Time and humidity dependence of indentation cracking in aluminosilicate glasses
Time and humidity dependence of indentation cracking in aluminosilicate glasses
复制标题
铝硅酸盐玻璃压痕裂纹的时间和湿度依赖性
DOI：
10.1016/j.jnoncrysol.2018.04.009
复制
发表时间：
2018
影响因子：
3.5
通讯作者：
M. Smedskjaer
中科院分区：
文献类型：
--
作者：
T. K. Bechgaard;J. Mauro;M. Smedskjaer
氧化玻璃固有的脆性和较差的抗裂性一直是其许多先进应用的主要限制之一。由于裂纹的形成会导致施加拉伸应力的放大，最终导致灾难性的破坏，因此了解裂纹起裂和扩展的成分和结构依赖关系是一个很有兴趣的问题。抗裂性通常可以使用仪器压痕来测量，该压痕模仿某些应用中的实际损坏。Wada介绍了一种通过计算初始裂纹数量作为施加载荷的函数来评估抗裂性的方法。实验表明，环境湿度和压痕与裂纹计数之间的时间间隔都会影响抗裂值，但遗憾的是，这些参数在文献研究中并不总是报道。本文系统研究了钙铝硅酸盐玻璃裂纹萌生的时间和湿度依赖性。根据实验条件（时间和湿度）的不同，铝硅酸盐玻璃的抗裂性可以变化两倍以上。此外，观察到的径向/中间裂纹可能在压痕发生数小时后产生。因此，这些结果表明需要一个标准化的程序来确定抗裂性，以便比较来自不同研究小组的数据。我们建议在压痕和裂纹计数之间包括一个足够长的等待期（如24 h），因为大多数裂纹萌生将在那时发生。
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.
影响因子：
3.5
作者：
R. Limbach;A. Winterstein-Beckmann;J. Dellith;D. Möncke;L. Wondraczek
通讯作者：
R. Limbach;A. Winterstein-Beckmann;J. Dellith;D. Möncke;L. Wondraczek
(Na,Zn)-硫磷酸盐玻璃的微观机械性能
影响因子：
3.5
作者：
S. Striepe;J. Deubener;L. Wondraczek
通讯作者：
L. Wondraczek