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Fig. 3 | Geothermal Energy

Fig. 3

From: The influence of thermal treatment on rock–bit interaction: a study of a combined thermo–mechanical drilling (CTMD) concept

Fig. 3

Tool penetration and wear flat in sandstone. Tool penetration during testing of Rorschach sandstone is shown, with the scattered data and the left y-axis for untreated (violet squares) and after treatment (green circles). The symbol sizes represent the wear flattening of the cutting tool (see legend in the figure). The bi-linear regressions of the tool penetration values along the scratch distance are shown as dashed black lines. As a bar plot, we also include the wear flat increase per unit of scratch distance, here called wear slope, where the values are provided by the right y-axis. The bars indicate the wear slope for untreated (violet) and after-treatment (green) conditions, shown as contiguous columns for the scratch distance ranges 0–4 mm, 4–8 mm, 8–15 mm and 15–90 mm

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