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<p>This contribution deals with the determination of the velocities of rock fragments from the uniaxial compression test. For this purpose, two granite and one sandstone specimens were subjected to force-controlled loading until failure, and this process was recorded using a&#xa0;high-speed camera. Different frame rates and image resolutions were used to examine the influence of the recording parameters. The evaluation was carried out using the camera’s associated software, whereby the suitability of both manual and automatic evaluation was tested. For this purpose, the fragments were divided into different size classes which exist before and after the specimens burst. Finally, the individual velocities, as well as the mean value and standard deviations of the velocities, were used to compare the results. Using the results of the manual evaluation as a&#xa0;reference, various adaptations were made to achieve the same accuracy using the automatic tool. Taking all optimizations into account, a&#xa0;deviation of the mean particle velocity of all size classes in the automatic evaluation of around 20% could be achieved.</p>

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Bestimmung der Geschwindigkeiten von Bruchfragmenten aus dem einaxialen Druckversuch mittels einer Highspeed-Kamera

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月17日

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  • Simon Reitbauer,
  • Jürgen Pfoser

摘要

This contribution deals with the determination of the velocities of rock fragments from the uniaxial compression test. For this purpose, two granite and one sandstone specimens were subjected to force-controlled loading until failure, and this process was recorded using a high-speed camera. Different frame rates and image resolutions were used to examine the influence of the recording parameters. The evaluation was carried out using the camera’s associated software, whereby the suitability of both manual and automatic evaluation was tested. For this purpose, the fragments were divided into different size classes which exist before and after the specimens burst. Finally, the individual velocities, as well as the mean value and standard deviations of the velocities, were used to compare the results. Using the results of the manual evaluation as a reference, various adaptations were made to achieve the same accuracy using the automatic tool. Taking all optimizations into account, a deviation of the mean particle velocity of all size classes in the automatic evaluation of around 20% could be achieved.