Ductile damage modeling at elevated temperature applied to the cross wedge rolling of AA6082-T6 bars

Novella, Michele Francesco; Ghiotti, Andrea; Bruschi, Stefania; Bariani, Paolo Francesco

doi:10.1016/j.jmatprotec.2015.01.030

Cited by 81 publications

(57 citation statements)

References 31 publications

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“…These tests consists in the use of specimens with specially designed shapes (axisymmetric or flat) in order to accelerate fracture of the material. The research conducted by many scientists demonstrates that fracture depends not only on grain size, temperature and strain rate [1,[9][10][11], but on the state of stress described by a strain history as well [3,[12][13][14][15]. The main conclusion drawn from the results is that the ductile fracture criterion is well-suited for the modelling of material fracture when the stresses are similar in the test and the investigated process alike.…”

Section: Introductionmentioning

confidence: 96%

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Preliminary Analysis of a Rotary Compression Test

Pater¹,

Walczuk²,

Lis³

et al. 2018

Adv. Sci. Technol. Res. J.

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The paper addresses the problem of material fracture in cross rolling processes. A new test based on rotary compression for determining limit values of the damage function after the Cockroft-Latham criterion is proposed. A FEM analysis is performed to determine the stress and strain states in a workpiece subjected to this test. The numerical results demonstrate that the axial region of the workpiece is characterized by the presence of alternating tensile and compressive stresses conducive to fracture. The distribution of the Cockroft-Latham integral in the axial region of the workpiece is determined.

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Section: Introductionmentioning

confidence: 96%

“…A frequent failure mode in cross and skew rolling processes is the occurrence of fracture in the axial region of the workpiece, known as the Mannesmann effect [10,[16][17][18]. The fracture is caused by alternating compressive and tensile stresses that occur in this region and change their sign twice in one rotation of the workpiece.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Analysis of a Rotary Compression Test

Pater¹,

Walczuk²,

Lis³

et al. 2018

Adv. Sci. Technol. Res. J.

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show abstract

“…In 2011, Bai et al studied the influence of carbides and grain boundary conditions on the fracture behavior of a Ni-Cr-W-based superalloy and concluded that the strength of the grain boundary was weakened by the lamellar M23C6 carbides with a 1-3-µm width [7]. A modified Oyane-Sato fracture criterion was proposed and applied to the cross wedge rolling process of the AA6082-T6 bars by Novella et al who performed hot tensile tests at elevated temperatures [8]. The effects of the microstructure on hot tensile deformation behavior of 7075 alloy was evaluated by Wang and his co-workers [9].…”

Section: Introductionmentioning

confidence: 99%

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Xiao

Huang

Liu

et al. 2016

Metals

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Abstract:To better understand the tensile deformation and fracture behavior of 35CrMo steel during hot processing, uniaxial tensile tests at elevated temperatures and strain rates were performed. Effects of deformation condition on the flow behavior, strain rate sensitivity, microstructure transformation, and fracture characteristic were characterized and discussed. The results indicated that the flow stress was sensitive to the deformation condition, and fracture occurs immediately after the peak stress level is reached, especially when the temperature is low or the strain rate is high. The strain rate sensitivity increases with the deformation temperature, which indicates that formability could improve at high temperatures. Photographs showing both the fracture surfaces and the matrix near the fracture section indicated the ductile nature of the material. However, the fracture mechanisms varied according to the deformation condition, which influences the dynamic recrystallization (DRX) condition, and the DRX was accompanied by the formation of voids. For samples deformed at high temperatures or low strain rates, coalescence of numerous voids formed in the recrystallized grains is responsible for fracture, while at high strain rates or low temperatures, the grains rupture mainly by splitting because of cracks formed around the inclusions.

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“…Meanwhile, Huo et al [25][26][27] used a set of constitutive equations to predict the microstructure and ductile damage of a high-speed railway axle steel during CWR. Novella et al [28] modelled the ductile damage for CWR of AA6082-T6 bars. Huang et al [29] compared the warm and hot CWR by numerical simulation and experimental trial.…”

Section: Working Principle Of Cross Wedge Rollingmentioning

confidence: 99%

Research and industrialization of near-net rolling technology used in shaft parts

2018

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Shaft part rolling is an efficient and green nearnet shaping technology offering many advantages, including high production efficiency, high material utilization rate, high product quality, and excellent production environment. In this paper, the features of shaft part rolling are introduced along with the working principles of two main shaft part rolling technologies, namely, cross wedge rolling (CWR) and skew rolling (SR). In relation to this technology, some R&D achievements gained by the University of Science and Technology Beijing are summarized. Finally, the latest developments in shaft part rolling are presented, including SR steel balls, precise forming of camshaft blank by CWR, SR phosphorous copper balls at room temperature, and CWR hollow axle sleeve. Although the shaft part rolling technology has been widely used in China, it only accounts for about 15% of applicable parts at present. Nevertheless, this technology has broad application prospects.

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Ductile damage modeling at elevated temperature applied to the cross wedge rolling of AA6082-T6 bars

Cited by 81 publications

References 31 publications

Preliminary Analysis of a Rotary Compression Test

Preliminary Analysis of a Rotary Compression Test

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Research and industrialization of near-net rolling technology used in shaft parts

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