Journal ArticleDOI
Fatigue crack growth in fiber-reinforced metal-matrix composites
Gang Bao,Robert M. McMeeking +1 more
TLDR
In this paper, the authors modeled fatigue crack growth in fiber-reinforced metal-matrix composites based on a crack tip shielding analysis, where the fiber/matrix interface is assumed to be weak, allowing interfacial debonding and sliding to occur readily during matrix cracking.Abstract:
Fatigue crack growth in fiber-reinforced metal-matrix composites is modeled based on a crack tip shielding analysis. The fiber/matrix interface is assumed to be weak, allowing interfacial debonding and sliding to occur readily during matrix cracking. The presence of intact fibers in the wake of the matrix crack shields the crack tip from the applied stresses and reduces the stress intensity factors and the matrix crack growth rate. Two regimes of fatigue cracking have been simulated. The first is the case where the applied load is low, so that all the fibers between the original notch tip and the current crack tip remain intact. The crack growth rate decreases markedly with crack extension, and approaches a “steady-state”. The second regime occurs if the fibers fail when the stress on them reaches a unique fiber strength. The fiber breakage reduces the shielding contribution, resulting in a significant acceleration in the crack growth rate. It is suggested that a criterion based on the onset of fiber failure may be used for a conservative lifetime prediction. The results of the calculations have been summarized in calibrated functions which represent the crack tip stress intensity factor and the applied load for fiber failure.read more
Citations
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Journal ArticleDOI
Titanium metal matrix composites: An overview
TL;DR: Titanium matrix composites (TMCs) offer high specific strength and stiffness compared with steel and nickel-base materials as mentioned in this paper, and can offer up to 50% weight reduction relative to monolithic superalloys.
Journal ArticleDOI
Creep models for metal matrix composites with long brittle fibers
Z.-Z. Du,Robert M. McMeeking +1 more
TL;DR: In this paper, the authors extended the work of McLean (1985) to include effects of fiber breaks and the consequential stress relaxation in the broken fibers, and calculated the creep strain and the creep rupture time when global load sharing occurs.
Journal ArticleDOI
Crack bridging models for fiber composites with slip-dependent interfaces
TL;DR: In this paper, the role of slip-dependent interfaces in fracture of fiber reinforced composites was investigated and three interface models were proposed to correlate τ with the interfacial sliding displacement.
Journal ArticleDOI
The role of metal plasticity and interfacial strength in the cracking of metal/ceramic laminates
Yonggang Huang,H.W. Zhang +1 more
TL;DR: In this article, two models based on elastic-plastic fracture mechanics and fiber bridging are developed to study the role of plastic yielding in metals and the interfacial strength of metal/ceramic laminates.
Journal ArticleDOI
Interface effects on crack deflection and bridging during fatigue crack growth of titanium matrix composites
TL;DR: In this article, the effect of the interface on the crack deflection and crack bridging behavior of continuous fiber-reinforced titanium matrix composites has been investigated using three interfaces with significantly different mechanical characteristics.
References
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Journal ArticleDOI
A Path Independent Integral and the Approximate Analysis of Strain Concentration by Notches and Cracks
TL;DR: In this paper, an integral is exhibited which has the same value for all paths surrounding a class of notches in two-dimensional deformation fields of linear or non-linear elastic materials.
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The mechanics of matrix cracking in brittle-matrix fiber composites
TL;DR: In this paper, the authors evaluated the stress for matrix cracking in brittle-matrix fiber composites using a stress intensity approach, in which the influence of the fibers that bridge the matrix crack is represented by closure tractions at the crack surfaces.
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Models of fiber debonding and pullout in brittle composites with friction
TL;DR: In this article, the debonding process of a fiber embedded in a brittle matrix is modeled as a mode 2 crack, where the elastic properties of the fiber are assumed to be transversely isotropic about the fiber axis.
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Measurement of Interfacial Mechanical Properties in Fiber‐Reinforced Ceramic Composites
TL;DR: In this paper, a methode d'indentation dans laquelle un indenteur pyramidal est utilise for pousser les fibres and provoquer un glissement a l'interface fibre/matrice.
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Small-scale crack bridging and the fracture toughness of particulate-reinforced ceramics
TL;DR: In this paper, a theoretical analysis of small-scale bridging of crack surfaces by elastic-ideally plastic springs is presented and applied to the study of the fracture toughness of ceramics reinforced by small particles.