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

Roatta, A.; Bertinetti, M. A.; Turner, P. A.; Bolmaro, R.E.

doi:10.1007/s11661-999-0125-6

Cited by 3 publications

(2 citation statements)

References 37 publications

(32 reference statements)

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“…3). That the specific shape of low aspect ratio reinforcements does not significantly influence the elastic properties of composite materials has been shown explicitly in the literature both by analytical [61] and numerical models [62][63][64]. The yield stress of the present composites exhibits a strong dependence on reinforcement size, Fig.…”

Section: Young's Modulus and Yield Stresssupporting

confidence: 58%

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

et al. 2001

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Abstract-Particle reinforced composites are produced by infiltrating Al 2 O 3 particle beds with high purity Al (99.99%). These materials feature 40-60 vol. pct reinforcement homogeneously distributed in a pore-free matrix. Their tensile behaviour is studied as a function of reinforcement size and shape. Internal damage, in the form of particle fracture and matrix voiding, occurs from the onset of plastic straining. Its evolution with strain is monitored through changes in (i) stiffness and (ii) peak stress after incremental plastic straining and annealing. The influence of damage on the flow curves of the composites can be accounted for using basic postulates of continuum damage mechanics. Failure strains vary between 2 and 4%, and are a function of the rate of damage accumulation. An expression is derived to predict elongation to failure of damaging materials that fail by tensile instability, which gives good agreement with the experimental observations. 

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Section: Young's Modulus and Yield Stresssupporting

confidence: 58%

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

et al. 2001

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“…Another advantage is that the DA can be extended to be used in a nonlinear problem (Roatta et al 1998). As mentioned earlier, the current explicit solution allows us to solve the problem as a function of the deformation ® eld to obtain the interaction ® eld " int .…”

Section: Introductionmentioning

confidence: 99%

Explicit method for calculating the effective properties and micromechanical stresses: an application to an alumina-SiC composite

TURNER¹

1999

Philosophical Magazine A

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High-temperature processing induces large internal stresses at room temperature in composites because of the di erence between the thermal coe cients of the matrix and of the reinforcing particles. In this work we develop a theoretical scheme to calculate the strains in the particles by using the Eshelby equivalent method. The interaction between the inhomogeneous inclusions (® bres) is evaluated by means of a mean-® eld model given by Mori and Tanaka, and full anisotropy of ® bres and matrix is taken into account within an explicit approach by which the problem is solved as a function of the deformation ® eld instead of the thermoelastic properties. The model is applied to the thermoelastic moduli and residual stresses in biphase composites. We analyse the in¯uence of the orientation distribution function of ® bres, its volume fraction and elastic inhomogeneity factor on Young' s modulus, Poisson' s ratio and the thermal coe cients. We calculate the thermal residual stresses in an Al 2 O 3 -SiC composite as a function of direction, and the results are compared with the neutron measurements made by Majundar et al. As the non-uniform crystal structure of SiC whiskers complicates the interpretation of experimental data collected from whisker-reinforced composites, a general equation based on the fractions of cubic and hexagonal polytypes is incorporated in the model. We demonstrate that the residual stresses cannot easily be explained on the basis of elastic interactions and distribution of ® bre orientations, even accounting for the elastic and thermal anisotropy of ® bres. Correct interpretation and comparison of residual stresses with the measured values requires analysis of the peak shift and broadening stemming from the residual stresses. §1. IntroductionIn the past two decades, there has been increased interest in strengthening and toughening polycrystalline ceramics by the incorporation of ® bres and particles within the microstructure. The addition of ® bres to a ceramic or metal matrix makes it possible to enhance both the mechanical and thermal properties of the resulting composite. These properties will depend on the relative sti nesses (elastic inhomogeneity factor) and thermal moduli (thermal inhomogeneity factor) of the matrix and of the ® bres, and on the volume fraction, geometry and distribution of

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Strain hardening behaviour and temperature effect on Al-2124/SiCp

Martín

Forn

Nogué

2003

Journal of Materials Processing Technology

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

Cited by 3 publications

References 37 publications

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

Explicit method for calculating the effective properties and micromechanical stresses: an application to an alumina-SiC composite

Strain hardening behaviour and temperature effect on Al-2124/SiCp

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