高温下陶瓷抗弯强度增强模型

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials Pub Date : 2025-05-28 DOI:10.1016/j.mechmat.2025.105398

A.G. Sheinerman

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引用次数: 0

摘要

我们提出了一个模型来描述观察到的陶瓷抗弯强度的非单调温度依赖性。模型内的抗折强度受晶间边界滑动的影响，在一定温度下，这种滑动会钝化裂纹尖端，提高抗折强度。同时，在足够高的温度下，增强的边界滑动导致脆性破坏向延性破坏转变，从而降低了抗弯强度。结果表明，陶瓷在高温下的断裂强度受到晶间边界滑动特性和加载时间的强烈影响。断裂强度最高的陶瓷在短期加载时应具有较低的抗滑性，而在长期加载时应具有较高的抗滑性。模型计算结果与实验数据在定量上一致。

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Model of enhanced flexural strength of ceramics at elevated temperatures

We suggest a model that describes the observed non-monotonous temperature dependences of the flexural strength of ceramics. Within the model, the flexural strength is affected by the sliding of the intergranular boundaries, which can blunt the crack tip and increase the flexural strength at certain temperatures. At the same time, at high enough temperatures, enhanced boundary sliding results in the transition from the brittle to ductile failure, which reduces the flexural strength. It is demonstrated that the fracture strength of ceramics at elevated temperatures can be strongly affected by the sliding properties of the intergranular boundaries and the loading time. The ceramics with the highest fracture strength should have low sliding resistance at short-term loading and high sliding resistance in the case of long-term loading. The results of the model quantitatively agree with experimental data.

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来源期刊

Mechanics of Materials 工程技术-材料科学：综合

CiteScore

7.60

自引率

5.10%

发文量

243

审稿时长

46 days

期刊介绍： Mechanics of Materials is a forum for original scientific research on the flow, fracture, and general constitutive behavior of geophysical, geotechnical and technological materials, with balanced coverage of advanced technological and natural materials, with balanced coverage of theoretical, experimental, and field investigations. Of special concern are macroscopic predictions based on microscopic models, identification of microscopic structures from limited overall macroscopic data, experimental and field results that lead to fundamental understanding of the behavior of materials, and coordinated experimental and analytical investigations that culminate in theories with predictive quality.