Fracture of austenitic steel subject to a wide range of stress triaxiality ratios and crack deformation modes

Trattnig, Gernot; Antretter, Thomas; Pippan, Reinhard

doi:10.1016/j.engfracmech.2007.03.021

Cited by 43 publications

(15 citation statements)

References 12 publications

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“…For example, studies in austenitic steel show that effective plastic strain decreases exponentially with increasing stress triaxiality ratio at fracture [30]. The triaxiality ratio is defined in terms of stress differences by…”

Section: Microstructurally-sensitive Stress Quantities and Experimentmentioning

confidence: 99%

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

et al. 2016

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High resolution EBSD studies on a deformed copper polycrystal have been carried out to quantify the microstructural residual stress distributions, and those of stress state including triaxiality of importance in defect nucleation studies. Crystal plasticity analysis of a representative, similarly textured, model polycrystal has been carried out showing that the experimental distributions of microstructural residual stress components, effective stress, hydrostatic stress and stress triaxiality are well captured.The crystal model enables point-wise microstructural Schmid factors to be calculated both globally (ie with respect to the macroscopic remote loading) and locally from full knowledge of the grain-level stress state. Significant differences are demonstrated such that global Schmid analysis tends to overestimate slip activity and the frequency of high Schmid factors, indicating that the local microstructural heterogeneity is significant and caution is necessary in interpreting polycrystal behaviour using global Schmid factors. A stored energy criterion for fatigue crack nucleation indicates that preferential sites for fatigue crack nucleation are local to grain boundaries (as opposed to triple junctions), and that hard-soft grain interfaces where high GND densities develop are preferable.

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Section: Microstructurally-sensitive Stress Quantities and Experimentmentioning

confidence: 99%

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

et al. 2016

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“…3-5) the aforementioned discontinuity observed by Bao and Wierzbiki [1] in an aluminium alloy could not be confirmed for these three materials. It is worth mentioning that the same result has been found by Tratting [8]. In the diagrams it has been sketched the fitting obtained using the expected locus as predicted by a CDM damage model proposed by Bonora [3].…”

Section: Formability Diagrammentioning

confidence: 55%

Experimental Study of the Effect of Triaxiality Ratio on the Formability Limit Diagram and Ductile Damage Evolution in Steel and High Purity Copper

Chiantoni¹,

Bonora

Ruggiero

2010

Int J Mater Form

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In this contribution, the effect of the stress state (by mean of the triaxiality ratio) on the equivalent plastic strain at fracture is experimentally investigated for different steels and high purity copper in the range of triaxiality from 0 (pure torsion) up to 1.2. This range of stress state is particularly meaningful for the majority of the mechanical applications. The prediction on the formability limit diagram for proportional loading paths (i.e. with constant triaxiality) is verified in the framework of Continuum Damage Mechanics (CDM) using the LemaitreChaboche's damage model. Furthermore the influence on triaxiality on the threshold plastic strain for damage initiation and for the critical damage at rupture is experimentally studied. The results are compared with the prediction of the aforementioned damage model. A very good agreement between experimental results and CDM prediction is achieved.

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“…To explain the results presented in the previous sections and, in particular, the dependency of ductility on specimen width, it is necessary to know the evolution of T with plastic strain for the different tensile tests [29,30]. Such information can be obtained by FE analysis which was demonstrated to correctly model the fracture process for this class of alloys [31,32].…”

Section: Discussionmentioning

confidence: 96%

“…In engineering alloys, void nucleation is induced by the fracture of particles present in the microstructure, or by their decohesion from the matrix. The following void growth is largely influenced by the stress triaxiality [23][24][25][26][27][28][29][30]. A simple and widely used relationship for e eq,g was introduced by McClintock, Rice and Tracey [23,24]:…”

Section: Discussionmentioning

confidence: 99%

Influence of specimen width on the deformation and fracture behaviour of AA5182 sheets

Straffelini

Fontanari

Zadra

2013

Engineering Fracture Mechanics

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Fracture of austenitic steel subject to a wide range of stress triaxiality ratios and crack deformation modes

Cited by 43 publications

References 12 publications

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

Experimental Study of the Effect of Triaxiality Ratio on the Formability Limit Diagram and Ductile Damage Evolution in Steel and High Purity Copper

Influence of specimen width on the deformation and fracture behaviour of AA5182 sheets

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