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By James K. Wessel

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Correspond to the median survival probability approximately. If a higher reliability level is required, the procedure for the determination of S(N ) has to be repeated by using values for X(N ), Y (N ), and off-axis test results to be fitted by Eq. 34), corresponding at that survival probability. As concluded from Figs. 31 the predictions of the FTPF criterion for off-axis orientations such as 60◦ or 75◦ are good and always on the safe side. The same is valid also for 45◦ , but the predictions are too conservative.

In the contrary, for off-axis loading, compressive stress ranges withstood by material coupons were almost double the respective tensile ones; see Fig. 23. 23 Effect of stress ratio R on 95% survival probability S–N curves. Off-axis, 45◦ , loading. To comply with the needs of designing a composite structure against variable amplitude fatigue, that is, spectrum loading, strength data are projected in the plane having as coordinates stress amplitude and mean stress, σa − σm . 37) and thus, every such curve of the family corresponds to a constant R value.

The material used was Eglass/polyester, E-glass from AHLSTROM GLASSFIBRE, while the polyester resin was CHEMPOL 80 THIX by INTERCHEM. 5% methyl ethyl ketone peroxide (MEKP, 50% solution), catalyst. Rectangular plates were fabricated by hand lay-up technique and cured at room temperature. Considering as 0◦ direction that of the UD layer fibers, the lay-up can be encoded as [0/(±45)2 /0]T . Coupons were cut, by a diamond saw wheel, at 0◦ , on-axis, and 15◦ , 30◦ , 45◦ , 60◦ , 75◦ , and 90◦ off-axis orientations.

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