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. 2025 Jul 1;15:22359. doi: 10.1038/s41598-025-04492-5

Table 3.

Regression Coefficients of Eq. (2).

Normal Stress /MPa Slope Angle /° Inline graphic A b c R
1.962 10 0.1714 0.0321 0.1981 0.880 0.9958
1.962 30 0.3514 0.0540 0.2075 0.860 0.9230
1.962 45 0.3616 0.1784 0.4085 0.780 0.9982