Small-scale crack bridging and the fracture toughness of particulate-reinforced ceramics

Budiansky, Bernard; Amazigo, John C.; Evans, A.G.

doi:10.1016/s0022-5096(98)90003-5

Cited by 367 publications

(97 citation statements)

References 6 publications

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“…It is reported that an increase in fracture toughness can be achieved by crack deflection and crack bridging. [11][12][13] Therefore, it is observed that the resistance to crack propagation by the particles causes the increase in the fracture toughness. In addition, the crack propagation was slowed with the increasing volume fraction of particles and affected as well by the surface energy, particle shape and size as well as the particle-matrix interface.…”

Section: Resultsmentioning

confidence: 99%

Precompaction Effects on Density and Mechanical Properties of Al2O3 Nanopowder Compacts Fabricated by Magnetic Pulsed Compaction

et al. 2009

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In this study, the effects of precompaction on the density, microstructure, mechanical and electrical properties of -Al 2 O 3 bulks fabricated by the combined application of magnetic pulsed compaction (MPC) and a sintering process were reported. The obtained density of the -Al 2 O 3 bulks prepared by the combined processes increased with the increasing MPC pressure and precompaction pressure. The resultant higher hardness and breakdown voltage of the consolidated bulks following combined application of the magnetic pulsed compaction, precompaction and sintering process could be attributed to the homogeneously distributed ultra-fine microstructure than that of general processing, suggesting that the grain growth was remarkably reduced during the MPC processes.

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Section: Resultsmentioning

confidence: 99%

Precompaction Effects on Density and Mechanical Properties of Al2O3 Nanopowder Compacts Fabricated by Magnetic Pulsed Compaction

et al. 2009

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“…The local stress intensity factor at the crack tip, K tip , is comprised of the applied K due to the remote load and the shielding term, K s , resulting from the compressive transformation stresses induced by oxide formation ahead of the crack tip, as given by [37] …”

Section: B K Th For Crack-tip Oxide Fracturementioning

confidence: 99%

Time-Dependent Crack Growth Thresholds of Ni-Base Superalloys

Chan

2014

Metall Mater Trans A

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A micromechanical model has been developed for predicting the time-dependent crack growth threshold and its variability by considering oxide formation or cavity formation ahead of an elastic crack subjected to a sustained load at a stress intensity factor, K, at elevated temperatures in air. It is demonstrated that stress relaxation associated with a volume-expansion process such as the formation of creep cavities or oxides with a positive transformation strain can induce residual stresses at the tip of the elastic crack. The near-tip residual stresses must be overcome by the external load, thereby instigating a growth threshold, K th , for the onset of time-dependent crack growth. This micromechanical framework provides the basis for developing appropriate predictive models for the time-dependent crack growth thresholds associated with several damage processes, including (1) oxidation-assisted intergranular crack growth, (2) K-controlled creep crack growth along an intergranular path, and (3) stress corrosion cracking. The micromechanical threshold models have been utilized to predict the time-dependent crack growth thresholds of a variety of Ni-base superalloys. The material parameters that contribute to the variability of the time-dependent crack growth thresholds have been identified and related to variations of mixed oxides or creep cavities formed near the crack tip. A size scale effect is also predicted for the transformation toughening phenomenon, which is largest at or below K th but diminishes at increasing K levels above the threshold. Finally, the micromechanical models are utilized to identify means for suppressing time-dependent crack growth in Ni-base alloys.

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“…In this work, we utilize the triangular shape cohesive model to simulate the fracture process of adhesive bondline, which has three parameters. There are several methods to experimentally determine the cohesive parameters for cohesive zone model (Budiansky, 1988;Hutchinson, 1990;Cox, 1991;Bao, 1993). Since too many micro-mechanisms occur in the debonding procedure, it is more efficient to use phenomenological parameters.…”

Section: Role Of Contamination Levels a C G Jmentioning

confidence: 99%

Role of contamination on the bondline integrity of composite structures

Shang

2013

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Small-scale crack bridging and the fracture toughness of particulate-reinforced ceramics

Cited by 367 publications

References 6 publications

Precompaction Effects on Density and Mechanical Properties of Al<SUB>2</SUB>O<SUB>3</SUB> Nanopowder Compacts Fabricated by Magnetic Pulsed Compaction

Precompaction Effects on Density and Mechanical Properties of Al<SUB>2</SUB>O<SUB>3</SUB> Nanopowder Compacts Fabricated by Magnetic Pulsed Compaction

Time-Dependent Crack Growth Thresholds of Ni-Base Superalloys

Role of contamination on the bondline integrity of composite structures

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