Consider the case of the pressurized circular hole in an anisotropic sheet. Using orthotropic material properties given in Table 11.2 for Carbon/Epoxy, compute and plot the boundary hoop stress σ_θ as a function of θ. Compare with the isotropic case. 

Table 11.2

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Table 11.2 Typical Elastic Moduli for Some Planar Orthotopic Composite Materials Material E (GPa) E (GPa) 50 205 205 76 S-Glass/Epoxy Boron/Epoxy Carbon/Epoxy Kevlar49/Epoxy Note: Direction I corresponds to fiber layout axis. 17 20 10 5.5 "12 0.27 0.23 0.26 0.34 #12 (GPa) 7 6.5 6 2.2