玻璃中压痕致密化的幅度和范围的无损三维定量
Nondestructive 3D Quantification of the Magnitude and Extent of Indentation-Induced Densification in Glass
- Korea Advanced Institute of Science and Technology (KAIST)（韩国科学技术院）
- KAIST Institute for Imaging（KAIST成像研究所）
- Tomocube Inc.（Tomocube公司）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用低相干全息断层扫描定量三维折射率变化，结合洛伦兹-洛伦茨关系分析致密化，揭示载荷、保压时间对致密化体积的影响，并联合裂纹形态表征亚表面损伤。
AI中文摘要：
维氏硬度表征抗压痕能力，但无法区分局部致密化的幅度与受影响玻璃的体积。本文采用低相干全息断层扫描技术，在不同施加载荷和标称保压时间下，重建了维氏压痕熔融石英、硼硅酸盐玻璃和钠钙玻璃的三维折射率图像。利用洛伦兹-洛伦茨关系分析折射率变化以定量致密化，同时通过分割测量致密化区域的空间范围。在相同的重建折射率图像中观察到裂纹。当峰值致密化趋于平稳时，致密化体积随载荷增加而增大，且硬度相似的玻璃表现出不同的致密化响应。较长的标称保压时间与高于固定折射率阈值的更大体积相关，而峰值致密化的变化相对较小。因此，致密化与裂纹形态的联合分析可表征硬度之外的亚表面压痕损伤。致密化是在洛伦兹-洛伦茨假设下作为光学估计进行定量的；残余应力、极化率和重建也可能影响折射率。
英文摘要：
Vickers hardness characterizes resistance to indentation but does not distinguish the magnitude of local densification from the volume of glass affected. Here, low-coherence holotomography reconstructs three-dimensional refractive-index (RI) images of Vickers-indented fused silica, borosilicate, and soda-lime glass across applied loads and nominal dwell times. Analysis of RI changes using the Lorentz-Lorenz relation quantifies densification, while segmentation measures the spatial extent of the densified region. Cracks are observed within the same reconstructed RI images. Densified volume increased with load even when peak densification plateaued, and glasses with similar hardness showed different densification responses. Longer nominal dwell times were associated with larger volumes above fixed RI thresholds and comparatively small changes in peak densification. Joint analysis of densification and crack morphology thus characterizes subsurface indentation damage beyond hardness alone. Densification is quantified as an optical estimate under the Lorentz-Lorenz assumptions; residual stress, polarizability, and reconstruction can also affect RI.
