Cyclic Fatigue of Ceramics

Ritchie, Robert O.; Dauskardt, Reinhold H.

doi:10.2109/jcersj.99.1047

Cited by 123 publications

(20 citation statements)

References 6 publications

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“…The reasons for and the effects of such a high Paris slope are often misunderstood. Indeed, though the Paris slope is often equated to that of engineering ceramics [14], the toughness of lamellar γ -TiAl alloys can reach 30 MPa m 1/2 -part-way between the few MPa m 1/2 of Figure 1. Schematic of FCG curves.…”

Section: Damage-tolerant Designmentioning

confidence: 99%

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

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The high-cycle fatigue (HCF) properties of γ -TiAl (gamma titanium aluminide) alloys are reviewed, particularly with regards to the deformation mechanisms active in the near-threshold cyclic loading regime. By examining the influence of lamellar orientation and thickness on the HCF threshold, in addition to more conventional microstructural considerations such as the grain size or the volume fraction of lamellar colonies, factors to improve the γ -TiAl microstructure for HCF are assessed. Finally, experimental methods and loading strategies are surveyed to identify techniques for improving HCF testing of γ -TiAl alloys. In this, we consider both the conservativism of differing approaches and the possibility to measure with suitable resolution the local mechanical behaviour under HCF of the lamellar γ -TiAl microstructure. ARTICLE HISTORY

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Section: Damage-tolerant Designmentioning

confidence: 99%

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

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“…At the micro-scale, the fatigue of ductile materials is attributed to cyclic plasticity involving dislocation motion that causes alternating blunting and resharpening of a pre-existing crack tip as it advances [11]. In contrast, brittle materials invariably lack dislocation mobility at ambient temperatures, such that fatigue occurs by cycle-dependent degradation of the (extrinsic) toughness of the material in the wake of the crack tip [12].…”

Section: Introductionmentioning

confidence: 99%

A reaction-layer mechanism for the delayed failure of micron-scale polycrystalline silicon structural films subjected to high-cycle fatigue loading

2002

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Abstract-A study has been made of high-cycle fatigue in 2-µm thick structural films of n + -type, polycrystalline silicon for MEMS applications. Using an "on-chip" test structure resonating at ~40 kHz, such thin-film polysilicon is shown to display "metal-like" stress-life fatigue behavior in room air environments, with failures occurring after lives in excess of 10 11 cycles at stresses as low as half the fracture strength. Through in-situ monitoring of the natural frequency to evaluate the damage evolution by notch-root oxidation and cracking, and using transmission electron microscopy to image such damage, it is concluded that the mechanism of thin-film silicon fatigue involves sequential oxidation and environmentallyassisted cracking in the native SiO 2 layer. This moisture-induced "reaction-layer fatigue" mechanism can also occur in bulk silicon but it is only significant in thin films where the critical crack size for catastrophic failure can be reached by a crack growing within the oxide layer. The susceptibility of thin-film silicon to fatigue failure is shown to be suppressed by the use of alkene-based self-assembled monolayer coatings that prevent the formation of the native oxide.

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“…In the fracture mechanics of ceramic materials, the relationship between the relative crack length and physical quantities (e.g., compliance, or the correction coefficient of the stress intensity factor) is generally expressed by polynomial approximation curve. [25][26][27] In this work, regression analysis was performed with the 4th order polynomial shown in Eq. (10).…”

Section: Evaluation Of Crack Growth Behaviourmentioning

confidence: 99%

Fracture Mechanics Investigation of MgO–C Bricks for Steelmaking by Bending and Fatigue Failure Tests Along with X-Ray CT Scan Observation

Hino¹,

Yoshida²,

Kiyota³

et al. 2013

ISIJ Int.

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Fatigue failure tests were firstly carried out. The material constant derived from S-N curve was evaluated and compared with previous study. The compliance method was subsequently used to evaluate the fracture toughness of MgO-C brick and the relationship between the stress factor and crack growth rate. In order to use this method, the effects of brick carbon content on the crack growth rate and crack growth rate in high temperature were investigated.As a result, it was found that the crack growth rate increased when the carbon content in brick decreased. This result was confirmed by X-ray CT scans, which revealed large cracks in bricks with a lower carbon content, even in the middle of fatigue failure tests.Furthermore, the material constants obtained from fatigue failure test and K-V diagram were compared. A material constant was derived by evaluating the relationship between the crack growth rate and stress intensity factor, and the result was found to agree with the value derived from fatigue failure tests. This result confirms that that material constant derived from fatigue failure tests is the inherent property of the material and corresponds to the variation of crack growth rate with changes in stress factor. The effects of carbon content in MgO-C brick on the crack growth behaviour and fatigue failure mechanism were also investigated.

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Cyclic Fatigue of Ceramics

Cited by 123 publications

References 6 publications

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

A reaction-layer mechanism for the delayed failure of micron-scale polycrystalline silicon structural films subjected to high-cycle fatigue loading

Fracture Mechanics Investigation of MgO–C Bricks for Steelmaking by Bending and Fatigue Failure Tests Along with X-Ray CT Scan Observation

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