Strain rate jump induced negative strain rate sensitivity (NSRS) in aluminum alloy 2024: Experiments and constitutive modeling

Gupta, Satyapriya; Beaudoin, Armand Joseph; Chevy, Juliette

doi:10.1016/j.msea.2016.12.010

Cited by 26 publications

(13 citation statements)

References 52 publications

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“…The role of the transport of GNDs in ice single-or multi-crystals was highlighted in Taupin et al (2007) and Richeton et al (2017). Varadhan et al (2009) and Gupta et al (2017) coupled the MFDM equations with a dynamic strain aging (DSA) model in order to predict the strain-aging behaviors of single crystalline and polycrystalline Al alloys.…”

mentioning

confidence: 99%

A FFT-based numerical implementation of mesoscale field dislocation mechanics: Application to two-phase laminates

Djaka

Berbenni

Taupin

et al. 2020

International Journal of Solids and Structures

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confidence: 99%

A FFT-based numerical implementation of mesoscale field dislocation mechanics: Application to two-phase laminates

Djaka

Berbenni

Taupin

et al. 2020

International Journal of Solids and Structures

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“…The role of GND density transport in ice single-or multi-crystals was studied in Taupin et al (2007) and Richeton et al (2017). Varadhan et al (2009) and Gupta et al (2017) coupled the MFDM equations with a dynamic strain aging model in order to predict the strain-aging behaviors of single crystalline and polycrystalline Al alloys. More recently, dislocation pattern formation and associated size effects was investigated by Arora and Acharya (2019) using finite deformation MFDM.…”

mentioning

confidence: 99%

A fast Fourier transform-based mesoscale field dislocation mechanics study of grain size effects and reversible plasticity in polycrystals

Berbenni

Taupin

Lebensohn

2020

Journal of the Mechanics and Physics of Solids

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To cite this version:Stéphane Berbenni, Vincent Taupin, Ricardo Lebensohn. A fast Fourier transform-based mesoscale field dislocation mechanics study of grain size effects and reversible plasticity in polycrystals. AbstractA numerical implementation of a non-local polycrystal plasticity theory based on a mesoscale version of the field dislocation mechanics theory (MFDM) of Acharya and Roy (2006) is presented using small-strain elasto-viscoplastic fast Fourier transformbased (EVPFFT) algorithm developed by Lebensohn et al. (2012). In addition to considering plastic flow and hardening only due to SSDs (statistically stored dislocations) as in the classic EVPFFT framework, the proposed method accounts for the evolution of GND (geometrically necessary dislocations) densities solving a hyperbolic-type partial differential equation, and GND effects on both plastic flow and hardening. This allows consideration of an enhanced strain-hardening law that includes the effect of the GND density tensor. The numerical implementation of a reduced version of the MFDM is presented in the framework of the FFT-based augmented Lagrangian procedure of Michel et al. (2001). A Finite Differences scheme combined with discrete Fourier transforms is applied to solve both incompatibility and equilibrium equations. The numerical procedure named MFDM-EVPFFT is used to perform full field simulations of polycrystal plasticity considering different grain sizes and their mechanical responses during monotonic tensile and reversible tension-compression tests. Using Voronoi tessellation and periodic boundary conditions, voxelized representative volume elements (RVEs) with different grain sizes are generated. With MFDM-EVPFFT, a Hall-Petch type scaling law is obtained in contrast with the conventional crystal plasticity EVPFFT. In the case of reversible plasticity, a stronger Bauschinger effect is observed with the MFDM-EVPFFT approach in comparison with conventional EVPFFT. The origin of these differences is analyzed in terms of heterogeneity, GND density and stress evolutions during the compression stage.

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“…However for those studies, the materials (Al-3Mg [7] and FeMcC [8]) are all very sensitive to PLC instabilities in monotonic tensile tests. A recent work [9] reported the occurrence of Lüders effect after strain rate changes with the AA2024 aluminium alloy which, according to the authors, does not show highly serrated flow for monotonic tests. The triggering effect for the PLC effect by relaxation has also been reported for the AA2024 alloy in [10].…”

Section: Introductionmentioning

confidence: 96%

Portevin-Le Chatelier effect triggered by complex loading paths in an Al–Cu aluminium alloy

Ren

Morgeneyer

Mazière

et al. 2018

Philosophical Magazine

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Serrated flow has been observed during non monotonic tensile tests of an Al-Cu aluminium alloy in the naturally aged state. The associated propagative localization bands were observed by digital image correlation (DIC). In particular, the Portevin-Le Chatelier (PLC) effect and also Lüders bands were observed in interrupted tests during which the specimen was held for a length of time and also in tests with partial unloading followed by a holding time. Increasing strain rate jumps also triggered the PLC effect. These observations indicate the existence of the PLC effect in this material which was formerly considered insensitive to it at room temperature under monotonic loading conditions. There is no evidence of PLC serrations during constant strain rate tests. A strain ageing finite element model is used that captures the experimentally found PLC triggering effects.

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Strain rate jump induced negative strain rate sensitivity (NSRS) in aluminum alloy 2024: Experiments and constitutive modeling

Cited by 26 publications

References 52 publications

A FFT-based numerical implementation of mesoscale field dislocation mechanics: Application to two-phase laminates

A FFT-based numerical implementation of mesoscale field dislocation mechanics: Application to two-phase laminates

A fast Fourier transform-based mesoscale field dislocation mechanics study of grain size effects and reversible plasticity in polycrystals

Portevin-Le Chatelier effect triggered by complex loading paths in an Al–Cu aluminium alloy

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