Journal ArticleDOI
Effect of fibre debonding in a whisker-reinforced metal
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TLDR
In this article, the debonding behaviour at the interface is represented in terms of a cohesive zone model that describes decohesion by normal separation and tangential separation, and the effect of friction during pullout is included in the model.Abstract:
For a whisker-reinforced metal matrix composite, failure by decohesion of the fibre-matrix interface is analysed. The unit-cell model applied for the numerical analyses represents a periodic array of aligned fibres, where neighbouring fibres are somewhat shifted relative to one another. The debonding behaviour at the interface is represented in terms of a cohesive zone model that describes decohesion by normal separation as well as decohesion by tangential separation. The predicted failure initiates by void formation near the sharp edges at the fibre ends, and subsequently fibre pull-out is described. The effect of friction during pull-out is included in the model.read more
Citations
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Numerical simulations of fast crack growth in brittle solids
Xiaopeng Xu,Alan Needleman +1 more
TL;DR: In this article, a model of dynamic crack growth is presented for a plane strain block with an initial central crack subject to tensile loading, where crack branching emerges as a natural outcome of the initial-boundary value problem solution, without any ad hoc assumption regarding branching criteria.
Journal ArticleDOI
The relation between crack growth resistance and fracture process parameters in elastic-plastic solids
TL;DR: In this article, an elastic-plastic solid with an idealized traction separation law specified on the crack plane to characterize the fracture process is computed for small-scale yielding as dependent on the parameters characterizing the elasticplastic properties of the solid and its fracture process.
Book
The Variational Approach to Fracture
TL;DR: In this article, a weak variational evolution is proposed for 1D traction on a fiber reinforced matrix, and a variational formulation for fatigue is presented, which is based on the soft belly of Griffith's formulation.
Journal ArticleDOI
Void nucleation by inclusion debonding in a crystal matrix
Xiaopeng Xu,Alan Needleman +1 more
TL;DR: In this article, a numerical micromechanical study of void nucleation is presented, where constitutive relations are specified independently for the matrix, the void-nucleating particles and the interface.
Journal ArticleDOI
The influence of plasticity on mixed mode interface toughness
TL;DR: In this article, a potential function of the components of the crack face displacements is used to generate the tractions along the interface where the fracture processes causing separation occur, and the two main parameters characterizing this potential are the work of separation per unit area and a peak normal stress.
References
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Journal ArticleDOI
A Continuum Model for Void Nucleation by Inclusion Debonding
TL;DR: In this paper, a boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardening elastic-viscoplastic matrix is analyzed and the effect of the triaxiality of the imposed stress state on nucleation is studied and the numerical results are related to the description of void nucleation within a phenomenological constitutive framework.
A continuum model for void nucleation by inclusion debonding
TL;DR: In this article, a boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardening elastic-viscoplastic matrix is analyzed and the effect of the triaxiality of the imposed stress state on nucleation is studied and the numerical results are related to the description of void nucleation within a phenomenological constitutive framework.
Journal ArticleDOI
An experimental and numerical study of deformation in metal-ceramic composites
TL;DR: In this article, the deformation characteristics of ceramic whisker- and particulate-reinforced metal-matrix composites were studied experimentally and numerically with the objective of investigating the dependence of tensile properties on the matrix microstructure and on the size, shape, and distribution of the reinforcement phase.
Journal ArticleDOI
Analysis of stress-strain, fracture, and ductility behavior of aluminum matrix composites containing discontinuous silicon carbide reinforcement
TL;DR: In this paper, the elastic modulus of aluminum matrix composites was found to be isotropic to be independent of type of reinforcement, and to be controlled solely by the volume percentage of SiC reinforcement present.
Journal ArticleDOI
An experimental study of the fracture resistance of bimaterial interfaces
H.C. Cao,A.G. Evans +1 more
TL;DR: In this article, the fracture resistance of a model bimaterial interface has been measured for a wide range of phase angles: the measure of the relative crack face sliding and opening displacement near the crack tip.