Determination of the Effect of Stress State on the Onset of Ductile Fracture Through Tension-Torsion Experiments

Papasidero, Jessica; Doquet, Véronique; Mohr, Dirk

doi:10.1007/s11340-013-9788-4

Cited by 74 publications

(28 citation statements)

References 25 publications

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“…We closely follow the experimental procedure for tension-torsion fracture testing proposed by Papasidero et al (2014). Using a dual actuator system, selected combinations of tension and torsion loading are applied to a stocky tubular specimen.…”

Section: Methodsmentioning

confidence: 99%

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

Papasidero

Doquet

Mohr

2015

International Journal of Solids and Structures

192

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International audienceThe effect of stress state and loading path on the ductile fracture of aluminum 2024-T351 is characterized through tension–torsion experiments on tubular specimens. The experimental program includes proportional and non-proportional loading paths leading to the onset of fracture at nearly plane stress conditions at stress triaxialities between 0 and 0.6. Stereo digital image correlation is used to measure the displacements and rotations applied to the specimen shoulders. An isotropic non-quadratic Hosford plasticity model with combined Voce–Swift hardening is used to obtain estimates of the local stress and strain fields within the specimen gage section. The hybrid experimental–numerical results indicate a higher strain to fracture for pure shear than for uniaxial tension. The calibration of a Hosford–Coulomb fracture initiation model suggests that the ductility of aluminum 2024-T351 decreases monotonically as a function of the stress triaxiality, whereas it is a non-symmetric convex function of the Lode angle parameter. It is shown that a simple non-linear damage accumulation rule can describe the effect of non-proportional loading on the strain to fracture

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Section: Methodsmentioning

confidence: 99%

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

Papasidero

Doquet

Mohr

2015

International Journal of Solids and Structures

192

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“…Moreover, with the variations of materials, specimen geometries, boundary conditions and measurement techniques in the literature, different conclusions can be obtained on the characteristics of ductile failure. For instance, the ductile failure strain under low stress triaxiality conditions was found to exhibit a nonmonotonic dependence to the stress triaxiality by Bai and Wierzbicki (2010) and Barsoum and Faleskog (2007), while a monotonic dependence was found by Haltom et al (2013), Ghahremaninezhad and Ravi-Chandar (2013) and Papasidero et al (2014).…”

Section: Introductionmentioning

confidence: 99%

On the description of ductile fracture in metals by the strain localization theory

2017

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“…While at higher stress triaxiality levels available material and numerical models keep the pace at increasing accuracy in predictions of ductile failure mode and critical strains (Gurson 1977;Tvergaard and Needleman 1984;Lemaitre 1992), lower stress triaxiality levels still present serious challenges (Faleskog and Barsoum 2013;Papasidero et al 2014). Ductile damage micromechanisms responsible for crack initiation and propagation in such conditions are still not fully understood.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the link between stress triaxiality, Lode parameter and strain to fracture remains an open question. Even a clear definition on how to measure strain to fracture is not established at present (Papasidero et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Slant strained band development during flat to slant crack transition in AA 2198 T8 sheet: in situ 3D measurements

et al. 2015

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International audienceIn this work 3D strain and damage analyses are performed in the immediate vicinity of the notch root of a at CT-like specimen made of aluminum alloy. Experimental data, partially exploited by Morgeneyer et al (2014b), were obtained by using synchrotron laminography and the 3D reconstructed volumes are subsequently analyzed via Digital Volume Correlation. These data enable for in situ assessments of strain elds and ductile damage in the zone where the stress triaxiality evolves from elevated to lower levels, which is accompanied by at-to-slant crack transition. The measured strain eld patterns in this area are analyzed herein in a systematic manner by studying the incremental strain activity during several loading steps. It is shown that from the very beginning of the loading history multiple slant strained bands appear in front of the notch root while the corresponding damage growth sets in at later loading stages and higher strains. The activity of the dierent strained bands at the notch root is alternating between dierent locations over the loading history. However, the band leading to nal rupture is always active. The region where slant fracture occurs is identied to be in plane strain condition with respect to the crack propagation direction

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Determination of the Effect of Stress State on the Onset of Ductile Fracture Through Tension-Torsion Experiments

Cited by 74 publications

References 25 publications

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

On the description of ductile fracture in metals by the strain localization theory

Slant strained band development during flat to slant crack transition in AA 2198 T8 sheet: in situ 3D measurements

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