Tensile properties of short fiber-reinforced SiC/Ai composites: Part I. effects of matrix precipitates

Papazian, John M.; Adler, P. N.

doi:10.1007/bf02782420

Cited by 135 publications

(24 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In that sense, it is superior to the classic self-consistent models. Under the pct SiC reinforcements, calculated with the model, is in agreement with the values as a function of volume fraction current general scheme, the incorporation of other microscopic phenomena seems to be just a matter of computational measured by Papazian and Adler [24] and Levy and Papazian [26] (Table IV). That is, there is a sudden decrement of effort.…”

Section: Yield Strainmentioning

confidence: 57%

“…High-temperature relaxation (FEM) techniques, and have found this factor to have a great influence over the macroscopic properties. [23][24][25][26][27][28][29] Nevertheless, the agreement between currently calculated and experimental residual stresses is rather good, as can be seen in Smith et al [30] measured residual stresses at room temper- Sun et al [31] ray diffraction methods. For almost-round particle reinforce-229 229…”

Section: A Coefficients Of Thermal Expansionmentioning

confidence: 94%

See 1 more Smart Citation

Influence of the localized initial plastic deformation on the effective thermomechanical response of metal-matrix composites

Roatta

Bertinetti

Turner

et al. 1999

Metall Mater Trans A

View full text Add to dashboard Cite

A generalized Eshelby model, allowing interaction among reinforcing particles under a Mori-Tanakalike scheme, is presented. Different inclusion aspect ratios are studied in the elastic and incipient elastoplastic regime for a model SiC-Al composite. The solution of the field equations is obtained via an explicit algorithm that yields the interaction field in terms of the stress and strain variables. The particles and fibers are taken as purely elastic, and the matrix is regarded as elastic-perfectly plastic. Coefficients of thermal expansion (CTE) are calculated both under the assumption of purely elastic response and at the onset of plastic localized deformation. The simulated stress-strain curves show the influence of interaction stresses on macroscopic yield stress for different inclusion aspect ratios, with no consideration of matrix hardening. The model allows a good simulation of the thermomechanical behavior of composite materials and contributes to the understanding of the elastoplastic transition in stress-strain curves. It can also simply explain some of the most distinctive features of the mechanical behavior of composites. The model presents the possibility of controlling many input variables and geometries and simultaneously considering three-dimensional deformation of interacting inclusion-reinforced materials with low computational effort. Comparisons to experimental CTE and residual stresses are provided.

show abstract

Section: Yield Strainmentioning

confidence: 57%

Section: A Coefficients Of Thermal Expansionmentioning

confidence: 94%

Influence of the localized initial plastic deformation on the effective thermomechanical response of metal-matrix composites

Roatta

Bertinetti

Turner

et al. 1999

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…The extend of the weak zone around the fibre is indicated by the dotted line. [22] and s r of about 4 [8,23]. The predictions from the various models are compared with these data in Fig .…”

Section: Formulationmentioning

confidence: 99%

Shear lag models for discontinuous composites: fibre end stresses and weak interface layers

Starink

Syngellakis

1999

Materials Science and Engineering: A

View full text Add to dashboard Cite

A new shear lag (SL) type model for stress transfer in a composite with cylindrical fibres is derived. It accounts for fibre end stresses in an approximate yet realistic manner, and leads to a new formula for predicting the Young's modulus of the composites. The predictions of this model were found to agree well with data for metal matrix composites (MMCs) with fibres of various aspect ratios. The accuracy and relative simplicity of the new model have been exploited in the development of an approximate analytical model for the stress transfer and macroscopic yield stress of a composite that contains a weak layer in the matrix adjacent to the reinforcement. With the aid of the latter model, the proof stress of MMCs which contain a precipitate free zone (PFZ) around the reinforcement, can be studied; experimental data obtained for aged 8090 MMCs is consistent with the model predictions.

show abstract

“…In this case (age-hardenable composites), the strengthening will depend on the size and distribution of the age-hardening particles and on their interactions with the dislocations present in the matrix of the composite. The importance of the matrix precipitates in increasing the strength has also been demonstrated by Papazian and Adler [1].…”

Section: Discussionmentioning

confidence: 83%

“…The basic strengthening mechanisms which are believed to occur are load transfer (from the matrix to the whiskers), precipitation hardening (in age-hardenable alloys), dispersion hardening (due to the whiskers), high dislocation density (generated at the interface), and residual elastic stresses (generated at the interface). Because a good overview of the different strengthening theories in short fibrereinforced SiC/A1 was recently given by Papazian and Adler [1], they will only be briefly summarized here.…”

Section: Introductionmentioning

confidence: 99%

Strengthening mechanisms in whisker-reinforced aluminium composites

Voituriez

Hall

1991

J Mater Sci

View full text Add to dashboard Cite

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.

show abstract

Tensile properties of short fiber-reinforced SiC/Ai composites: Part I. effects of matrix precipitates

Cited by 135 publications

References 27 publications

Influence of the localized initial plastic deformation on the effective thermomechanical response of metal-matrix composites

Influence of the localized initial plastic deformation on the effective thermomechanical response of metal-matrix composites

Shear lag models for discontinuous composites: fibre end stresses and weak interface layers

Strengthening mechanisms in whisker-reinforced aluminium composites

Contact Info

Product

Resources

About