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Figure 8


Fig. 8. Empirical (A) and calculated (B) fatigue crack growth rates (m cycle-1), da/dN, plotted against energy release rate (J m–2), TS, in single-edge-notch, repeatedly loaded test pieces. Axes in plots are logarithmic. Data for test specimens that did not demonstrate crack growth are not shown. In both A and B, diamonds represent M. flaccida, squares, M. splendens, triangles, U. expansa, and crosses, P. occidentalis. Symbols used in A are given in the plot. For B, the black line with no symbols represents the power-law series for all data collected for all species. Again in B, solid symbols (diamonds, squares, triangles, and crosses) represent power-law series calculated from all data for each species. Open diamonds (M. flaccida) and squares (M. splendens) are for relations determined from the upper bounds of crack growth rates for the two species. Open triangles are for a relation for U. expansa that excludes the lowest crack growth rate point for U. expansa in A.





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