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Comparison of shale fracture toughness obtained from scratch test and nanoindentation test
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2022-12-19 , DOI: 10.1016/j.ijrmms.2022.105282
Kouqi Liu, Zhijun Jin, Natalia Zakharova, Lianbo Zeng, Meysam Haghshenas, Adedoyin Adeyilola, Suman Saurabh

Fracture toughness is an important parameter in the hydraulic fracturing design, which is the major tool in the development of unconventional resources. Laboratory techniques for fracture toughness measurements usually require intact core samples and time-consuming sample preparation. The objective of this study is to compare fracture toughness values obtained by two less conventional methods: nanoindentation test and scratch test, which could facilitate the evaluation of this important parameter on smaller samples and at different scales. A set of 5 Antrim shale samples characterized by different mineral compositions is used to test this approach. For the scratch test, the fracture toughness and hardness are linearly correlated and show the same changing trend along the scratch length on all tested samples. For the nanoindentation test, the fracture toughness also increases with the increasing hardness. Most importantly, the results show that the fracture toughness values derived from these two methods are very similar, despite the difference in the scale of the measurements. This study is the first to compare fracture toughness between scratch and nanoindentation tests. Our results suggest that these two methods can be used to quickly evaluate fracture toughness from the shale core intervals containing both intact and nonintact parts.



中文翻译:

划痕试验与纳米压痕试验页岩断裂韧性比较

断裂韧性是水力压裂设计中的一个重要参数,是开发非常规资源的主要工具。用于断裂韧性测量的实验室技术通常需要完整的岩心样品和耗时的样品制备。本研究的目的是比较通过两种不太传统的方法获得的断裂韧性值:纳米压痕试验和划痕试验,这可以促进在较小样品和不同尺度上评估这一重要参数。一组 5 个以不同矿物成分为特征的 Antrim 页岩样品用于测试该方法。对于划痕测试,断裂韧性和硬度呈线性相关,并且在所有测试样品上沿划痕长度显示相同的变化趋势。对于纳米压痕测试,断裂韧性也随着硬度的增加而增加。最重要的是,结果表明,尽管测量范围不同,但这两种方法得出的断裂韧性值非常相似。这项研究首次比较了划痕和纳米压痕测试之间的断裂韧性。我们的结果表明,这两种方法可用于快速评估包含完整和非完整部分的页岩岩心层段的断裂韧性。

更新日期:2022-12-20
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