In situ characterisation of dynamic fracture in \(Al_2O_3\) using ultra-fast X-ray phase contrast radioscopy: effects of porosity and crack speed

IF 2.2 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Fracture Pub Date : 2025-01-13 DOI:10.1007/s10704-024-00816-0

Q. Henry, J.-B. Kopp, L. Le Barbenchon, J. Girardot, B. Lukić, A. Cohen, A. Cosculluela, P. Viot

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Abstract

The dynamic fracture properties of porous ceramics were studied using single bunch synchrotron X-ray phase contrast imaging. The modified brazilian geometry was used to initiate and propagate a pure mode I crack. The specimen was compressed using the Split Hopkinson bars at strain rates of the order of \(10^2\) s\(^{-1}\). Main cracks were isolated for four different grades of \(Al_2O_3\), one dense alumina, and three porous grades with \(20~\%\) to \(60~\%\) porosity. The maximum measured crack velocities for three grades is of the order of \(0.6c_R\) and \(0.4c_R\) for the most porous. The fracture energy was estimated using a FE numerical simulation to quantify the influence of inertial effects induced by crack propagation. The results show that these inertial effects are far from negligible (up to \(80~\%\) of the stored energy) and that the dynamic correction factors known from the literature tend to overestimate the fracture energy. The values obtained vary from 22 J/m\(^2\) for the densest to 5 J/m\(^2\) for the most porous.

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使用超快速x射线相衬放射镜对\(Al_2O_3\)动态裂缝的原位表征：孔隙率和裂纹速度的影响

采用单束同步x射线相衬成像技术研究了多孔陶瓷的动态断裂特性。采用修正巴西几何模型对纯I型裂纹进行了初始化和扩展。试样使用劈裂霍普金森杆压缩，应变速率为\(10^2\) s \(^{-1}\)数量级。对4种不同等级的\(Al_2O_3\)、1种致密氧化铝和3种孔隙度为\(20~\%\) ～ \(60~\%\)的多孔氧化铝进行了主裂缝隔离。三个等级的最大测量裂纹速度为\(0.6c_R\)和\(0.4c_R\)数量级。利用有限元数值模拟估算了裂纹扩展引起的惯性效应对断裂能的影响。结果表明，这些惯性效应远非可以忽略不计（高达储存能量的\(80~\%\)），并且从文献中已知的动态修正因子往往高估了断裂能。得到的数值从密度最大的22 J/m \(^2\)到最多孔的5 J/m \(^2\)不等。

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来源期刊

International Journal of Fracture 物理-材料科学：综合

CiteScore

4.80

自引率

8.00%

发文量

审稿时长

13.5 months

期刊介绍： The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications. The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged. In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.