Flow stress models for deformation under varying condition—finite element method simulation

Svyetlichnyy, Dmytro; Nowak, J.; Biba, Nikolay; Łach, Łukasz

doi:10.1007/s00170-016-8506-7

Cited by 8 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both internal variable and state variable models of flow stress have been used in forging process modelling [22]. In this study, a viscoplastic constitutive model from [23] was employed.…”

Section: Numerical Modelling 31 Materials Modelmentioning

confidence: 99%

Direct powder forging of PM nickel-based superalloy: densification and recrystallisation

Wang

Fang

Shi

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Powder metallurgy nickel-based superalloys have been widely used in high temperature applications. For these materials, a fully dense and fine-grained microstructure is important. Full densification can be achieved by a suitable processing technique, while the latter can be achieved through recrystallisation for which valuable guidance is provided by the information about recrystallisation nuclei. In this study, a fully dense powder metallurgy nickel-based superalloy component has been produced by a new manufacturing methoddirect powder forging-using a single acting hydraulic press under normal atmosphere. Boundary misorientation of the produced material has been analysed to determine the degree of recrystallisation nucleation. A finite element model for direct powder forging has been developed in DEFORM-2D/3D and validated by comparing experimental and simulated load curves. The relationship of stress and strain state with densification and recrystallisation nucleation degree has been analysed. It was found that the direct powder forged FGH96 alloy has a much higher recystallisation nucleation degree and more recrystallised sub-grains, compared with those of the hot isostatic pressed material. Within the forged component, a higher recystallisation nucleation degree resides in the material near the container wall where greater values of shear strain rate have operated.

show abstract

“…Both internal variable and state variable models of flow stress have been used in forging process modelling [22]. In this study, a viscoplastic constitutive model from [23] was employed.…”

Section: Numerical Modelling 31 Materials Modelmentioning

confidence: 99%

Direct powder forging of PM nickel-based superalloy: densification and recrystallisation

Wang

Fang

Shi

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…However, simulation results' accuracy relies on the data quality and the range of these parameters; such range should cover the entire range of the analyzed process [1]. It is well known that an accurate description of material behavior under varying conditions is highly beneficial for computer simulations [2]. When a computer-aided process is carried out, it is accepted that the characterization should be performed in a way that represents, with significance, the actual procedure.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the hot compression test for bulk metal forming application

et al. 2022

View full text Add to dashboard Cite

In this study, a comparison between the well-established Lagrangian approach and the Arbitrary Lagrangian–Eulerian (ALE) approach is presented. This comparison aims to verify the ALE's approach suitability for modeling thermomechanical processes. After that, a study on the material's stress state evolution inside the specimen is provided. The stress state is evaluated through the triaxiality factor and Lode parameter. Ideally, under pure compression, these parameters' values are − 1/3 and − 1, respectively. However, it is not possible to achieve ideal conditions in actual experiments. The Lagrangian model was done in QForm, and the ALE model was done in LS-Dyna. The results from both models are in good agreement between them and agree with the force vs. stroke measured during the experiments. Two paths were defined to study the stress state inside the sample, in the radial direction (equator line) and axial direction (axial line). It was concluded that some areas in both paths might be considered as approximately under pure compression stress state. In addition, the ALE approach accuracy for thermomechanical modeling was verified.

show abstract

“…The use of the constitutive model embedded in the analysis software allows the simulation to fully describe the hot working behavior of the material [12,13], which can then provide reliable reference information for actual hot working to improve the process [14]. For example, Svyetlichnyy et al [15] developed the constitutive model of materials into FEM, and carried out a numerical simulation of the formation process of the corresponding material. However, the material library of existing finite element software lacks the 5754 aluminum alloy so that the numerical simulation of the alloy is usually replaced by an approximate material.…”

Section: Introductionmentioning

confidence: 99%

Application of the Constitutive Model in Finite Element Simulation: Predicting the Flow Behavior for 5754 Aluminum Alloy during Hot Working

Liu

2017

Metals

View full text Add to dashboard Cite

Abstract:The flow behavior of 5754 aluminum alloy was researched using the plane strain compression test for the range of 300-500 • C and 0.1-10 s −1 . The experimental flow curves acquired directly from Gleeble-3500 show that deformation parameters have a significant effect on the flow curves. All curves show a broad peak due to the dynamic softening after the work hardening. In addition, the flow curves display a slight downward trend after reaching the peak stress at low and medium strain rates. This softening mechanism has been further investigated by the work hardening rate and the results show that the flow characteristics of 5754 aluminum alloy are mainly controlled by the mechanism of competition between hardening, dynamic recovery and continuous dynamic recrystallization. Based on the corrected true strain-stress curves, the constitutive model of the corresponding softening mechanism has been established by a linear regression method. Then, the developed model was embedded in the finite element (FE) analysis software (ABAQUS) by encoding the UHARD subroutine and the hot compression process of the alloy was simulated and analyzed. The simulation results show that the sample has an uneven flow in the deformation zone, which is consistent with the grain morphology of the corresponding region of the test sample. In addition, the simulated load-stroke values were well fitted to the experimental data. The predictive ability of the model was quantified by statistical indicators. It emerged that the FE of the embedded constitutive model effectively simulates the hot working process of 5754 aluminum alloy, which has reference value for actual processing.

show abstract

Flow stress models for deformation under varying condition—finite element method simulation

Cited by 8 publications

References 25 publications

Direct powder forging of PM nickel-based superalloy: densification and recrystallisation

Direct powder forging of PM nickel-based superalloy: densification and recrystallisation

Numerical study on the hot compression test for bulk metal forming application

Application of the Constitutive Model in Finite Element Simulation: Predicting the Flow Behavior for 5754 Aluminum Alloy during Hot Working

Contact Info

Product

Resources

About