Effective plastic response of two-phase composites

Shen, Yansong; Finot, M.; Needleman, A.; Suresh, S.

doi:10.1016/0956-7151(94)00346-j

Cited by 108 publications

(45 citation statements)

References 32 publications

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“…They have also presented the effect of the reinforcement distribution effect using the plane strain formulation for whisker shapes. Shen et al (1995) presented similar investigations on AI-5%wt Cu reinforced with 20%…”

Section: C) Homogenization Methodmentioning

confidence: 85%

“…Tvergaard ( Micromechanical modeling has also been used by Christman et al (1989), Llorca et al (1991), Shen et al (1994) and Shen et al (1995) to model the behavior ofmetal-matrix composite materials. Christman et al (1989) have used axisymmetric and plane strain formulations of unit cells to capture the behavior of2124 Al-SiC composite material with whisker and spherical SiC inclusions.…”

Section: C) Homogenization Methodmentioning

confidence: 99%

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Micromechanical modeling of dual phase steels

Al-Abbasi

Nemes

2003

International Journal of Mechanical Sciences

138

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Section: C) Homogenization Methodmentioning

confidence: 85%

Section: C) Homogenization Methodmentioning

confidence: 99%

Micromechanical modeling of dual phase steels

Al-Abbasi

Nemes

2003

International Journal of Mechanical Sciences

138

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“…The maximum principal initiation and that, since the stress in the inclusion was stress (if it is tensile) is a parameter chosen for quantifying reduced for the composite material, the cyclic life was the propensity of brittle fracture. [39,41] Because the maximum extended. While that argument remains valid for composites principal stress field in the inclusion is nonuniform, the with identical reinforcement volume fraction (and, thus, the magnitude averaged over the inclusion volume was used in same elastic moduli) but with lower-strength matrices, the obtaining the stress-enhancement ratio.…”

Section: B Tensile Propertiesmentioning

confidence: 98%

“…A Poisson's ratio of 0.251, cell model to describe the role of SiC reinforcement on stress obtained from a preliminary analysis using the axisymmetric enhancement within rogue inclusions. [21] Here, we seek to unit-cell model, [39,40] with SiC being the discrete particle analyze the influence of matrix microstructure on the stress and Al being the continuous matrix, was used for the current level in inclusions for 2080-T8/SiC/30 p composites, to ratioAl/SiC mixture. This is because the Poisson's ratio cannot nalize the experimental observation of decreasing fatigue be extracted from the experimental stress-strain curve.…”

Section: B Tensile Propertiesmentioning

confidence: 99%

The effect of matrix microstructure on the tensile and fatigue behavior of SiC particle-reinforced 2080 Al matrix composites

Chawla

Habel

Shen

et al. 2000

Metall Mater Trans A

101

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The effect of matrix microstructure on the stress-controlled fatigue behavior of a 2080 Al alloy reinforced with 30 pct SiC particles was investigated. A thermomechanical heat treatment (T8) produced a fine and homogeneous distribution of SЈ precipitates, while a thermal heat treatment (T6) resulted in coarser and inhomogeneously distributed SЈ precipitates. The cyclic and monotonic strength, as well as the cyclic stress-strain response, were found to be significantly affected by the microstructure of the matrix. Because of the finer and more-closely spaced precipitates, the composite given the T8 treatment exhibited higher yield strengths than the T6 materials. Despite its lower yield strength, the T6 matrix composite exhibited higher fatigue resistance than the T8 matrix composite. The cyclic deformation behavior of the composites is compared to monotonic deformation behavior and is explained in terms of microstructural instabilities that cause cyclic hardening or softening. The effect of precipitate spacing and size has a significant effect on fatigue behavior and is discussed. The interactive role of matrix strength and SiC reinforcement on stress within "rogue" inclusions was quantified using a finite-element analysis (FEA) unit-cell model.

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“…Enhanced dislocation mobility, in turn, the composites. [36][37][38][39][40][41][42][43][44][45][46][47] The level of matrix constraint increases improves the tensile ductility and fracture toughness of the with increasing volume fractions of the hard phase. In addisolid-solution alloys.…”

Section: Introductionmentioning

confidence: 99%

Delineating brittle-phase embrittlement and ductile-phase toughening in Nb-based in-situ composites

Chan¹,

Davidson²

2001

Metall Mater Trans A

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The fracture toughness of Nb-based in-situ composites typically decreases with increasing volume fractions of hard intermetallic phases, despite the presence of a ductile niobium solid-solution phase in the microstructure. For composites with a continuous intermetallic matrix, the fracture toughness can be more than double that of the monolithic intermetallics, but is still low in absolute terms, indicating that the solid-solution phase is not very effective in inducing ductile-phase toughening. The lack of enhancement of the fracture resistance appears to arise from an embrittlement effect instigated by the brittle phases in the microstructure, whose nondeformability results in a high plastic constraint acting on the ductile phase. In this article, an analytical model is developed for treating both brittle-phase embrittlement and ductile-phase toughening in terms of constituent properties and microstructural variables. The model is then used to (1) delineate brittle-phase embrittlement and ductile-phase toughening in Nb-based in-situ composites, and (2) design fracture-resistant in-situ composites based on Nb-Ti-Cr, Nb-Ti-Al, and Nb-Ti-Si systems.

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Effective plastic response of two-phase composites

Cited by 108 publications

References 32 publications

Micromechanical modeling of dual phase steels

Micromechanical modeling of dual phase steels

The effect of matrix microstructure on the tensile and fatigue behavior of SiC particle-reinforced 2080 Al matrix composites

Delineating brittle-phase embrittlement and ductile-phase toughening in Nb-based in-situ composites

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