Plastic deformation mechanism of pure aluminum at low homologous temperatures

Kuo, Chung-Ming; Chu, Haijan

doi:10.1016/j.msea.2005.03.116

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…where F is the change of Helmholtz free energy, τ is the shear stress, p and q are obstacle distribution parameters. In this model, the values of p and q are assumed to be p = q = 1 [27][28][29].…”

Section: Acoustic-plastic Constitutive Equationmentioning

confidence: 99%

“…A simplified Gibbs free energy variation model suitable for the distribution of multiple obstacles is expressed by [26, 27], where is the change of Helmholtz free energy, is the shear stress, p and q are obstacle distribution parameters. In this model, the values of p and q are assumed to be p = q = 1 [27-29].…”

Section: Acoustic-plastic Constitutive Equationmentioning

confidence: 99%

“…A common thermal activation model can be written as [29], where is the shear strain rate, is the pre-factor [27], is the Boltzmann constant, and T is the absolute temperature.…”

Section: Acoustic-plastic Constitutive Equationmentioning

confidence: 99%

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Constitutive equation with residual hardening effect for modeling the ultrasonic vibration enhanced friction stir welding process

Yang

Chen

2019

Science and Technology of Welding and Joining

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A modified acoustic-plastic constitutive model characterising both acoustic softening and residual hardening effects on aluminium alloys is developed and applied into a computational fluid dynamic model for the ultrasonic vibration enhanced friction stir welding (UVeFSW) process. The flow stress and material flow field in UVeFSW are quantitatively analysed. The effect of acoustic residual hardening on the streamlines density at rear advancing side is examined by comparing with that based on the model considering just acoustic softening. The numerical simulation results are experimentally validated, and it is found that the modified constitutive equation improves the prediction accuracy of the flow stress and material flow field in UVeFSW.

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Section: Acoustic-plastic Constitutive Equationmentioning

confidence: 99%

Section: Acoustic-plastic Constitutive Equationmentioning

confidence: 99%

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Constitutive equation with residual hardening effect for modeling the ultrasonic vibration enhanced friction stir welding process

Yang

Chen

2019

Science and Technology of Welding and Joining

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“…The polycrystal model is compressed to half its thickness at a strain rate of 10 −3 /s, where the plane strain problem is assumed. The employed material parameters are as follows [24,25]: κ = 0.03,γ system, some grains rotate toward θ = 0 or π and the others are refined. Inside the refined grains, high stored energies, or dislocation densities, are observed.…”

Section: Phase-field Modelmentioning

confidence: 99%

Phase-field model during static recrystallization based on crystal-plasticity theory

Takaki

Yamanaka

Higa

et al. 2007

J Computer-Aided Mater Des

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A numerical model and computational procedure for static recrystallization are developed using a phase-field method coupled with crystal-plasticity theory. In this model, first, the microstructure and dislocation density during the deformation process of a polycrystalline metal are simulated using a finite element method based on strain-gradient crystal-plasticity theory. Second, the calculated data are mapped onto the regular grids used in the phase-field simulation. The stored energy is calculated from the dislocation density and is smoothed to avoid computational difficulty. Furthermore, the misorientation required for nucleation criteria is calculated at all grid points. Finally, phase-field simulation of the nucleation and growth of recrystallization is performed using the mapped data. By performing a series of numerical simulations based on the proposed numerical procedure, it has been confirmed that the recrystallization microstructure can be reproduced from the deformation microstructure.

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Constitutive modeling and deformation analysis for the ultrasonic-assisted incremental forming process

Cheng

Chen

et al. 2019

Int J Adv Manuf Technol

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Plastic deformation mechanism of pure aluminum at low homologous temperatures

Cited by 8 publications

References 18 publications

Constitutive equation with residual hardening effect for modeling the ultrasonic vibration enhanced friction stir welding process

Constitutive equation with residual hardening effect for modeling the ultrasonic vibration enhanced friction stir welding process

Phase-field model during static recrystallization based on crystal-plasticity theory

Constitutive modeling and deformation analysis for the ultrasonic-assisted incremental forming process

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