Coupled FEM and texture modelling of plane strain extrusion of an aluminium alloy

Aukrust, Trond; Tjøtta, Stig; Vatne, Hans Erik; Houtte, Paul Van

doi:10.1016/s0749-6419(97)00003-x

Cited by 28 publications

(23 citation statements)

References 9 publications

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“…In order to predict the extrusion microstructure and texture, an accurate description of the deformation history in terms of these quantities is thus required. The initial step of the modeling exercise is to perform flow simulations by FEM, to provide the deformation history along relevant particle paths as output for the subsequent modeling (Aukrust et al, 1997;Zhang et al, 2015).…”

Section: Fem Simulationsmentioning

confidence: 99%

“…The deformation texture after extrusion can be numerically predicted by coupling FEM flow simulations and crystal plasticity models. Aukrust et al (1997) predicted the deformation texture for flat profile extrusions using the FC-and Relaxed-Constraints (RC)-Taylor model, while Perocheau and Driver (2000) made use of the RC-Taylor hypothesis and a viscoplastic constitutive law for their texture simulations. The deformation texture predictions and their through thickness variations were compared to corresponding experiments and showed reasonable qualitative agreement.…”

Section: Introductionmentioning

confidence: 99%

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Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling

et al. 2021

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In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity simulations and compared to experimentally measured textures obtained by electron back-scatter diffraction (EBSD). The AA6063 alloy was extruded at a relatively low temperature (350°C), while the AA6082 alloy, containing dispersoids that prevent recrystallization, was extruded at a higher temperature (500°C). Both alloys were water quenched at the exit of the die, to maintain the deformation texture after extrusion. In the center of the profiles, both alloys exhibit a conventional β-fiber texture and the Cube component, which was significantly stronger at the highest extrusion temperature. The classical full-constraint (FC)-Taylor and the Alamel grain cluster model were employed for the texture predictions. Both models were implemented using the regularized single crystal yield surface. This approach enables activation of any number and type of slip systems, as well as accounting for strain rate sensitivity, which are important at 350°C and 500°C. The strength of the nonoctahedral slips and the strain-rate sensitivity were varied by a global optimization algorithm. At 350°C, a good fit could be obtained both with the FC Taylor and the Alamel model, although the Alamel model clearly performs the best. However, even with rate sensitivity and nonoctahedral slip systems invoked, none of the models are capable of predicting the strong Cube component observed experimentally at 500°C.

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Section: Fem Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling

et al. 2021

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“…The effective deviatonic stress can be expressed in different forms according to different models. The commonly used models are Zener-Hollomon type (Aukrust, 1997) and the strain and strain-rate hardening type.…”

Section: Iteration Of the Dynamic Viscosity Coefficientmentioning

confidence: 99%

“…The influence of tangent strain to the deviatonic stress is usually ant, while the influence of the effective strain-rate becomes prominent. So the dynamic viscosity coefficient can be considered as a function of effective strain-rateε and temperature T (Aukrust, 1997;Altan et al, 1983). In this way, the hardening exponent of strain N in Eq.…”

Section: Iteration Of the Dynamic Viscosity Coefficientmentioning

confidence: 99%

“…The deformation of aluminum material is considered as a rigid-viscoplastic flow. The hot aluminum alloy material can be described as a non-linear Newtonian fluid material (Aukrust, 1997). A simple and efficient FVM approach, which employs SIMPLE algorithm to calculate the physical fields and uses VOF method to catch the free surface, is used to simulate the hot aluminum alloy profile extrusion process in transient and steady state.…”

Section: Introductionmentioning

confidence: 99%

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