A crystal plasticity based work-hardening/softening model for b.c.c. metals under changing strain paths

Peeters, Bart; Kalidindi, Surya R.; Houtte, Paul Van; Aernoudt, Etienne

doi:10.1016/s1359-6454(00)00047-1

Cited by 119 publications

(72 citation statements)

References 17 publications

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“…From the modeling point of view, transients related to strain-path changes have been approached either by phenomenological continuum plasticity theory with the intention to mimic microstructural changes by introducing additional internal variables, or by using physically-5 based models taking advantage of the crystal plasticity framework, Peeters et al (2000), Holmedal et al (2008). While crystal plasticity models are computationally demanding when applied in finite element simulations on industrial scale, the additional computational cost paid in continuum plasticity models for implementing the constitutive relations required for capturing strain-path changes is low.…”

Section: Modelsmentioning

confidence: 99%

“…The digital image correlation (DIC) technique has become increasingly popular for revealing the strain field in mechanical experiments (Benallal et al, 2008;De Codes et al, 2011;Rastogi, 2000;Roux et al, 2008;Sutton et al, 2000). Peeters et al (2000) assumed that strain-path changes in IF steels introduced only transient changes in the stress-strain curves, which vanish after a certain strain, from which the stressstrain curves tend to follow the behavior of the monotonic curve of the new deformation mode.…”

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confidence: 99%

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Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

Maník

Holmedal

Hopperstad

2015

International Journal of Plasticity

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Commercially pure aluminum with random texture was prestrained either by rolling or by uniaxial compression, and then tested in uniaxial tension to study the transients in flow stress, work hardening and r-value induced by the strain-path change. New experimental results are reported on the variation of the r-value and the permanently reduced work hardening subsequent to the strain-path change. A continuum plasticity model was developed that can reproduce the observed behavior. The model applies a second-order "delayed pointer" tensor to represent the microstructural anisotropy and was implemented into the finite element software LS-DYNA. The model was calibrated to the experimental data, and a simulation of early strain localization subsequent to an orthogonal strain-path change was compared to strain fields measured by a digital image correlation technique.2

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Section: Modelsmentioning

confidence: 99%

mentioning

confidence: 99%

Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

Maník

Holmedal

Hopperstad

2015

International Journal of Plasticity

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“…These grain boundaries provide a higher density of dislocations for slip and slide of grains compared to LAGBs. Movement of these dislocations and the dislocations piled up close to the grain boundaries facilitate the grain boundary sliding and the grain rotation resulting in an increase in the formability [13][14][15]. In the areas of high shear strain the availability of a bimodal microstructure (a mixture of grains with varying size and properties) including ultra-fine grains along with elongated ones can be observed [16].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and mechanical properties of IF steel deformed during plane stress local torsion

et al. 2011

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A novel localized severe plastic deformation process for reinforcement of fastener holes is presented.This process is capable of inducing large shearing strains confined to an axi-symmetric zone around a hole. The process was applied to thin interstitial free steel samples. In the material around the hole, significant grain refinement was achieved, and a gradient of refinement was observed moving away from the hole. The ultimate and yield strengths were increased by 28% and 100% respectively.

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“…Bauschinger effect (Bauschinger, 1881;Hasegawa et al, 1975) and hardening stagnation (Boers et al, 2010;He et al, 2014) may be observed after reverse SPCs, while orthogonal hardening or softening Hasegawa et al, 1975;Manopulo et al, 2015;Peeters et al, 2000;Tarigopula et al, 2008) may happen after orthogonal SPCs. However, the transients may sometimes influence the subsequent part of the stress-strain…”

Section: Introductionmentioning

confidence: 99%

Modeling strain-path changes in aluminum and steel

Qin

Holmedal

Zhang

et al. 2017

International Journal of Solids and Structures

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The present paper evaluates two phenomenological plasticity models which account for the influence of strain-path change (SPC) on the stress-strain behavior. The HAH model (Barlat et al., 2014) is modified to capture SPC transients observed in aluminum, i.e., hardening stagnation after reverse SPCs and permanent softening after orthogonal SPCs. Predictions by the HAH model are compared to the MHH model (Mánik et al., 2015), which was originally developed for aluminum. The MHH model turned out to be directly applicable to an extra deep drawing quality (EDDQ) steel without any modifications. The MHH model predicts the stress-strain behavior after single SPCs slightly better than the HAH model for both aluminum and steel. It can also capture correctly R-value transients in aluminum after purely orthogonal SPCs. However, only the HAH model can capture transients after double SPCs qualitatively for low carbon steels. The applicability of these advanced continuum plasticity models to aluminum and steel and the differences in their mathematical formulation are discussed.

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A crystal plasticity based work-hardening/softening model for b.c.c. metals under changing strain paths

Cited by 119 publications

References 17 publications

Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

Microstructure and mechanical properties of IF steel deformed during plane stress local torsion

Modeling strain-path changes in aluminum and steel

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