Indentation plasticity and the ensuing fracture of glass
Indentation plasticity and the ensuing fracture of glass
复制标题
玻璃的压痕塑性和随之而来的断裂
DOI：
10.1088/0022-3727/9/15/011
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
J. Hagan
中科院分区：
文献类型：
--
作者：
M. Swain;J. Hagan
对各种玻璃上球形压痕的系统研究表明，对于小压头（<或约=1 mm），发生塑性流动以及赫兹圆锥破裂。然而，更令人感兴趣的是，在卸载时，在接触区域周围形成一系列径向裂纹。随着继续卸载，这些裂纹增长，并在完全卸载之前，一个完全独立的横向裂纹系统，这是负责材料去除过程，发生。使用倒置显微镜跟踪压痕过程，并产生压痕应力-应变曲线。这些曲线与最近的压痕相关表达式进行了比较，发现拟合得相当好。接触部位的径向裂纹分析的应力场，这是一个复合的正常赫兹加载情况下，再加上一个空腔附近的自由表面的扩张。该模型与实验结果相当吻合，并提供了一个定性的处理横向开裂现象。
A systematic study of spherical indentations on various glasses has shown that for small indenters (<or approximately=1 mm) plastic flow as well as Hertzian cone cracking occurs. What is of more interest however, is that on unloading, a series of radial cracks forms about the area of contact. With continued unloading, these cracks grow and just before complete unloading, an entirely independent system of lateral cracks, which are responsible for material removal processes, occurs. The indentation process was followed using an inverted microscope and indentation stress-strain curves were produced. These curves were compared with recent indentation correlation expressions and found to fit reasonably well. The radial cracking about the contact site was analysed in terms of a stress field which was a composite of the normal Hertzian loading situation coupled with the expansion of a cavity adjacent to a free surface. This model agrees reasonably well with experiment and provides a qualitative treatment of lateral cracking phenomena.