A Novel Methodology for Calculating Crack Opening Stress under Tension-Compression Cyclic Load

Figure 6

Correlation between polynomial coefficients and maximum applied stress. Both polynomial coefficients b₁ and b₂ are exponential to the maximum applied stress, as shown by the square and circular points. The polynomial intercept is also exponential to the maximum applied stress, as shown by the triangle points. However, contrary to the increasing trend of b₁ and b₂, showed a decreasing trend with the increase of maximum applied stress.