Journal ArticleDOI
An analysis of the effects of matrix void growth on deformation and ductility in metal-ceramic composites
Reads0
Chats0
TLDR
In this article, the deformation and failure of metal-matrix composites, by the nucleation and growth of voids within the ductile matrix, are studied numerically and experimentally.Abstract:
Deformation and failure of metal-matrix composites, by the nucleation and growth of voids within the ductile matrix, are studied numerically and experimentally. The matrix material is modelled as an elastic-viscoplastic ductile porous solid to characterize the evolution of damage from void formation. The material systems chosen for parametric analyses and for quantitative comparisons between numerical analyses and experiments are aluminum alloys discontinuously reinforced with SiC. The brittle reinforcement phase, in the form of spheres, particulates with sharp corners, or cylindrical whiskers, is modelled as elastic or rigid, with the interfaces between the ductile matrix and the brittle reinforcement assumed to be perfectly bonded. The overall constitutive response of the composite and the evolution of matrix failure are analyzed using finite element models within the context of axisymmetric and plane strain formulations. Detailed parametric analyses of the effects of (i) reinforcement shape, (ii) reinforcement volume fraction, (iii) mechanical properties of the matrix, (iv) nucleation strain and volume fraction of void-nucleating particles, and (v) reinforcement distribution on the overall deformation and ductility of the composite are discussed. The numerical predictions of yield strength, strain hardening exponent and ductility for the composites with different volume fractions of SiC particulates are also compared with experimental measurements.read more
Citations
More filters
Journal ArticleDOI
Microstructurally inhomogeneous composites: Is a homogeneous reinforcement distribution optimal?
L.J. Huang,L. Geng,H-X. Peng +2 more
TL;DR: In this paper, a range of uniquely multi-scale hierarchical structures have been successfully designed and fabricated by tailoring reinforcement distribution for discontinuous metal matrix composites in order to obtain superior performance.
PatentDOI
Metal matrix composites
TL;DR: In this article, a ceramic-reinforced aluminum matrix composite is formed by contacting a molten aluminum-magnesium alloy with a permeable mass of ceramic material in the presence of a gas comprising from about 10 to 100% nitrogen, by volume, balance non-oxidizing gas, e.g., hydrogen or argon.
Journal ArticleDOI
Size dependent strengthening in particle reinforced aluminium
M. Kouzeli,Andreas Mortensen +1 more
TL;DR: The tensile behavior of composites produced by infiltrating ceramic particle beds with high purity (99.99%) is studied as a function of reinforcement size and chemistry (Al2O3 and B4C) as mentioned in this paper.
Journal ArticleDOI
Functionally graded metals and metal-ceramic composites: Part 2 Thermomechanical behaviour
Subra Suresh,Andreas Mortensen +1 more
TL;DR: In this article, a review of the processing of functionally graded metals and metal-ceramic composites is presented, focusing on the thermomechanical behavior of the materials. But the authors do not consider the deformation of the constituent phases of the composites.
Journal ArticleDOI
Development of high performance magnesium nano-composites using nano-Al2O3 as reinforcement
Syed Fida Hassan,Manoj Gupta +1 more
TL;DR: In this paper, the effect of presence of nano-Al2O3 as reinforcement and its increasing amount with the microstructural and mechanical properties of magnesium nano-composites was investigated.
References
More filters
Journal ArticleDOI
Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media
Journal ArticleDOI
A variational approach to the theory of the elastic behaviour of multiphase materials
Zvi Hashin,S. Shtrikman +1 more
TL;DR: In this paper, the authors derived upper and lower bounds for the effective elastic moduli of quasi-isotropic and quasi-homogeneous multiphase materials of arbitrary phase geometry.
Journal ArticleDOI
A self-consistent mechanics of composite materials
TL;DR: In this article, the elastic moduli of two-phase composites are estimated by a method that takes account of the inhomogeneity of stress and strain in a way similar to the Hershey-Kroner theory of crystalline aggregates.
Journal ArticleDOI
Analysis of the cup-cone fracture in a round tensile bar
Viggo Tvergaard,Alan Needleman +1 more
TL;DR: In this article, a set of elastic-plastic constitutive relations that account for the nucleation and growth of micro-voids is used to model the failure of a round tensile test specimen.
Journal ArticleDOI
Influence of voids on shear band instabilities under plane strain conditions
TL;DR: In this paper, the effect of microscopic voids on the failure mechanism of a ductile material is investigated by considering an elastic-plastic medium containing a boubly periodic array of circular cylindrical voids.