کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1450022 | 988720 | 2008 | 11 صفحه PDF | دانلود رایگان |

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.
Journal: Acta Materialia - Volume 56, Issue 17, October 2008, Pages 4739–4749