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Comment on “Measurement of the elastic properties of swelling clay minerals using the digital image correlation method on a single macroscopic crystal”, by S. Hedan, F. Hubert, D. Prêt, E. Ferrage, V. Valle, P. Cosenza [Applied Clay Science 116–117 (2015), 248–256, doi: 10.1016/j.clay.2015.04.002]
Applied Clay Science ( IF 5.3 ) Pub Date : 2016-10-12 , DOI: 10.1016/j.clay.2016.10.005
Shengmin Luo , Dongwei Hou , Guoping Zhang

Hedan et al. (2015) recently reported an interesting method for determining the elastic modulus of vermiculite, a representative swelling clay mineral. A platy natural macrocrystal of vermiculite was used in the study. The technique combining mechanical compression and digital image correlation (DIC) appears plausible. However, a fundamental issue related to the reported testing method, particularly the experimental setup and specimen geometry constraints, arises and is worth re-examination and discussion, because it may make the reported modulus inappropriate or inaccurate. In this short discussion, the stress distribution of a thin plate such as the tested vermiculite macrocrystal under uniaxial compression is analyzed, and the reported results are re-interpreted. It appears that the reported Young's modulus of 32.3 GPa is too high for the studied vermiculite.



中文翻译:

S. Hedan,F。Hubert,D。Prêt,E。Ferrage,V。Valle,P。Cosenza [关于在单个宏观晶体上使用数字图像相关方法测量膨胀黏土矿物的弹性性能的评论] [ Applied Clay Science 116–117(2015),248–256,doi:10.1016 / j.clay.2015.04.002]

Hedan等。(2015年)最近报道了一种有趣的方法来确定ver石(一种代表性的膨胀黏土矿物)的弹性模量。该研究中使用了片状天然crystal石大晶。结合机械压缩和数字图像相关性(DIC)的技术似乎是合理的。但是,出现了与报告的测试方法有关的基本问题,尤其是实验设置和样品几何形状的限制,值得重新研究和讨论,因为这可能使报告的模量不合适或不准确。在简短的讨论中,分析了薄板(例如,经测试的ver石大晶体)在单轴压缩下的应力分布,并对报告的结果进行了重新解释。似乎报告的杨氏模量为32。

更新日期:2016-10-12
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