Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
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(a) (b)<br />
3.21: (a) Energy release rate vs. load <strong>and</strong> (b) mode-mixity vs. load for panels with PMI core<br />
<strong>and</strong> 100 mm debond with different initial imperfection magnitudes.<br />
As mentioned previously, compiling a plot <strong>of</strong> strength reduction factor Rl against debond<br />
diameter presents some difficulty. However, Figure 3.22 shows a strength reduction factor based<br />
on the intact strength corresponding to compressive material failure as shown in Table 3.4, which<br />
is in turn based on the laminate compressive strengths presented in Table 3.1. The reduced<br />
strength values are based on the measured debond propagation loads, with the values for 50 mm<br />
debonds interpolated with the aid <strong>of</strong> the FE simulations. This figure is tentative in view <strong>of</strong> the<br />
uncertainties regarding the intact strengths <strong>and</strong> also the differences between test <strong>and</strong> analysis<br />
results reported above.<br />
3.22: Local strength reduction factors for panels with debonds.<br />
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