Using the notation of carpet plots this laminate has alpha

Question

Consider a [010/9010]S with ply thickness tk = 0.125 mm. The material is Eglass-polyester (Table:1:1) with fiber's Weibull shape parameter m = 6.2.

Using the notation of carpet plots, this laminate has α = 0.5, β = 0.5, γ = 0. Using the methodology presented in this chapter, compute:

1. the laminate FPF strength F_xt. Which lamina cracks first, thus defining FPF?

2. the laminate FPF strength F_yt. Which lamina cracks first, thus defining FPF?

3. recompute using in-situ strengths with transition thickness tt = 1.2 mm.

4. Explain why F_yt = F_xt.