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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Modeling the effect of composition and thermal quenching on the fracture behavior of borosilicate glass
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Modeling the effect of composition and thermal quenching on the fracture behavior of borosilicate glass

机译：模拟组成和热淬火对硼硅玻璃断裂行为的影响

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摘要

This article describes the fracture processes simulated by classical molecular dynamics in three alkali borosilicate glasses of different compositions. Applying an external tensile load results in glass fracturing through processes of nucleation, growth, and coalescence of cavities. The cavity nucleation processes begin during the elastic phase and differ depending on the glass composition and especially on the [Na _2O]/[B _2O _3] ratio. The cavity growth and coalescence phases are associated with the plastic phase. The concentration of BO _3 entities has a strong influence on the cavity growth rate because these entities limit the accumulation of local stresses. Glass specimens with the same compositions but disordered by the application of a higher quenching rate were also fractured. These glasses are considered as models of irradiated structures and analyzing their fracture behaviors gives interesting information as to the understanding on why the fracture toughness evolves under irradiation.
机译：本文介绍了由经典分子动力学模拟的三种不同成分的碱金属硼硅酸盐玻璃的断裂过程。施加外部拉伸载荷会导致玻璃通过空腔的成核，生长和聚结过程破裂。空穴成核过程在弹性阶段开始，并且取决于玻璃组成，尤其是[Na _2O] / [B _2O _3]的比例而不同。空穴的生长和聚结阶段与塑性阶段有关。 BO _3实体的浓度对空腔的生长速度有很大的影响，因为这些实体限制了局部应力的积累。具有相同组成但由于施加更高淬火速率而无序的玻璃样品也被断裂。这些玻璃被认为是受辐照结构的模型，对其断裂行为的分析提供了有趣的信息，有助于理解为何在辐照下会产生断裂韧性。

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