The tube shown in Figure 9.8 is subjected to an internal pressure, \(p=5 \mathrm{MPa}\), instead of a torque. Neglecting the stress along the longitudinal axis of the tube, and assuming that the mode I fracture toughness is \(K_{\mathrm{Ic}}=10 \mathrm{MPa} \mathrm{m}^{1 / 2}\), determine the critical crack size.

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T 2a 38 mm. 42 mm diameter diameter FIGURE 9.8 Thin-walled tubular composite shaft with longitudinal crack.