Abstract
Shales are the primary resource to produce unconventional oil and gas using hydraulic fracturing. Thus, understanding and evaluating the evolution of damage in shale materials under dynamic loading conditions will support the development and improve current extraction techniques. An experimental–analytical approach was developed in this work to observe microcrack growth under dynamic stress loading conditions. The developed method was used to measure the local damage across the in-plane of a circular disk (Brazilian disk) subjected to a compressive stress waves. Experimentally, circular disk specimens are prepared from Anadarko basin, Oklahoma, USA and tested with different bedding stacking orientations. The Split Hopkinson pressure bar (SHPB) was used to generate a compressive stress wave. The localized strain and damage initiation as a function of time are monitored using digital image correlation. The experimental data was used as input to the macro-damage (time-depend macro-damage) model. The experimental setup, specimen preparation was presented, as well as a critical local damage-initiation related to the orientation of the layers and cracking density were discussed.
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This material is based upon work supported by the Department of Energy under Award Number DE-FE0031777. This report was prepared as an account of work sponsored by an agency of the US Government. Neither the US Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the US Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the US Government or any agency thereof.
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Fahem, A.F., Singh, R.P. (2022). Dynamic Damage Evolution in Shale in the Presence of Pre-Existing Microcracks. In: Mates, S., Eliasson, V. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-86562-7_7
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