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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 >Time and humidity dependence of indentation cracking in aluminosilicate glasses
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Time and humidity dependence of indentation cracking in aluminosilicate glasses

机译：粘附在硅铝酸盐玻璃中裂缝的时间和湿度依赖性

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摘要

The inherent brittleness and poor crack resistance of oxide glasses have always been among their main limitations for many advanced applications. As the formation of cracks leads to amplification of applied tensile stresses and ultimately catastrophic failure, there is an interest in understanding the compositional and structural dependence of crack initiation and growth. The resistance to cracking can conventionally be measured using instrumented indentation that mimics the real-life damage for certain applications. Wada introduced a method to evaluate the crack resistance by counting the number of initiated cracks as a function of the applied load. Experiments have shown that the environmental humidity and the time period between indentation and crack counting both affect the crack resistance value, but unfortunately these parameters are not always reported in literature studies. Here we perform a systematic study of the time and humidity dependence of crack initiation in calcium aluminosilicate glasses. Depending on the experimental conditions (time and humidity), the crack resistance of an aluminosilicate glass can vary by more than a factor of two. Furthermore, the observed radial/median cracks can initiate several hours after indentation. These results therefore indicate the need for a standardized procedure for determination of crack resistance to allow comparison of data from different research groups. We suggest including a sufficiently long waiting period (such as 24 h) between indentation and crack counting, as the majority of the crack initiation will then have occurred.
机译：氧化物玻璃的固有的脆性和差的抗裂性一直是其主要的局限性之间的许多高级应用。由于裂缝的形成导致施加的拉伸应力扩增并最终灾难性失效，因此有兴趣了解裂纹引发和生长的组成和结构依赖性。通常可以使用仪表压痕来测量对裂缝的抵抗力，以模仿某些应用的真实损伤。 WAAS介绍了一种通过计数引发的裂缝的数量来评估裂缝电阻的方法。实验表明，环境湿度和压痕和裂纹之间的时间段计数影响抗裂性值，但遗憾的是这些参数并不总是在文献研究中报道。在这里，我们对铝硅酸钙玻璃裂纹引发的时间和湿度依赖性进行了系统研究。取决于实验条件（时间和湿度），硅铝酸盐玻璃的抗裂性可以变化超过两倍。此外，观察到的径向/中值裂缝可以在压痕后几个小时开始。因此，这些结果表明需要标准化程序来确定抗裂性，以允许与不同研究组的数据进行比较。我们建议在压痕和裂缝计数之间包括足够长的等待期（例如24小时），因为然后发生大部分裂缝开​​始。

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