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The results show that anodizing and sealing reduces fatigue resistance appreciably. Specimens including a hole (Kt = 2.5) show, as expected, reduced fatigue life as compared to specimens without a hole loaded at the same stress amplitude. The exponents of the Weibull distribution, describing the plots in Fig. 9.23, are summarized in Table 9.41; the respective curves are plotted in Fig. 9.23 as well.

Reference Exfoliation Exfoliation

Corrosion Corrosion

FIGURE 9.20 Tensile behavior following exfoliation corrosion and mechanical removal of corrosion-induced surface damage for alloy 6013: (a) L direction and (b) LT direction.

Reference Exfoliation Exfoliation

Corrosion Corrosion

FIGURE 9.20 Tensile behavior following exfoliation corrosion and mechanical removal of corrosion-induced surface damage for alloy 6013: (a) L direction and (b) LT direction.

Fatigue Crack Growth Following Exfoliation Corrosion The above discussed corrosion-induced fatigue degradation was not reflected in the fatigue crack propagation tests performed for some material on both uncorroded and corroded anodized and sealed alloy specimens for four different R = amin/amax values. The results are displayed in Fig. 9.24 where the influence of the R value on

I Ultimate Stress

Yield Stress

Elongation to failure

Energy density

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