Assessment of models used to predict the strength of discontinous silicon carbide reinforced aluminum alloys

Nardone, Vincent C.

doi:10.1016/0036-9748(87)90105-0

Cited by 155 publications

(43 citation statements)

References 11 publications

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“…In this condition, the interfacial shear stress causing the load transfer is a constant value, which is generally assumed to be one half of flow stress of the matrix. 14,15 Then, the average normal stress, f , in the loading direction of a cylindrical whisker is given by…”

Section: A Shear-lag Modelmentioning

confidence: 99%

“…Nevertheless, the modified shear-lag model still overestimates the yield strength in the longitudinal direction and underestimates it in the transverse direction, mainly because of the assumption of perfect alignment of reinforcement. 15 The short fibers and whiskers in extruded MMCs are not perfectly aligned in matrix but instead are misaligned with a range of misorientation angle from the extrusion axis. These misaligned short fibers and whiskers affect the load-transfer efficiency of reinforcement.…”

Section: Introductionmentioning

confidence: 99%

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Generalized shear-lag model for load transfer in SiC/Al metal-matrix composites

2003

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The load-transfer efficiency of reinforcement, in cylindrical forms in metal-matrix composite (MMC), was analyzed based on the shear-lag model. Both the geometric shape and alignment of reinforcement were considered. The stress transferred to a misaligned whisker was calculated from differential equations based on the force equilibrium in longitudinal and transverse directions. A new parameter, defined as effective aspect ratio, was used to indicate the load-transfer efficiency of misaligned reinforcement. The effective aspect ratio was formulated as a function of aspect ratio and misorientation angle of reinforcement in MMC. A probability density function of misorientation distribution was used to estimate the strengthening effect of all misaligned whiskers distributed in the matrix. Considering the contributions of both effective aspect ratio and misorientation distribution on load-transfer efficiency, a generalized shear-lag model was proposed to explain the mechanical anisotropy of discontinuous reinforced MMC.

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Section: A Shear-lag Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generalized shear-lag model for load transfer in SiC/Al metal-matrix composites

2003

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“…Models have been developed to determine the increase in strength due to these dislocations. Several investigations reviewed and compared the predictions of shear lag and dislocation models but without being able to reach a consensus [3,4]. It is still unclear whether load transfer or matrix microstructure is the main source of strengthening.…”

Section: Introductionmentioning

confidence: 99%

“…A modified version of the basic discontinuous composite strengthening model, based on load transfer by shear (shear lag model), was proposed by Nardone and Prewo [2,3] in which a term was incorporated to account for tensile stress transfer at fibre ends when aspect ratios are low (modified shear lag model). Their calculations were related to experimental observations made on a P/M 20 Vf % SIC/6061 composite and gave good predictions of the yield strength.…”

Section: Introductionmentioning

confidence: 99%

Strengthening mechanisms in whisker-reinforced aluminium composites

Voituriez

Hall

1991

J Mater Sci

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Silico'n carbide whisker reinforced aluminium alloys were mechanically tested in the as-cast and heat treated conditions; the microstructures were examined by transmission electron microscopy. The mechan~c_al properties were strongly dependent upon the nature of the matrix alloying elements, the heat treatment conditions and the processing routes. AI-Cu and AI 6061 reinforced alloys were very responsive to heat treatment while AI-Mg and AI-Si reinforced alloys were not. The microstructures and mechanical properties were analysed in an attempt to determine the operative strengthening mechanisms and deformation processes. Three distinct types of matrix microstructure were observed, distinguished by the presence or absence of subgrains and/or precipitates. Using these observations, the composite properties could be quite well modelled using dislocation theories, indicating that the matrix microstructure dominates the mechanical properties.

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“…The concept of grain refinement through additional carbon contents has been supported by several authors (V. C. Nardone, 1987;G. T. Terlinde, 1983) as they have all pointed out the reduction of ductility for alloys without carbon contents is actually caused by the formation of α precipitates around β grain boundaries, and that by adding C may improve the ductility by restricting α growth.…”

Section: β Grain Refinement Mechanisms Bymentioning

confidence: 93%

Control of titanium carbide in the alloys

Wang¹

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Assessment of models used to predict the strength of discontinous silicon carbide reinforced aluminum alloys

Cited by 155 publications

References 11 publications

Generalized shear-lag model for load transfer in SiC/Al metal-matrix composites

Generalized shear-lag model for load transfer in SiC/Al metal-matrix composites

Strengthening mechanisms in whisker-reinforced aluminium composites

Control of titanium carbide in the alloys

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