Failure characteristics of a dual-phase steel sheet

Björklund, Oscar; Nilsson, Larsgunnar

doi:10.1016/j.jmatprotec.2014.01.004

Cited by 36 publications

(15 citation statements)

References 50 publications

(53 reference statements)

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“…The inverse modelling technique is a suitable approach to calibrate fracture criteria, since not even the simple calibration test specimens experience constant stress triaxialities throughout their loading, cf. Björklund and Nilsson (2014). During different load paths the criteria accumulate damage differently due to their formulations.…”

Section: Fracture Modellingmentioning

confidence: 99%

Finite Element Analysis of Sheet Metal Assemblies: Prediction of Product Performance Considering the Manufacturing Process

Govik¹

2014

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Section: Fracture Modellingmentioning

confidence: 99%

Finite Element Analysis of Sheet Metal Assemblies: Prediction of Product Performance Considering the Manufacturing Process

Govik¹

2014

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“…This influences the material's behaviour and, hence, its macroscale response because of the large plastic strains presented by the ferrite [2]. DP steels exhibit features during large plastic strains that make them distinct from other structural steels [3] to [5]. These features include the complex interaction of strain-hardening behaviour between the two phases, developing stress saturation effects during large strains, and dependence on failure modes by different states of stress, among others [3], [6] and [7].…”

Section: Introductionmentioning

confidence: 99%

Computational and Numerical Analysis of Ductile Damage Evolution under Load-Unload Tensile Test in Dual Phase Steel

2018

SV-JME

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Dual-phase (DP) sheet steels are used in the automotive industry. They have a microstructure that consists of a ferrite matrix with dispersed martensite islands giving a combination of good formability and high strength. However, they also exhibit ductile failure caused mainly by high strain incompatibility in both phases, which continues to be an issue of discussion among researchers. To capture the mechanical degradation of a DP sheet steel, this research focuses on the damage characterization using a continuum damage model and loadingunloading uniaxial tensile tests to quantify ductile failure without incurring expensive and difficult mechanical tests, which has the potential to provide an understanding of the identification of damage parameters in the metal-forming industry. By comparing experimental tests and computation simulations, the model presents minimum errors considering triaxiality as a constant value. Key words: continuum damage mechanics, dual-phase steels, load-unload test Highlights • Progressive deterioration of mechanical strength in a dual-phase steel is investigated by means of indirect measurement of elastic modulus. • The development of a hybrid calibration procedure between conventional experimental tests and numerical simulations to predict mechanical response is assessed. • A coupled isotropic J2 plasticity with hardening saturation and a ductile damage model is used. • Initial fracture takes place in a strain localization region.

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“…Traditionally the ductility of a material at various stress states is established through an experimental-numerical approach where the strain and stress histories from the critical location in the test specimen are found from Finite Element (FE) simulations, e.g. [7,8,[21][22][23][24][25][26]. Optical measurements, using for instance Digital Image Correlation (DIC), could be applied for this purpose, but DIC measurements are limited to provide information about the kinematic fields on the surface of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Strain localization and ductile fracture in advanced high-strength steel sheets

Gruben

Morin

Langseth

et al. 2017

European Journal of Mechanics - A/Solids

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An experimental-numerical approach is applied to determine the strain localization and ductile fracture of high-strength dual-phase and martensitic steel sheet materials. To this end, four different quasi-static material tests were performed for each material, introducing stress states ranging from simple shear to equi-biaxial tension. The tests were analysed numerically with the nonlinear finite element method to estimate the failure strain as a function of stress state. The effect of spatial discretization on the estimated failure strain was investigated. While the global response is hardly affected by the spatial discretization, the effect on the failure strain is large for tests experiencing necking instability. The result is that the estimated failure strain in the different tests scales differently with spatial discretization. Localization analysis was performed using the imperfection band approach, and applied to estimate onset of failure of the two steel sheet materials under tensile loading. The results indicate that a conservative failure criterion for ductile materials may be established from localization analysis, provided strain localization occurs prior to ductile fracture.

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Failure characteristics of a dual-phase steel sheet

Cited by 36 publications

References 50 publications

Finite Element Analysis of Sheet Metal Assemblies: Prediction of Product Performance Considering the Manufacturing Process

Finite Element Analysis of Sheet Metal Assemblies: Prediction of Product Performance Considering the Manufacturing Process

Computational and Numerical Analysis of Ductile Damage Evolution under Load-Unload Tensile Test in Dual Phase Steel

Strain localization and ductile fracture in advanced high-strength steel sheets

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