کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1561718 1513945 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and fracture property relation for silicon nitride on the microscale
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Structure and fracture property relation for silicon nitride on the microscale
چکیده انگلیسی

The fracture toughness of silicon nitride ceramics is closely related to its microstructure, which is characterized by a bimodal distribution of partially large and elongated grains. In the first stage of fracture, these grains act as elastic bridges, which avoid a quick crack propagation. In order to improve the understanding of this R-curve effect, a unit cell approach for multiscale finite element simulation has been chosen. For the examination of the morphology influence on fracture stress and toughness unit cells with different mean aspect ratios have been utilized for the fracture simulations.As results, on the one hand effective stress–strain curves have been applied for the computation of the effective R-curves. On the other hand, these results have been compared with observations of the stress and strain fields on the local level. Findings on the local level support the concept of elastic bridging grains.


► Silicon nitride modeled by a highly detailed unit cell approach.
► Fracture of phases modeled by simple experiment-based assumptions.
► Effective fracture behavior determined by fundamental fracture mechanics.
► First simulation of evolution and fracture of elastic bridging grains.
► Structure–property relation observed and explained by micromechanic observations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 64, November 2012, Pages 234–238
نویسندگان
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