A laminated plate consisting of the [90/0/90] \(]_{\mathrm{s}} \mathrm{AS} / 3501\) laminate described in Example 7.13 has a central hole, as shown in Figure 9.28. The plate is loaded uniaxially along the \(0^{\circ}\) direction as shown. Using the Whitney-Nuismer average stress criterion for stress fracture with an unnotched laminate tensile strength of \(\sigma_{0}=500 \mathrm{MPa}\), and an averaging distance \(a_{0}=10 \mathrm{~mm}\), plot the notched tensile strength \(\sigma_{\mathrm{N}}^{\infty}\) as a function of hole radius \(R\). What are the maximum and minimum theoretical values of the notched tensile strength, and under what conditions do they occur?

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EXAMPLE 7.13 A [90/0/90], laminate consisting of the AS/3501 laminae described in Example 7.5 is subjected to tensile uniaxial loading along the x-direc- tion. Using the maximum strain criterion, find the loads corresponding to first ply failure and subsequent ply failures; then plot the load-strain curve up to failure.