Multiscale Modeling of Interfaces, Dislocations, and Dislocation Field Plasticity

McDowell, David L.

doi:10.1007/978-3-319-94186-8_5

Cited by 12 publications

(4 citation statements)

References 361 publications

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“…The design of fatigueresistant cold-formed sections requires a thorough understanding, at the material level, of the effect of existing plastic deformation on LCF behavior. It is known that the imposed plastic deformation develops microscopically [8,9] and creates a network of dislocations in the grains, dislocation pile-ups at the grain boundaries [10], and internal defects, which inhibit further dislocation movement and thus increase flow stress [11] and decrease ductility [12], which has been associated with inferior low cycle fatigue performance in steels [13,14].…”

Section: Introductionmentioning

confidence: 99%

Low Cycle Fatigue Behavior of Plastically Pre-Strained HSLA S355MC and S460MC Steels

et al. 2022

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Cold roll forming used in the manufacturing of lightweight steel profiles for racking storage systems is associated with localized, non-uniform plastic deformations in the corner sections of the profiles, which act as fatigue damage initiation sites. In order to obtain a clearer insight on the role of existing plastic deformation on material fatigue performance, the effect of plastic pre-straining on the low cycle fatigue behavior of S355MC and S460MC steels was investigated. The steels were plastically deformed at different pre-strain levels under tension, and subsequently subjected to cyclic strain-controlled testing. Plastic pre-straining was found to increase cyclic yield strength, decrease ductility, and induce cyclic softening, which, in S460MC, degrades fatigue resistance compared to the unstrained material. In unstrained conditions, the materials present a cyclic softening to hardening transition with increasing plastic strain amplitude, which in S355MC occurs at lower strain amplitudes and degrades its fatigue resistance with regard to the pre-strained material. Pre-straining also leads to a reduction in transition life from low to high cycle fatigue. SEM fractography, performed following the onset of crack initiation, revealed that plastic pre-straining reduces the fatigue fracture section as well as striation spacing, predominantly in the S355MC steel.

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Section: Introductionmentioning

confidence: 99%

Low Cycle Fatigue Behavior of Plastically Pre-Strained HSLA S355MC and S460MC Steels

et al. 2022

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“…Forming processes in metallurgy are characterised by a deformation beyond the elastic range with the aim of a permanent effect in shaping operations, so a plastic deformation is involved. In the context of material science and mechanics, plasticity mechanisms and modelling are still an open research field [8,9]; besides, due to the non-linearity of plastic processes, the associated computational problem is also a complex issue [10,11]. Deformation history during forming influences thus the mechanical behaviour of members in structural systems [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Residual stresses in cold-formed steel members: Review of measurement methods and numerical modelling

Díaz

Cuesta

Alegre

et al. 2021

Thin-Walled Structures

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“…The phenomena that affect material responses and properties span multiple length scales. The modeling of such defect structures is an inherently multiscale problem 5,6 , and balancing accuracy and applicability becomes increasingly important. The behavior of individual dislocations, microstructure-scale mechanisms, and collective dislocation interactions must be bridged to enable predictive simulation of dislocation plasticity.…”

Section: Introductionmentioning

confidence: 99%

Temperature and composition dependent screw dislocation mobility in austenitic stainless steels from large-scale molecular dynamics

et al. 2020

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Extensive molecular dynamics simulations are performed to determine screw dislocation mobility in austenitic Fe0.7NixCr0.3-x stainless steels as a function of temperature ranging from 100 to 1300 K, resolved shear stress from 30 to 140 MPa, and Ni composition from 0.0 to 30.0 at%. These mobility data are fitted to a linear mobility law with a nonzero stress offset, referred to as the threshold stress. We find that both the linear drag coefficient and the threshold stress increase with Ni composition. The drag coefficient increases with temperature, whereas the threshold stress decreases with temperature. Based on these calculations, we determine fitting functions for the linear solute drag coefficient as a function of temperature and composition. The mobility laws determined in this study may serve to inform dislocation dynamics simulations pertinent to dislocation network evolution at elevated temperatures for a wide composition range of austenitic stainless steels.

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Multiscale Modeling of Interfaces, Dislocations, and Dislocation Field Plasticity

Cited by 12 publications

References 361 publications

Low Cycle Fatigue Behavior of Plastically Pre-Strained HSLA S355MC and S460MC Steels

Low Cycle Fatigue Behavior of Plastically Pre-Strained HSLA S355MC and S460MC Steels

Residual stresses in cold-formed steel members: Review of measurement methods and numerical modelling

Temperature and composition dependent screw dislocation mobility in austenitic stainless steels from large-scale molecular dynamics

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