Method of Studying Subcritical Cracking of Opaque Materials
Method of Studying Subcritical Cracking of Opaque Materials
复制标题
DOI：
10.1111/j.1151-2916.1973.tb12345.x
复制
发表时间：
1973
影响因子：
3.9
通讯作者：
K. McKinney;H. L. Smith
中科院分区：
文献类型：
--
作者：
K. McKinney;H. L. Smith
由于亚临界开裂往往先于灾难性的故障，这是一个重要的工程考虑，特别是如果一个结构是在应力下很长一段时间。已经开发了用于亚临界裂纹实验室研究的试样，但假定可以通过试样直观地观察到裂纹扩展。对于不透明材料，这样的观察通常是不切实际或不可能的。提出了一种获得裂纹扩展数据的柔度方法。使用聚甲基丙烯酸甲酯，钠钙玻璃，和不透明的玻璃陶瓷的实验例表明，该方法工作得很好。该方法的实用性示出了3个商业陶瓷。结果表明，亚临界开裂发生在这些材料的断裂能的范围内。
Since subcritical cracking often precedes catastrophic failure, it is an important engineering consideration, especially if a structure is to be under stress for a long time. A specimen has been developed for laboratory study of subcritical cracking, but it is assumed that crack growth can be observed visually through the specimen. With opaque materials, such observation is generally impractical or impossible. A compliance method of obtaining crack-growth data is proposed. Experimental examples using polymethyl methacrylate, soda-lime glass, and an opaque glass-ceramic show that the method works very well. The usefulness of the method is illustrated for 3 commercial ceramics. It is shown that subcritical cracking occurs over a range of fracture energies for each of these materials.