A statistical investigation of the effects of grain boundary properties on transgranular fracture

R. H. Kraft; J. F. Molinari

doi:10.1016/j.actamat.2008.05.036

A statistical investigation of the effects of grain boundary properties on transgranular fracture

R. H. Kraft, J. F. Molinari

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Abstract

A two-dimensional finite-element model is developed to investigate transgranular fracture in polycrystalline alumina under tensile loading. Microcracking is modeled explicitly using the cohesive interface approach. The effects of grain boundary distributions on mesoscopic failure strength and fracture energy, and the resulting percentages of transgranular fracture are examined. Results are based on 20 different realizations of microstructures in an attempt to capture the stochastic nature of brittle failure. Numerical results indicate that the grain boundary distribution has profound effects on mesoscopically observed values, which are in part controlled by the crack propagation path. Based on observations of the simulated crack path, microstructural engineering with respect to grain morphology is conducted, leading to a significant increase in performance.

Original language	English (US)
Pages (from-to)	4739-4749
Number of pages	11
Journal	Acta Materialia
Volume	56
Issue number	17
DOIs	https://doi.org/10.1016/j.actamat.2008.05.036
State	Published - Oct 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2008.05.036

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title = "A statistical investigation of the effects of grain boundary properties on transgranular fracture",

abstract = "A two-dimensional finite-element model is developed to investigate transgranular fracture in polycrystalline alumina under tensile loading. Microcracking is modeled explicitly using the cohesive interface approach. The effects of grain boundary distributions on mesoscopic failure strength and fracture energy, and the resulting percentages of transgranular fracture are examined. Results are based on 20 different realizations of microstructures in an attempt to capture the stochastic nature of brittle failure. Numerical results indicate that the grain boundary distribution has profound effects on mesoscopically observed values, which are in part controlled by the crack propagation path. Based on observations of the simulated crack path, microstructural engineering with respect to grain morphology is conducted, leading to a significant increase in performance.",

author = "Kraft, {R. H.} and Molinari, {J. F.}",

note = "Funding Information: The support of the Army Research Office under the Grant No. W911NF-05-1-0370 is gratefully acknowledged as well as the support of the Army Research Laboratory through a subcontract from the University of Nebraska-Lincoln under the Grant No. 25-1105-0005-200. R.H.K. is grateful to Derek Warner for fruitful discussions leading to this work. ",

year = "2008",

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language = "English (US)",

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journal = "Acta Materialia",

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AU - Kraft, R. H.

AU - Molinari, J. F.

N1 - Funding Information: The support of the Army Research Office under the Grant No. W911NF-05-1-0370 is gratefully acknowledged as well as the support of the Army Research Laboratory through a subcontract from the University of Nebraska-Lincoln under the Grant No. 25-1105-0005-200. R.H.K. is grateful to Derek Warner for fruitful discussions leading to this work.

PY - 2008/10

Y1 - 2008/10

N2 - A two-dimensional finite-element model is developed to investigate transgranular fracture in polycrystalline alumina under tensile loading. Microcracking is modeled explicitly using the cohesive interface approach. The effects of grain boundary distributions on mesoscopic failure strength and fracture energy, and the resulting percentages of transgranular fracture are examined. Results are based on 20 different realizations of microstructures in an attempt to capture the stochastic nature of brittle failure. Numerical results indicate that the grain boundary distribution has profound effects on mesoscopically observed values, which are in part controlled by the crack propagation path. Based on observations of the simulated crack path, microstructural engineering with respect to grain morphology is conducted, leading to a significant increase in performance.

AB - A two-dimensional finite-element model is developed to investigate transgranular fracture in polycrystalline alumina under tensile loading. Microcracking is modeled explicitly using the cohesive interface approach. The effects of grain boundary distributions on mesoscopic failure strength and fracture energy, and the resulting percentages of transgranular fracture are examined. Results are based on 20 different realizations of microstructures in an attempt to capture the stochastic nature of brittle failure. Numerical results indicate that the grain boundary distribution has profound effects on mesoscopically observed values, which are in part controlled by the crack propagation path. Based on observations of the simulated crack path, microstructural engineering with respect to grain morphology is conducted, leading to a significant increase in performance.

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JO - Acta Materialia

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A statistical investigation of the effects of grain boundary properties on transgranular fracture

Abstract

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