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Indentation densification of fused silica assessed by raman spectroscopy and constitutive finite element analysis
Journal of the American Ceramic Society ( IF 3.9 ) Pub Date : 2020-01-26 , DOI: 10.1111/jace.17024
Sebastian Bruns 1 , Tobias Uesbeck 2 , Sindy Fuhrmann 3 , Mariona Tarragó Aymerich 2 , Lothar Wondraczek 3 , Dominique Ligny 2 , Karsten Durst 1
Affiliation  

Inelastic deformation of anomalous glasses manifests in shear flow and densification of the glass network; the deformation behavior during indentation testing is linked strongly to both processes. In this paper, the indentation densification field of fused silica is investigated using depth‐resolved Raman spectroscopy and finite element simulations. Through affecting the size of the indent, the normal load and the Raman laser spot size determine the spatial sampling resolution, leading to a certain degree of structural averaging. For appropriate combinations of normal load (indent size) and laser spot diameter, a maximum densification of 18.4% was found at the indent center. The indentation behavior was modeled by extended Drucker‐Prager‐Cap (DPC) plasticity, assuming a sigmoidal hardening behavior of fused silica with a densification saturation of 21%. This procedure significantly improved the reproduction of the experimental densification field, yielding a maximum densification of 18.2% directly below the indenter tip. The degree of densification was found to be strongly linked to the hydrostatic pressure limit below the indenter in accordance to Johnson's expanding cavity model (J. Mech. Phys. Solids, 18 (1970) 115). Based on the good overlap between FEA and Raman, an alternative way to extract the empirical correlation factor m, which scales structural densification to Raman spectroscopic observations, is obtained. This approach does not require the use of intensive hydrostatic compaction experiments.

中文翻译:

拉曼光谱和本构有限元分析评估熔融石英的压痕致密化

异常玻璃的非弹性变形表现为剪切流和玻璃网络的致密化。压痕测试期间的变形行为与这两个过程密切相关。本文利用深度分辨拉曼光谱和有限元模拟研究了熔融石英的压痕致密化场。通过影响压痕的大小,法向载荷和拉曼激光光斑大小决定了空间采样分辨率,从而导致一定程度的结构平均。对于正常载荷(凹痕尺寸)和激光光斑直径的适当组合,在凹痕中心发现最大致密化为18.4%。压痕行为是通过扩展的Drucker-Prager-Cap(DPC)可塑性建模的,假设熔融石英的S形硬化行为具有21%的致密化饱和度。该程序显着改善了实验致密化场的再现性,在压头尖端正下方产生了最大18.2%的最大致密化。根据约翰逊的膨胀腔模型(J.Mech.Phys.Solids,18(1970)115),发现致密化程度与压头以下的静水压力极限密切相关。基于FEA和拉曼之间的良好重叠,获得了提取经验相关因子m的另一种方法,该方法将结构致密化缩放到拉曼光谱观察。这种方法不需要使用密集的静水压实实验。该程序显着改善了实验致密化场的再现性,在压头尖端正下方产生了最大18.2%的最大致密化。根据约翰逊的膨胀腔模型(J.Mech.Phys.Solids,18(1970)115),发现致密化程度与压头以下的静水压力极限密切相关。基于FEA和拉曼之间的良好重叠,获得了提取经验相关因子m的另一种方法,该方法将结构致密化缩放到拉曼光谱观察。这种方法不需要使用密集的静水压实实验。该程序显着改善了实验致密化场的再现性,在压头尖端正下方产生了最大18.2%的最大致密化。根据约翰逊的膨胀腔模型(J.Mech.Phys.Solids,18(1970)115),发现致密化程度与压头以下的静水压力极限密切相关。基于FEA和拉曼之间的良好重叠,获得了提取经验相关因子m的另一种方法,该方法将结构致密化缩放到拉曼光谱观察。这种方法不需要使用密集的静水压实实验。根据约翰逊的膨胀腔模型(J.Mech.Phys.Solids,18(1970)115),发现致密化程度与压头以下的静水压力极限密切相关。基于FEA和拉曼之间的良好重叠,获得了提取经验相关因子m的另一种方法,该方法将结构致密化缩放到拉曼光谱观察。这种方法不需要使用密集的静水压实实验。根据约翰逊的膨胀腔模型(J.Mech.Phys.Solids,18(1970)115),发现致密化程度与压头以下的静水压力极限密切相关。基于FEA和拉曼之间的良好重叠,获得了提取经验相关因子m的另一种方法,该方法将结构致密化缩放到拉曼光谱观察。这种方法不需要使用密集的静水压实实验。
更新日期:2020-01-27
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