The Influence of Post-Necking Strain Hardening Behaviour on Fatigue Lifetime Prediction of Cold-Formed High Strength Steel.

Gothivarekar, Sanjay; Coppieters, Sam; Talemi, Reza; Debruyne, Dimitri

doi:10.1016/j.promfg.2020.04.197

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…From previous research [4,6], an 'S'-shaped specimen is adopted. It has a minimum width of 68 mm, a bending ratio of 2 and die-width ratio of 10.…”

Section: Cold-bending and F Cold-bending And Fatigue Model Atigue Modelmentioning

confidence: 99%

“…The last two ratios were adopted from an industrial guideline [18] and describe the ratio of the punch radius and die-width to the plate thickness, respectively. More details on the specimen design and fatigue testing can be found in [4].…”

Section: Cold-bending and F Cold-bending And Fatigue Model Atigue Modelmentioning

confidence: 99%

“…Two implicit steps simulate the last bending operation in obtaining the final shape of the specimen: a static step for bending, followed by a dynamic step for springback [20]. For bending, a straight-angle punch stroke of -18.7 mm is imposed [4]. This value corresponds with a 90°angle after springback and is determined through several iterations.…”

Section: Cold-bending and F Cold-bending And Fatigue Model Atigue Modelmentioning

confidence: 99%

“…For example, cold-formed HSS sections can exhibit large residual stresses, forming prestrains and internal damage accumulation that affect structural performance as well as post-processing in FEA. To this end, recent studies [4,5,6] on the fatigue of cold-formed HSS, provided a validated workflow for modelling and testing this behaviour. However, this workflow currently ignores the possible effect of kinematic hardening on the stress reversal after forming and yielding upon reloading.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of kinematic hardening on the fatigue behaviour of bent high strength steel

Gothivarekar¹,

Coppieters²,

Talemi³

et al. 2021

Esaform 2021

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The integration of forming in the fatigue modelling of cold-formed components significantly improves the predictive accuracy of the estimated life. The current study investigated the fatigue behaviour of a bent specimen made from a 5 mm thick, S900MC high strength steel plate. Because of its superior static and dynamic strength, this grade is progressively used for hollow cold-formed sections in mobile applications. However, it exhibits a strong stress saturation as well as limited formability. In this regard, a finite element modelling framework was adopted from previous research and further developed to integrate bending in the fatigue modelling and life estimation procedure. However, this framework currently ignores the possible influence of kinematic hardening and associated Bauschinger effect. For this reason, a numerical study was performed that compares isotropic with kinematic hardening for this specific application. First, the characteristic behaviour of these models was verified in a virtual tension-compression test. Subsequently, they were implemented in forming simulation followed by fatigue loading. Herein, the stress-strain evolution was investigated and a multi-axial fatigue criteria was used to map the sensitivity of the estimated life to the type of hardening. In general, the stress that entered the fatigue calculation was at least 21% lower for the kinematic model. As a result, a significant increase of 65% was observed for the estimated fatigue life, yielding a better comparison with experimental data.

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“…From previous research [4,6], an 'S'-shaped specimen is adopted. It has a minimum width of 68 mm, a bending ratio of 2 and die-width ratio of 10.…”

Section: Cold-bending and F Cold-bending And Fatigue Model Atigue Modelmentioning

confidence: 99%

Section: Cold-bending and F Cold-bending And Fatigue Model Atigue Modelmentioning

confidence: 99%

Section: Cold-bending and F Cold-bending And Fatigue Model Atigue Modelmentioning

confidence: 99%

Section: Intr Introduction Oductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of kinematic hardening on the fatigue behaviour of bent high strength steel

Gothivarekar¹,

Coppieters²,

Talemi³

et al. 2021

Esaform 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…15,30–36 Prediction of true stress-true strain curve beyond uniform deformation (after the onset of necking) is useful for studying large plastic deformation phenomena occurring during metal forming, crash, fatigue, and fracture. 35–37…”

Section: Introductionmentioning

confidence: 99%

A full-range stress-strain model for metallic materials depicting non-linear strain-hardening behavior

Swain¹,

Selvan²,

Thomas³

et al. 2020

The Journal of Strain Analysis for Engineering Design

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Ramberg-Osgood (R-O) type stress-strain models are commonly employed during elasto-plastic analysis of metals. Recently, 2-stage and 3-stage R-O variant models have been proposed to replicate stress-strain behavior under large plastic deformation. The complexity of these models increases with the addition of each stage. Moreover, these models have considered deformation till necking only. In this paper, a simplistic multi-stage constitutive model is proposed to capture the strain-hardening non-linearity shown by metals including its post necking behavior. The constitutive parameters of the proposed stress-strain model can be determined using only elastic modulus and yield strength. 3-D digital image correlation was used as an experimental tool for measuring full-field strains on the specimens, which were subsequently utilized to obtain the material parameters. Our constitutive model is demonstrated with an aerospace-grade stainless steel AISI 321 wherein deformation response averaged over the gauge length (GL) and at a local necking zone are compared. The resulting averaged and local material parameters obtained from the proposed model provide interesting insights into the pre and post necking deformation behavior. Our constitutive model would be useful for characterizing highly ductile metals which may or may not depict non-linear strain hardening behavior including their post necking deformations.

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Numerical study on effects of microstructure randomness on fatigue fracture of non-oriented electrical steel

Gothivarekar,

Glodek,

Talemi

2024

Procedia Structural Integrity

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The Influence of Post-Necking Strain Hardening Behaviour on Fatigue Lifetime Prediction of Cold-Formed High Strength Steel.

Cited by 4 publications

References 5 publications

The effect of kinematic hardening on the fatigue behaviour of bent high strength steel

The effect of kinematic hardening on the fatigue behaviour of bent high strength steel

A full-range stress-strain model for metallic materials depicting non-linear strain-hardening behavior

Numerical study on effects of microstructure randomness on fatigue fracture of non-oriented electrical steel

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