, Drucker-Prager Cap model and DEM-FEM model. These models are used to numerically simulate the pressure transfer performance within the solid granules medium.Comparison with experimental data shows that the Drucker-Prager Cap model can predict the pressure transfer performance of solid granules medium with greater precision. Finally, the solid granules medium is employed in conducting the deep drawing test of 08Al cylindrical parts with hemispherical bottom, and the results are compared with the finite element model. The accuracy of the Drucker-Prager Cap model in predicting the thickness distribution of formed parts is confirmed.Therefore, the model can be used as the constitutive model for solid granules medium forming in the simulation model.

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“…TA1 standard powder (BLT Inc, Xi'an, CN), was used as the SLM molding material. It has certain mechanical properties, good biocompatibility, and excellent corrosion resistance, meaning it has broad application prospects in chemical, shipbuilding, medical and other fields [14,15]. The composition of the TA1 material is listed in Table 1.…”

Section: Printing Materialsmentioning

confidence: 99%

Influence of Typical Technological Parameters on the Forming Quality of TA1 in Selective Laser Melting

Chen,

Zhou,

Huang

et al. 2023

Metals

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As an emerging additive manufacturing technology with potential, selective laser melting (SLM) technology is one of the current mainstream additive manufacturing processes. Many complex conditions affect the quality of the SLM products, such as extremely short forming time, rapidly changing forming environment, and micron-level melting area. Numerical simulation and a printing experiment were used to study the influence of typical technological parameters on the forming quality of SLM products, where TA1 was used as the printing material. The typical technological parameters mainly considered laser power, laser scanning speed, hatch spacing, and laser energy density. Simulation analysis was based on the maximum temperature and the size of the molten pool, and the printing experiment was focused on the parameter design methods for typical processes and the forming quality of printed products. The results show the following: (1) An increase in laser power and laser energy density can significantly improve the forming quality. However, excessive input energy will lead to poor surface quality; (2) Scanning speed and hatch spacing need to be selected according to the size of the molten pool, which mainly influences the lap rate of the molten pool. The results of this study may provide some guidance for parameter setting and forming quality optimization in SLM manufacturing process.

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Investigation on granular medium forming formability of TA1 titanium alloy cylinder-shaped parts

Cited by 6 publications

References 20 publications

Influence of unidirectional loading pusher head structure on the deformation law of bionic egg-shaped shells in internal high-pressure bulging

Influence of unidirectional loading pusher head structure on the deformation law of bionic egg-shaped shells in internal high-pressure bulging

Establishment of a constitutive model for the solid granules medium and its application in sheet metal forming

Influence of Typical Technological Parameters on the Forming Quality of TA1 in Selective Laser Melting

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