Topology and Morphology Influences on the Onset of Ductile Failure in a Two-phase Microstructure

a b s t r a c tThe precise mechanisms underlying the failure of multi-phase materials may be strongly dependent on the material's microstructural morphology. Micromechanical modeling has provided much insight into this dependence, but uncertainties remain about crucial modeling assumptions. This paper assesses the influence of different grain shapes, damage indicators, and stress states using a structured numerical model. A distinct spatial arrangement of phases around fracture incidents is found, consisting of hard regions in the tensile direction interrupted by soft regions in the directions of shear. These key features are only mildly sensitive to the studied variations.

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“…In the case of square grains/elements this occurs only for a single point. See de Geus et al [30] for details.…”

Section: Considered Grain Shapesmentioning

confidence: 99%

Microstructural modeling of ductile fracture initiation in multi-phase materials

Geus

Peerlings

Geers

2015

Engineering Fracture Mechanics

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Defect Sensitivity of Dual-Phase Steels: A Statistical Micromechanical Investigation of the Ductility Loss Due to Preexisting Defects

Rezazadeh

Peerlings²,

Hoefnagels³

et al. 2023

Int J Mult Comp Eng

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As a result of their heterogeneous two-phase microstructure, dual-phase (DP) steels reveal various damage mechanisms leading to the nucleation of voids, microcracks, and other defects at all stages of deformation. Defects may also preexist in the microstructure due to thermomechanical processing of the material. The literature has ample evidence that DP steels, while offering a good compromise between ductility and strength, are sensitive to these types of preexisting defects. However, the quantitative dependency of mechanical properties of DP steels on such preexisting defects is still to be explored. In this paper, a systematic statistical analysis of this sensitivity is carried out using an idealized microstructural model of randomly generated two-phase volume elements with embedded preexisting defects. The proposed model also enables a methodological study probing the influence of mechanical phase contrast (i.e., the hardness difference between the constituent phases) and volume fractions. It is observed that high phase contrast microstructures are less sensitive to initial defects since the inherent extreme heterogeneity of the microstructure leads to the nucleation of new damage incidents irrespective of the presence of preexisting defects. At constant contrast, the volume fraction of the hard phase has less influence. These conclusions are insensitive to the precise type of defect considered.

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Topology and Morphology Influences on the Onset of Ductile Failure in a Two-phase Microstructure

Cited by 2 publications

References 10 publications

Microstructural modeling of ductile fracture initiation in multi-phase materials

Microstructural modeling of ductile fracture initiation in multi-phase materials

Defect Sensitivity of Dual-Phase Steels: A Statistical Micromechanical Investigation of the Ductility Loss Due to Preexisting Defects

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